Our public communications often include written or verbal “forward-looking statements” within the meaning of the US Private Securities Litigation Reform Act of 1995 “safe harbor” provisions and “forward-looking information” within the meaning of applicable Canadian securities laws (collectively, “forward-looking statements”). Forward-looking statements are disclosures regarding possible events, conditions, or results of operations that are based on assumptions about future economic conditions or courses of action and include financial outlook or future-oriented financial information.

Statements of this type are contained and incorporated by reference in this Annual Information Form (AIF) and include:

•The discussion of our goals, our key performance drivers, and our annual and long-term targets and expectations for our reportable segments, which can be found in our Management’s Discussion and Analysis (MD&A) section of our Annual Report for the year ended December 31, 2024 (incorporated by reference in this AIF and filed under our profile on SEDAR+ at sedarplus.ca and on EDGAR as an exhibit to our Form 40-F at sec.gov).

•Our beliefs about our risk management strategy and our ability to compete effectively which can be found in the Description of the Business section in this AIF.

Forward-looking statements may involve but are not limited to comments with respect to our objectives for 2025 and beyond, our strategies or future actions, our targets, our expectations for our financial condition or share price, or the results of or outlook for our operations.

The purpose of this information is to describe management’s expectations and targets by which we measure our success and to assist our shareholders in understanding our financial position as at and for the periods ended on the dates presented in this AIF. We caution readers that this information may not be appropriate for other purposes.

By their nature, forward-looking statements require us to make assumptions and are subject to inherent risks and uncertainties. There is a risk that predictions, forecasts, conclusions, projections, and other forward-looking statements will not prove to be accurate. We caution readers of this AIF not to place undue reliance on our forward-looking statements since a number of factors could cause actual future results, conditions, actions, or events to differ materially from the targets, expectations, estimates, or intentions expressed in these forward-looking statements.

The following factors, among others listed under the Outlook, Risk Factors, and Assumptions sections of our MD&A for the year ended December 31, 2024 (incorporated by reference in this AIF and filed under our profile on SEDAR+ at sedarplus.ca and on EDGAR as an exhibit to our Form 40-F at sec.gov), could cause our actual results to differ materially from those projected in our forward-looking statements:

•Effects of cybersecurity breaches

•Effects of workplace health and safety incidents

•Competition for skilled employees

•Geopolitical events, political and social instability

•Economic conditions, including inflation, interest rates, and currency fluctuations

•Fluctuations in demand for design services

•Competition in the geographic or business areas in which we operate

•Disruptions to public infrastructure spending

•New or changing laws and regulations in jurisdictions we operate

•Force majeure events, including extreme weather events

Many of these factors are beyond our control and have effects that are difficult to predict.

Assumptions about the performance of the Canadian, US, and global economies in 2025 and how this performance will affect our business are material factors that we consider when determining our forward-looking statements. These assumptions are discussed in the Outlook and Cautionary Note Regarding Forward-Looking Statements sections of our MD&A for the year ended December 31, 2024 (incorporated by reference in this AIF and filed under our profile on SEDAR+ at sedarplus.ca and on EDGAR as an exhibit to our Form 40-F at sec.gov).

For additional information regarding material and known risks and assumptions, see pages M-31 to M-41 and M-43 to M-45 of our MD&A. Our MD&A for the year ended December 31, 2024 is incorporated by reference in this AIF and filed on SEDAR+ at sedarplus.ca and on EDGAR as an exhibit to our Form 40-F at sec.gov.

We caution that various factors, including those discussed in our MD&A, could adversely affect our results. Investors and others should carefully consider these factors—as well as other uncertainties and potential events and the inherent uncertainty of forward-looking statements—when relying on these statements to make decisions about our Company.

The forward-looking statements contained in this AIF represent our expectations as at February 24, 2025 and are subject to change after that date. Except as may be required by law, we do not undertake to update any written or verbal forward-looking statement that we may make from time to time. Our current practice is to evaluate and, where we deem appropriate, provide updates to ranges of expected performance for 2025. However, subject to legal requirements, we may change this practice at any time at our sole discretion.

Stantec Inc. was incorporated under the Canada Business Corporations Act on March 23, 1984, as 131277 Canada Ltd. We have amended our Articles of Incorporation on several occasions to change share attributes, create and delete classes of shares, reorganize our outstanding share capital and split our common shares on a two-for-one basis, and change the minimum and maximum number of directors of our board.

Since incorporation, we have also amended our Articles of Incorporation several times to change our Company’s name:

•August 15, 1984 – 131277 Canada Ltd. changed to Stanley Engineering Group Inc.

•October 18, 1989 – Stanley Engineering Group Inc. changed to Stanley Technology Group Inc.

•March 30, 1994 – Stanley Technology Group Inc. amalgamated with 3013901 Canada Limited and continued as Stanley Technology Group Inc.

•October 28, 1998 – Stanley Technology Group Inc. changed to Stantec Inc.

Our head and principal office and our registered and records office are at Suite 300, 10220 – 103 Avenue NW, Edmonton, Alberta, Canada, T5J 0K4.

In this AIF, references to “Stantec” and the “Company” include (as the context may require) Stantec Inc. and all or some companies in which it has an interest. References to “our,” “us,” and “we” also refer to Stantec. All amounts in this AIF are in Canadian dollars unless otherwise noted.

The following chart lists, as at December 31, 2024, the intercorporate relationships among Stantec and its main subsidiaries; the percentage of voting and restricted shares of the subsidiaries owned, controlled, or directed by Stantec; and the governing jurisdiction of these subsidiaries. For our other subsidiaries not included in this list, the total assets and revenue owned, controlled, or directed by Stantec do not constitute more than 10%, individually, of the consolidated assets or consolidated revenues of Stantec as at December 31, 2024. These excluded subsidiaries also do not constitute more than 20%, in the aggregate, of the consolidated assets or consolidated revenues of Stantec as at December 31, 2024.

n/a – not applicable

(1)In this AIF, “restricted shares” means non-voting shares in the capital stock of a subsidiary of the Company.

(2)Stantec has economic control over the relevant activities of these entities by means of contractual arrangements.

(3)Held by a structured entity (an entity designed so that voting or similar rights are not the dominant factor in deciding who controls the entity).

On January 1, 2025, Richard (Rick) A. Eng and Christopher (Chris) F. Lopez were appointed to Stantec’s board of directors and the Company's Audit and Risk Committee. Rick Eng was also appointed to the Corporate Governance and Compensation Committee, and Chris Lopez joined the Sustainability and Safety Committee of the board. Donald Lowry, who had served on Stantec's board of directors since May 2013, retired on January 31, 2025. During his tenure on the board, Mr. Lowry was a member of the Audit and Risk Committee and chaired Stantec's Sustainability and Safety Committee. Following Mr. Lowry's retirement from the board, Martin à Porta assumed the chair position on the Sustainability and Safety Committee.

On January 1, 2025, Susan Reisbord assumed the position of Stantec's chief operating officer - North America (COO - North America). Ms. Reisbord's appointment followed the retirement of Stuart Lerner who served as Stantec's COO - North America from January 1, 2020 until December 31, 2024. Ms. Reisbord joined Stantec with the acquisition of Cardno and led Stantec's Environmental Services business operating unit from June 1, 2022 until her appointment to the position of COO - North America.

In January 2025, as part of ordinary course succession planning, Gord Johnston, Stantec's president and chief executive officer, announced the appointment of Paul Alpern, Bjorn Morisbak, Kenna Houncaren, and Ryan Roberts to the Company's C-Suite. Mr. Alpern's appointment to the position of executive vice president and general counsel, and Mr. Morisbak's appointment to the position of executive vice president and chief corporate development officer took place on January 11, 2025. Kenna Houncaren will take on the role of Stantec's chief corporate services officer effective April 1, 2025. Ryan Roberts will assume the position of chief practice officer on April 1, 2025. Ms. Houncaren and Messrs. Alpern, Morisbak, and Roberts are existing employees of the Company who have led important functions within Stantec over several years. Steve Fleck, who occupied the office of chief practice and project officer since January 2018, will retire from the Company's C-Suite effective April 1, 2025.

Highlights of Stantec’s general development over the past three years are provided below.

In 2024, we completed the following acquisitions:

On June 27, 2024, Stantec amended its Second Amended and Restated Credit Agreement (SARCA) which the Company entered into on December 8, 2022. The SARCA is an unsecured senior revolving credit facility, structured

as a sustainability-linked loan, in the maximum amount of $800 million and an unsecured senior term loan of $310 million in two tranches. The June 27, 2024 amendment changed certain terms and conditions of the SARCA, including extending the maturity dates from December 8, 2027 to June 27, 2029, and extending the term of the $150 million tranche from December 8, 2025, to June 27, 2027, and the term of the $160 million tranche from December 8, 2027, to June 27, 2029.

On June 28, 2024, Stantec entered into an unsecured bilateral term facility of $100 million with Desjardins Capital Markets (Bilateral Credit Facility). The Bilateral Credit Facility matures on June 28, 2025. The proceeds of the Bilateral Credit Facility were used to repay a portion of existing indebtedness on the Company's revolving credit facility.

Early in 2024, Stantec announced the planned retirement of Theresa B. Y. Jang, executive vice president and chief financial officer. Following an extensive search and evaluation of highly qualified internal and external candidates, on July 2, 2024, Stantec announced Vito Culmone as Stantec's next executive vice president and chief financial officer. Mr. Culmone formally became the chief financial officer of Stantec on September 3, 2024. Prior to joining Stantec, Mr. Culmone served as chief financial officer of MDA Space Ltd. Over the years, Mr. Culmone served as executive vice president and chief financial officer of Element Fleet Management Corp., Shaw Communications Inc., and WestJet Airlines Ltd. which amounts to over 35 years of financial leadership experience across a number of industries.

Patricia D. Galloway, who joined Stantec's board of directors in 2020, passed away on September 26, 2024. Dr. Galloway served on the Company's Corporate Governance and Compensation and Sustainability and Safety committees.

On December 11, 2024, Stantec announced the renewal of its Normal Course Issuer Bid (2024 NCIB). Pursuant to the Company's Notice of Intention to Make a Normal Course Issuer Bid approved by the Toronto Stock Exchange (TSX), Stantec may purchase up to 2,281,339 Shares, representing approximately 2% of Stantec’s 114,066,995 issued and outstanding common shares as of December 2, 2024. Purchases were permitted to commence on December 13, 2024, and will terminate no later than December 12, 2025. Except for block purchases permitted by the TSX, the number of shares purchased per day will not exceed 64,993 or approximately 25% of the average daily trading volume for the six full calendar months prior to November 30, 2024.

In connection with the 2024 NCIB, Stantec also entered into an automatic share purchase plan (ASPP) with a designated broker to purchase its common shares under the NCIB at times when Stantec cannot be active in the market due to applicable regulatory restrictions or internal trading blackout periods.

No shares have been repurchased in 2024 as Stantec has focused on its growth strategy, with the acquisitions of ZETCON Ingenieure GmbH, Morrison Hershfield Group Inc., and Hydrock Holdings Limited, all completed in early 2024.

On December 19, 2024, and upon expiry of the 2022 Base Shelf Prospectus (as defined further in this AIF), Stantec filed a Shelf Prospectus qualifying the distribution by the Company of common shares, preferred shares, debt securities, warrants, subscription receipts, units, or any combination of such securities in one or more transactions during the 25-month period from the date of the Prospectus. For the filing of the Shelf Prospectus, Stantec relied on Blanket Order 44-501 Exemption from Certain Prospectus Requirements for Well-known Seasoned Issuers of the Alberta Securities Commission and each of the comparable exemption orders issued by other provincial and territorial securities regulators in Canada.

In 2023, we acquired the following firm:

On March 1, 2023, Celina J. Wang Doka was appointed to Stantec’s board of directors, and on May 11, 2023, Angeline G. Chen was elected to the board of directors at the Company's annual general meeting of shareholders.

On June 16, 2023, Stantec entered into an unsecured bilateral term facility of $100 million with National Bank of Canada (NBC Bilateral Credit Facility). The proceeds of the NBC Bilateral Credit Facility, which matured on June 17, 2024, were used to repay a portion of existing indebtedness on the Company's revolving credit facility.

On June 27, 2023, Stantec closed a private placement offering of $250 million in aggregate principal of senior unsecured notes due June 27, 2030. The notes bear an interest rate of 5.393% per annum and were priced at par. Stantec used the net proceeds of this offering to repay a portion of existing indebtedness and for general corporate purposes.

For more information about Stantec’s senior unsecured notes, please refer to the Description of Capital Structure section of this AIF.

On November 29, 2023, Stantec closed a bought deal public offering of common shares (the Equity Offering). Pursuant to the Equity Offering, Stantec issued 3,108,450 common shares (the Shares) from treasury, including 405,450 Shares issued in connection with the exercise, in full, of the over-allotment option granted to a syndicate of underwriters. Shares were offered at a price of $92.50 per Share - for total gross proceeds of $287,531,625. The Shares were offered in all provinces and territories of Canada by way of a prospectus supplement to the base shelf prospectus (the Shelf Prospectus) filed by Stantec on November 18, 2022. In the United States, the Shares were offered by way of private placement.

Stantec used the net proceeds of the Equity Offering to repay balances outstanding on its revolving credit facility to create additional capacity to fund acquisitions and growth initiatives, as well as for general corporate purposes.

On December 5, 2023, Stantec released the highlights of the Company's 2024 - 2026 Strategic Plan, including the Company's three-year financial targets and guidance for 2024. To formulate its 2024 - 2026 Strategic Plan, Stantec identified key global trends to drive Stantec's organic growth: Climate Solutions, Communities and Infrastructure of the Future, and Future Technology. As part of its 2024 - 2026 Strategic Plan, Stantec also confirmed its disciplined approach to growth through strategic, accretive acquisitions.

On December 11, 2023, Stantec announced the renewal of its Normal Course Issuer Bid (2023 NCIB). Pursuant to the Company's Notice of Intention to Make a Normal Course Issuer Bid approved by the TSX, Stantec was permitted to purchase up to 2,281,339 Shares, representing approximately 2% of Stantec’s 114,066,995 issued and outstanding common shares as of December 1, 2023. Purchases were permitted to commence on December 13, 2023, and terminated on December 12, 2024. During 2023, 129,036 common shares were repurchased for cancellation at a weighted average price of $77.25 per share.

In 2022, we acquired the following firms:

Richard C. Bradeen, who joined Stantec's board of directors in 2018, passed away on December 27, 2022. Mr. Bradeen served on the Company's Audit and Risk and Corporate Governance and Compensation Committees.

On January 1, 2022, John Take was appointed to the position of Stantec’s chief business officer. On February 23, 2022, Asifa Samji was appointed to the position of the Company's chief human resources officer. Effective July 1, 2022, Mr. Take's title was changed to chief growth & innovation officer.

On November 14, 2022, Stantec announced the renewal of its Normal Course Issuer Bid (2022 NCIB). Pursuant to the Company's Notice of Intention to Make a Normal Course Issuer Bid approved by the TSX, Stantec was permitted to purchase up to 5,538,309 common shares, representing approximately 5% of Stantec’s 110,766,187 issued and outstanding common shares as of November 2, 2022. Purchases were permitted to commence on November 16, 2022, and terminated on November 15, 2023. During 2022, 1,085,676 common shares were repurchased for cancellation at a weighted average price of $60.16 per share.

On November 18, 2022, Stantec filed a Shelf Prospectus (2022 Base Shelf Prospectus) qualifying the distribution by the Company of common shares, preferred shares, debt securities, warrants, subscription receipts, units, or any combination of such securities in one or more transactions during the 25-month period from the date of the Prospectus. The 2022 Base Shelf Prospectus expired in December 2024.

Stantec's SARCA (as previously defined) was put in place on December 8, 2022. The SARCA is an unsecured senior revolving credit facility, structured as a sustainability-linked loan, with a syndicate of lenders and Canadian Imperial Bank of Commerce acting as administrative agent, sole lead arranger, and sole bookrunner. The SARCA is an amendment and restatement of Stantec's Amended and Restated Credit Agreement dated June 27, 2018, as amended by (i) Amending Agreement No. 1 dated July 19, 2019 and (ii) Amending Agreement No. 2 dated October 29, 2021, which is an amendment and restatement of a credit agreement dated May 6, 2016, pursuant to which the syndicate of lenders agreed to provide certain credit facilities to the Company. The SARCA consolidated

the previous amendments and implemented technical changes relating to the London Interbank Offered Rate (LIBOR) and Canadian Dollar Offered Rate (CDOR) transitions. The SARCA also amended the credit facilities by extending the maturity date of the $800 million revolving credit facility and the $160 million term loan tranche to December 8, 2027 and extending the maturity date of the $150 million term loan tranche to December 8, 2025. The SARCA was further amended on June 27, 2024, as described earlier in this AIF.

Stantec is a global design and delivery leader in sustainable engineering, architecture, and environmental consulting. Stantec's professionals deliver the expertise, technology, and innovation communities need to manage aging infrastructure, demographic and population changes, and energy transition. The diverse perspectives of our partners and interested parties help us to address such issues as climate change and digital transformation, and design resilient communities and infrastructure.

Stantec offers services through five business operating units (BOUs):

•Infrastructure – Evaluating, planning, and designing infrastructure solutions for transportation, community development, and urban spaces that are resilient and community friendly.

•Environmental Services – Providing a wide array of permitting, conservation, ecosystem restoration, health sciences and environmental, social, and governance (ESG) strategy services to preserve and minimize impacts to environmental, cultural, and social resources.

•Water – Designing solutions to provide resilience and improve health and quality of life through clean, safe water. We support the needs of communities and industry throughout the water lifecycle with tailored solutions for sustainable water resources, planning, management, and infrastructure.

•Buildings – Delivering integrated architecture, engineering, interior design, and planning solutions that draw upon our expertise to create lower-carbon innovations and strengthen communities through the power of design.

•Energy & Resources – Providing safe and sustainable solutions for the world’s energy and resource needs and supporting the energy transition with a growing focus on renewable sources.

The key components of our business model are:

•Geographic diversification. We do business in three regional operating units—Canada, the United States, and Global—offering similar services across all regions. This diversity allows us to cultivate close client relationships at the local level while offering the expertise of our global team.

•Service diversification. We offer services in various sectors across the project life cycle through five BOUs: Infrastructure, Environmental Services, Water, Buildings, and Energy & Resources.

•Design focus. We serve the design phase of infrastructure, water, buildings, and energy & resources projects, which offers higher margin opportunities and more controllable risk than integrated engineering and construction firms.

•Life-cycle solutions. We provide professional services in all phases of the project life cycle: planning, design, construction administration, commissioning, maintenance, decommissioning, and remediation.

Our diverse business model allows us to adapt to changes in market conditions by offsetting decreased demand for services in one BOU or geographic location with increased demand in another. We believe this strategy helps us mitigate risk while we continue to increase our revenue and earnings. Our first and fourth quarters generally have the lowest revenue generation and project activity because of holidays and weather conditions in the northern hemisphere, but our diverse business model allows us to adapt to these slowdowns.

Stantec's chief executive officer assesses our Company’s performance based on financial and strategically significant non-financial information available from our reporting segments.

Our reportable segments (in accordance with IFRS Accounting Standards) are based on the regional geographic areas in which we operate. The Company has three operating and reportable segments for its Consulting Services: Canada, United States, and Global.

The following table illustrates the breakdown of gross revenue for our reportable segments in 2023 and 2024.

For additional information regarding our business model, see page M-2 of our MD&A for the year ended December 31, 2024 (incorporated by reference in this AIF and filed on SEDAR+ at sedarplus.ca and on EDGAR as an exhibit to our Form 40-F at sec.gov).

Our Innovation Office combines proven ideas with curiosity, creativity, and the application of advanced technology to develop new services, products, and business lines that help our clients and communities with their most difficult challenges.

Innovation at Stantec exists and is encouraged across the entire organization. Stantec employees can share ideas through an online portal managed by our Innovation Office. We support promising ideas with technical expertise, coaching, and progressive levels of funding. Throughout the process, ideas with a digital component are supported by experts who are leading our digital transformation efforts. Our goals in this space are to identify current and future market needs and to create services, products, and tools that enable Stantec to continue to support our clients' evolving demands and, at the same time, improve the efficiency of our delivery, increase margins and open new revenue opportunities for our Company. Through the creation of new direct-to-market businesses, the establishment of Stantec.io, investments in emerging technology companies, and partnerships with known industry leaders, we are striving to put these solutions into the hands of our communities.

On that front, we conduct innovative research and development in a broad range of fields, such as infrastructure evaluation, planning and management systems, augmented and virtual reality, data management, artificial intelligence and machine learning applications, remote sensing and parametric and automated design efforts to find better ways to apply advanced technologies to proven science, engineering, and architecture practices so that Stantec can continue to effectively support our clients. With a history of working across all forms of infrastructure and the environment, we connect our subject matter experts with strong digital capabilities to offer solutions that make a difference in the world around us.

Our professional services cover all phases of the project life cycle: planning, design, construction administration, commissioning, operations and maintenance, decommissioning, and remediation. In all these areas, we compete with other large multinational professional services firms, as well as diversified (contracting/consulting) firms through to local, smaller and specialist providers. On any given project, the type and number of competitors vary, dependent on factors including scale of project, geographic location, end-markets/sectors, commercial and contractual terms and risks, technical qualifications and expertise, and any client-led restrictions. Global mega-trends are driving increased demand in our end-markets especially in climate solutions, communities and infrastructure of the future, and future technology. Given the expanding demand for the services we provide, we may see additional competitors emerge and likely some convergence of service offerings in the market.

We believe that we are well positioned to compete in our growing markets due to our client-centric framework with four value creators: excellence, innovation, people, and growth. We distinguish ourselves from our peers through our collaborative socio-technical approaches to sustainability, innovation, and operational efficiency actions, alongside our strategic initiatives aligned to long-term global dynamics. Our people and how we collaborate across our businesses and geographies sets us apart. Our successful track record of acquiring and integrating firms also provides us with a competitive advantage.

Stantec serves clients in private and public sectors by providing knowledge-based solutions through value-added professional consulting services in engineering, architecture, interior design, landscape architecture, surveying, environmental sciences, project management, program management, and project economics. Our focus is on the higher-margin, lower-risk design phase of buildings, energy, infrastructure, and water projects, as well as science and consultancy work in environmental sciences. We offer a range of pricing structures to our clients but usually provide our services based on a fixed or variable-fee contract (with a ceiling) or a time-and-material contract (without a stated ceiling). Most assignments are awarded to us because of our expertise and client relationships; others are obtained through a competitive bidding process.

Through our service diversification and offering professional services for all phases of the project life cycle, Stantec aims to establish ongoing relationships with clients to produce repeat business. We work on tens of thousands of projects for thousands of clients in hundreds of locations, thereby ensuring that we do not rely predominantly on a few large projects for our revenue.

As of December 31, 2024, we had approximately 32,000 employees, including professionals, technologists and technicians, and support personnel. The distribution of employees among Stantec's reportable segments was approximately 9,400 employees for our Canadian operations, 12,000 for our United States operations, and 10,600 for our Global operations.

We are a people-first organization, always seeking talented and skilled professionals for all our specialized services. As we operate in a competitive industry where turnover costs are high and long-term relationships are key, we work hard to recruit and retain the best people. We use various recruitment strategies to address staffing needs: an employee referral bonus program, website job postings, career fairs, and student programs, and we have opportunities to transfer staff to other office locations.

The Social section of this AIF and our annual Sustainability Report contain additional information on the steps we take to attract, support, motivate, and develop world-class talent and to build an inspiring and inclusive work environment for our staff.

Stantec’s Sustainability Program is built on the premise that positive economic results are enabled when we effectively manage our ESG concerns across our value chain. We actively participate in the United Nations (UN) Global Compact, follow recognized international ESG frameworks, and implement ESG practices in our operations and for our clients.

Our Sustainability Policy and programs guide our actions with our success recognized by third parties including Corporate Knights, which named Stantec in the top ten of their 2025 Global 100 Most Sustainable Corporations in the World, and number one in Stantec's industry peer group. We also consistently score high with investor-driven rating systems including MSCI ESG Ratings, LSEG ESG, ISS ESG Corporate Rating, and Sustainalytics.

Responsibility for our sustainability performance sits with our Executive ESG Committee - chaired by our chief financial officer - with the Sustainability and Safety Committee of the board providing additional oversight, leadership, and stewardship. To accelerate ESG performance and hold ourselves accountable, we have a sustainability pay link and sustainability-linked loan.

Please see the MD&A portion of the Annual Report for information regarding our climate change risks and opportunities.

ESG highlights are outlined below.

Stantec manages, monitors, and improves our environmental performance with an ISO 14001:2015-certified Environmental Management System. This management system sets environmental objectives and monitors and measures environmental targets, regulatory compliance, orders and citations, and improvement plans. We have near-term, 1.5°C science-based emissions targets approved by Science-Based Target initiative (SBTi). Stantec is operationally carbon neutral (by balancing residual emissions with the purchase of carbon offsets) as an interim step in our journey to net zero. We are consistently recognized as climate leaders by CDP.

All Stantec's BOUs and geographies provide environment-focused services to our clients. Whether we are providing climate change mitigation services, designing energy-efficient buildings, protecting biodiversity, restoring ecosystems, developing new ways to conserve water, or promoting renewable energy, our commitment to sustainability drives innovation, reduces risks, and provides attractive project life cycle return on investment.

Stantec is a professional services company that relies on the expertise of highly technical staff to provide engineering, architectural, planning, and environmental science services. We work hard to hire the best in the industry and focus on managing, mentoring, and retaining our people. We offer a flexible and collaborative work environment, competitive employee benefits, and the opportunity to work on iconic projects.

Stantec manages, monitors, and improves our health and safety performance with an ISO 45001: 2018-certified Occupational Health and Safety Management System. To gauge the effectiveness of our programs, we track both lagging indicators (e.g., injury rates) and leading indicators (e.g., inspections, observations, hazard identifications).

For the communities where we work and live, we invest in initiatives that build capacity and support long-term positive change. We do this by contributing time, expertise, and money to the arts, education, the environment, and health and wellness. We purposely focus on maintaining respectful and successful relationships with Indigenous communities.

For clients, we consider the social impacts of decisions made when managing projects throughout their life cycle. We help clients understand the norms of local communities so that they address local priorities and build lasting positive relationships. We incorporate social equity and justice considerations into our projects and design to foster community well-being.

Stantec believes that good governance is essential to maintaining an effective corporate culture. By embracing ethical business practices, we demonstrate our Company values and, in turn, establish a competitive advantage in the global marketplace.

Our Code of Business Conduct sets global standards that employees are expected to follow in their day-to-day work. We are committed to preventing corruption and anti-trust behaviors, and employees are prohibited from using Company funds for political contributions. We have a Partner Code of Business Conduct program that passes our ESG expectations through our supply chain.

Stantec's global Integrated Management System provides a disciplined and accountable framework that monitors risks and hazards, reduces inefficiencies, maximizes Company resources, and directly supports the implementation of our strategy. The integrated system includes the Environmental Management System and Occupational Health and Safety Management System referenced above as well as a Quality Management System (ISO 9001: 2015-certified), an IT Service Management System (ISO 20000: 2018-1 certified), and an Information Security Management System (ISO 27001: 2022-certified).

Additional information about our board of directors, risk management, and strategic planning process can be found in Stantec’s 2024 Annual Report and Management Information Circular.

Our Global operations encompass our operations outside of North America. In 2024, Stantec remained active internationally; gross revenue from our Global operations was $1,720.9 million.

We perform work and have permanent offices in the United Kingdom, Europe, Australia, New Zealand, India, the Middle East, China, Taiwan, Türkiye, South and Central America, and the Caribbean.

All Stantec projects are reviewed in accordance with Stantec’s Project Management Framework, which includes following legal, financial, and technical processes, among other things. As well, each project is examined to ensure that any health, safety, security or geopolitical risks are acceptable. Each major project has an executive leadership sponsor and is formally reviewed.

For a review of the risks pertaining to our Company, please refer to our MD&A for the year ended December 31, 2024, pages M-31 to M-41 (incorporated by reference in this AIF and filed on SEDAR+ at sedarplus.ca and on EDGAR as an exhibit to our Form 40-F at sec.gov).

On February 15, 2012, Stantec’s board of directors approved our Dividend Policy and concurrently declared Stantec’s first quarterly dividend. Pursuant to this policy, the Company anticipates that it will declare a dividend to shareholders of record on the last business day of each quarter and pay it on or about the fifteenth day of the following month.

Since adopting our Dividend Policy, we have paid quarterly dividends on our common shares. Although the Company aims to declare and pay a dividend quarterly, our Dividend Policy is at the sole discretion of our board of directors and may vary depending on various factors, including prevailing economic and market conditions, the Company’s earnings, the financial requirements for the Company’s operations, the business strategy of the Company, the provisions of applicable law, and any other factors that our board of directors considers relevant. Additionally, Stantec is required to meet certain financial thresholds under its credit facilities; this may restrict Stantec’s ability to declare and pay dividends. Pursuant to our credit facilities, we are restricted from declaring or paying dividends where a default or event of default is continuing or would be caused by such declaration or payment. Therefore, the declaration and payment of dividends is not guaranteed. For full particulars of our credit facility covenants, reference should be made to our Second Amended and Restated Credit Agreement, a copy of which is accessible on SEDAR+ at sedarplus.ca.

The following table outlines cash dividends paid per common share in 2024, 2023, and 2022.

Our authorized share capital consists of an unlimited number of preferred shares, issuable in series, and an unlimited number of common shares. As at December 31, 2024, no preferred shares and 114,066,995 common shares were issued and outstanding.

In addition to share capital, Stantec has debt securities issued and outstanding. The attributes of Stantec’s senior unsecured notes are provided in this section of the AIF.

Preferred shares may be issued in one or more series. The board of directors determines the number of shares and the rights, privileges, restrictions, and conditions attaching to each series. The holders of the preferred shares as a class are not entitled to receive notice of or attend any shareholders’ meeting and are not entitled to vote at any shareholders’ meeting, except to approve amendments to the terms of the preferred shares as a class or as required by law.

Each series of preferred shares will rank pari passu with each of the other series of preferred shares with respect to the entitlement to dividends and distribution of assets in the event of the liquidation, dissolution, or winding up of Stantec. Preferred shares as a class rank ahead of common shares with respect to entitlement to dividends and distribution of assets in the event of the liquidation, dissolution, or winding up of Stantec.

The holders of common shares are entitled to receive, as and when declared by our board of directors, dividends in an amount and form that our board of directors may from time to time determine. Holders of common shares are entitled to receive notice of and to attend all shareholders’ meetings. They have one vote for each common share held at each meeting, unless the meeting is only for holders of another specified class or series of our shares who are entitled to vote separately as a class or series.

Common shares rank behind preferred shares with respect to entitlement to dividends and distribution of assets in the event of the liquidation, dissolution, or winding up of Stantec.

Under the terms and conditions of a Trust Indenture (Indenture) between Stantec and Computershare Trust Company of Canada dated October 8, 2020, the Company may issue senior unsecured notes (Notes). The aggregate principal amount of Notes which may be issued under the Indenture is unlimited. The Notes, issuable in one or more Series, rank equally and pari passu with each other and with the Notes of every other Series, regardless of their actual dates or terms of issue.

On October 8, 2020, Stantec issued a first series of Notes designated as 2.048% senior unsecured notes due October 8, 2027 (Series 1 Notes). The amount of Series 1 Notes issued under the First Supplemental Trust Indenture dated October 8, 2020 is $300 million. The Series 1 Notes bear interest from the date of issue at the rate of 2.048% per annum, payable in equal installments, semi-annually in arrears. The Series 1 Notes are redeemable at the Company’s option, in whole or in part, at the redemption price specified in the First Supplemental Trust Indenture.

On June 27, 2023, Stantec issued a second series of Notes designated as 5.393% senior unsecured notes due June 27, 2030 (Series 2 Notes). The amount of Series 2 Notes issued under the Second Supplemental Trust Indenture dated June 27, 2023, is $250 million. The Series 2 Notes bear interest from the date of issue at the rate of 5.393% per annum, payable in equal installments, semi-annually in arrears. The Series 2 Notes are redeemable at the Company's option, in whole at any time, or in part from time to time, at the redemption price specified in the Second Supplemental Trust Indenture.

For a complete description of the Notes, Series 1 Notes, and Series 2 Notes, please refer to the Indenture, the First Supplemental Trust Indenture, and the Second Supplemental Trust Indenture, copies of which are accessible on SEDAR+ at sedarplus.ca.

On December 23, 2024, DBRS Limited (Morningstar DBRS) confirmed Stantec's credit ratings as presented in the tables below. As of December 31, 2024, the assigned ratings remained unchanged.

The Morningstar DBRS issuer and senior debt rating scale provides an opinion on the risk of default; that is, the risk that an issuer will fail to satisfy its financial obligations in accordance with the terms under which an obligation has been issued. The rating scale ranges from “AAA” to “D” which represents the range from an issuer with the highest credit quality to one that has filed under any applicable bankruptcy, insolvency or winding up statute or there is a failure to satisfy an obligation after the exhaustion of grace periods. Ratings are based on quantitative and qualitative considerations relevant to the issuer. Stantec’s rating of BBB means an adequate credit quality, acceptable capacity for the payment of financial obligations, and possible vulnerability to future events.

All rating categories from AA to CCC contain the subcategories "(high)" and "(low)". The absence of either a "(high)" or "(low)" designation indicates the rating is in the middle of the category. The Morningstar DBRS rating trends provide guidance in respect of Morningstar DBRS's opinion regarding the outlook for the rating in question, with rating trends falling into one of three categories – ‘‘Positive’’, ‘‘Stable’’ or ‘‘Negative’’. The rating trend indicates the direction in which Morningstar DBRS considers the rating may move if present circumstances continue.

The credit ratings assigned to Stantec are not a recommendation to buy, hold, or sell our debt or securities. There is no assurance that any rating will remain in effect for any given period of time, and that any rating will not be revised or withdrawn entirely at any time by the credit rating organization, if in its judgement, circumstances warrant.

In 2023 and 2024, Stantec made payments of customary rating fees to Morningstar DBRS in connection with the Company's credit rating. In 2023, in addition to the payment of ordinary rating fees, Stantec paid to Morningstar DBRS an issuance fee in connection with the assignment of ratings to our long-term debt for purposes of the Series 2 Notes Offering completed June 27, 2023. No other payments were made to Morningstar DBRS in respect of any other services provided to Stantec during the last two years.

Our common shares are listed for trading on the TSX and New York Stock Exchange (NYSE) under the symbol “STN”.

The following table lists Stantec’s directors as of February 24, 2025, their place of residence and principal occupation:

(1)Mr. Ammerman is the chair of our board.

(2)Progress Federal Solutions, Inc., a wholly-owned subsidiary of Progress Software Corporation (a US public company), produces software for creating and deploying business applications focused in the US federal government market.

All Stantec directors are elected annually and hold office until the next annual shareholders’ meeting or until their earlier resignation. All directors have held the positions listed in the table above or other executive positions with the same or associated firms or organizations during the past five years or more, except the following:

•Angeline Chen became General Counsel and Chief Administrative Officer at Progress Federal Solutions Inc. (formerly MarkLogic Corporation) in May 2023. Ms. Chen was Of Counsel of DLA Piper from May 2019 until May 2023.

•Rick Eng served as a Managing Partner, Infrastructure Group, of Brookfield Asset Management Ltd. from January 2015 until December 2023.

•Chris Lopez served as Chief Financial Officer of Hydro One Limited (Hydro One) from May 2019 until April 2023 and as Chief Financial and Regulatory Officer of Hydro One from April 2023 until June 2024.

•Celina Wang Doka is a retired partner at KPMG LLP where she served until September 2021.

The following lists the members of each committee of the board as at the date of this AIF:

•Audit and Risk Committee – Shelley Brown (chair), Angeline Chen, Rick Eng, Chris Lopez, and Celina Wang Doka

•Corporate Governance and Compensation Committee – Marie-Lucie Morin (chair), Martin à Porta, Angeline Chen, and Rick Eng

•Sustainability and Safety Committee – Martin à Porta (chair), Chris Lopez, Marie-Lucie Morin, and Celina Wang Doka

All of our directors, with the exception of Gordon Johnston, the Company's president and CEO, are "independent" as those terms are defined under applicable Canadian and US securities laws.

The following table lists the name, residency and position held by each executive officer of Stantec as of February 24, 2025, as well as his or her principal occupation in the five preceding years:

(1)Previous positions held at Stantec pertain to individuals’ positions held with Stantec Inc.’s operating subsidiaries.

(2)Mr. Culmone serves on the board of directors of EPCOR Utilities Inc.

As of December 31, 2024, the directors and officers of Stantec Inc. as a group beneficially owned, controlled, or directed, either directly or indirectly, 304,569 common shares, which is approximately 0.27% of our issued and outstanding common shares.

The responsibilities and duties of our Audit and Risk Committee are set out in the committee’s Terms of Reference (Mandate), attached as Appendix I to this AIF.

As of February 24, 2025, our Audit and Risk Committee members are Shelley Brown (chair), Angeline Chen, Rick Eng, Chris Lopez, and Celina Wang Doka.

The board of directors believes that the composition of this committee reflects an appropriate level of financial literacy and expertise and has determined that each committee member is “independent” and “financially literate” (as those terms are defined under applicable Canadian and US securities laws). As well, Shelley Brown, Rick Eng, Chris Lopez, and Celina Wang Doka are each an “audit committee financial expert” (as this term is defined in the rules and regulations of the US Securities and Exchange Commission [SEC]).

The following information describes each committee member’s education and experience that is relevant to the performance of his or her committee responsibilities.

Ms. Brown has more than 30 years of board experience serving on not-for-profit, association, and for-profit corporate boards, including Deloitte Canada, the Accounting Standards Board Oversight Council, and the University of Saskatchewan Board of Governors. During her distinguished 40-year career in accounting, Ms. Brown was a partner in two of the world’s largest professional services firms, and served as chair of the Canadian Institute of Chartered Accountants, and chaired the audit committee of NorZinc Ltd. until it was acquired by a private investment fund in December of 2022. Ms. Brown currently serves on the audit committee of Inter Pipeline Ltd. In 2024, Ms. Brown joined the board of directors of Sherritt International Corporation (Sherritt), a publicly traded company listed on the TSX. Ms. Brown is the chair of Sherritt's audit committee.

With nearly 40 years’ experience in accounting and expertise in strategic planning, good governance, finance, and risk management, Ms. Brown is a valuable asset to Stantec's Audit and Risk Committee.

Ms. Chen is a senior executive and corporate attorney in the software industry serving the U.S. federal market. She has nearly 30 years of corporate business experience across multiple industries including aerospace and defense, manufacturing, and industrials. Previously she served as Of Counsel at a major U.S. law firm where she advised clients on matters relating to U.S. national security, cyber, risk management, governance, regulatory compliance, and mergers and acquisitions. Throughout her professional career, she has been responsible for departmental and project budgets and planning, as well as reviewing financial statements and reports as both a member of senior management as well as on the board of private companies. She holds undergraduate and law degrees from Villanova University, an LL.M. in international and comparative law from Georgetown University Law Center, an MBA from the University of Maryland, and a Master of Science degree in Cybersecurity from Brown University.

Ms. Chen's legal expertise and extensive experience in regulatory compliance, risk management, and cybersecurity matters bring a valuable skill set to the operation of the Audit and Risk Committee.

Rick Eng has nearly 30 years of experience in investment banking, private equity and advisory roles, primarily focused on mergers and acquisitions, capital markets, and strategic business planning. He spent over 17 years at Brookfield Asset Management Ltd. (Brookfield), where he served as a Managing Partner in the Infrastructure Group from 2015 to 2023. Mr. Eng's responsibilities included leading new investments as well as overseeing and supporting portfolio companies in strategic growth and operational initiatives. Previously, Mr. Eng was Chief Investment Officer responsible for the underwriting of Brookfield's Transport investments globally. Prior to moving into Brookfield's Infrastructure Group in 2015, Mr. Eng was a senior member of Brookfield's private equity group. From 2012 to

2015, he served as Chief Financial Officer of Ainsworth Lumber Co., Brookfield's portfolio company. Prior to joining Brookfield, Mr. Eng served as vice president in investment banking at National Bank Financial. Mr. Eng holds a

Bachelor of Arts degree (Economics and History) from Queen's University and is a Chartered Professional Accountant.

Mr. Eng's knowledge of capital markets, expertise in mergers and acquisitions, and experience in supporting strategic growth add useful competencies to Stantec's Audit and Risk Committee.

Chris Lopez has nearly 30 years of industry experience in the utility, power generation, and mining sectors in Canada, United States, Mexico, Australia, and New Zealand. Mr. Lopez held various senior leadership positions with Hydro One Limited (Hydro One), an electricity transmission and distribution company, including as Chief Financial and Regulatory Officer and as Chief Financial Officer. Prior to Hydro One, Mr. Lopez served as Vice President, Corporate Planning and Mergers & Acquisitions at TransAlta Corporation, a company that operates and develops electrical generation assets in Canada, the United States and Australia. Mr. Lopez currently serves on the board of directors of Algonquin Power & Utilities Corp.(Algonquin), an international generation, transmission, and distribution utility company listed on the NYSE and serves on the audit and risk committee of Algonquin. Mr. Lopez holds a Bachelor of Business degree from Edith Cowan University in Australia and is a Chartered Professional Accountant. He is a Graduate member of the Australian Institute of Company Directors and has completed the CFO Leadership Program at Harvard Business School.

Mr. Lopez's financial expertise, deep understanding of mergers and acquisitions, and leadership experience at publicly traded companies operating in various geographies are valuable assets for Stantec's Audit and Risk Committee.

Ms. Wang Doka is a retired audit partner of KPMG LLP where she provided accounting and assurance services for a wide variety of public and private clients, specializing in such industries as real estate, investment management, civil engineering, and title insurance, amongst others. She led KPMG’s Building, Construction and Real Estate practice in the firm’s Orange County office and served on KPMG’s Partnership Audit Committee. In addition to serving on the Audit and Risk Committee of Stantec, Ms. Wang Doka serves on the audit committee of F&G Annuities & Life, Inc., a publicly traded company on the NYSE. She holds a Bachelor of Arts degree in Business Economics from the University of California, Los Angeles.

With nearly 40 years of experience in accounting and auditing services, Ms. Wang Doka brings a strong technical understanding of accounting and financial reporting matters to the Company's Audit and Risk Committee.

The Audit and Risk Committee must preapprove the audit and non-audit services performed by the Company's independent auditor to ensure that the provision of those services does not impair the auditor’s independence. Unless a type of service to be provided by the independent auditor has received general preapproval, it will require specific preapproval by the committee. Proposed services that exceed preapproved cost levels will require specific preapproval by the committee.

The table below presents fees incurred by the Company for work performed by its external auditor, PricewaterhouseCoopers LLP (PwC), during the fiscal years ended December 31, 2024, and December 31, 2023.

(1)Audit fees: Audit services provided by PwC for the audit and review of Stantec’s financial statements or services normally provided by PwC in connection with statutory and regulatory filings or engagements, including quarterly reviews, accounting consultation, statutory audit of in-scope subsidiaries and international financial reporting standard consultation.

(2)Audit-related fees: These services can include attest services not required by statute or regulation and review engagements.

(3)Tax fees: Professional services rendered by PwC for tax compliance and consulting services.

(4)All other fees: Non-audit assurance fees and related services provided by PwC.

We have pending legal claims and suits both by and against us. These are typical of the industries we operate in. Where appropriate, these claims have been reported to our insurers and the insurers of our predecessors, who are in the process of adjusting or defending them. None are expected to involve damages that exceed 10% of Stantec’s current assets.

No penalties or sanctions have been imposed against us by a court relating to provincial and territorial securities legislation or by a securities regulatory authority. Nor have any other penalties or sanctions been imposed by a court or regulatory body against us that would likely be considered important to a reasonable investor in making an investment decision. We have not entered into any settlement agreements before a court relating to provincial and territorial securities legislation or with a securities regulatory authority.

To the best of our knowledge, none of the (i) directors or executive officers of the Company, (ii) shareholders of the Company that beneficially own, or control or direct, directly or indirectly, more than 10% of the Company's outstanding voting securities, or (iii) any associate or affiliate of persons referred to in (i) and (ii), has or has had any material interest, direct or indirect, in any transaction within the three most recently completed financial years or during the current financial year that has materially affected or is reasonably expected to materially affect the Company.

To the best of our knowledge, no director or officer of the Company has any existing or potential material conflicts of interest with the Company or any of its subsidiaries.

Computershare Trust Company of Canada is our transfer agent for our common shares listed on the TSX and NYSE at its offices in Calgary, Alberta; Toronto, Ontario; and Canton, Massachusetts.

Except for contracts entered into in the ordinary course of business, which includes contracts in relation to the acquisition of professional services firms, the material contracts entered into by the Company within the most recently completed financial year, or before the most recently completed financial year but still remaining in effect, are as follows:

1.On October 8, 2020, Stantec entered into a Trust Indenture with Computershare Trust Company of Canada to create senior unsecured notes.

2.On October 8, 2020, Stantec entered into a First Supplemental Trust Indenture with Computershare Trust Company of Canada to provide for the creation and issuance of 2.048% Series 1 Notes due October 8, 2027.

3.On December 8, 2022, Stantec entered into a Second Amended and Restated Credit Agreement among Stantec Inc., as borrower; Canadian Imperial Bank of Commerce, as administrative agent, sole lead arranger, and sole bookrunner; Canadian Imperial Bank of Commerce, Bank of America, N.A., Canada Branch and HSBC Bank Canada, as issuing banks; and certain other lenders with respect to the provision of certain credit facilities to Stantec Inc., which was subsequently amended on June 27, 2024. As a part of the amendment, Royal Bank of Canada became the successor of HSBC Bank Canada.

4.On June 27, 2023, Stantec entered into a Second Supplemental Trust Indenture with Computershare Trust Company of Canada to provide for the creation and issuance of 5.393% Series 2 Notes due June 27, 2030.

Copies of each of the above contracts are filed on SEDAR+ at sedarplus.ca.

The Company's independent registered public accounting firm is PricewaterhouseCoopers LLP, Chartered Professional Accountants, who have issued a Report of Independent Registered Public Accounting Firm dated February 24, 2025 in respect of the Company’s consolidated financial statements as at December 31, 2024 and December 31, 2023 and for each of the years ended December 31, 2024 and December 31, 2023, and on the effectiveness of the Company’s internal control over financial reporting as at December 31, 2024. PricewaterhouseCoopers LLP has advised that they are independent with respect to the Company within the meaning of the relevant rules and related interpretations prescribed by the relevant professional bodies in Canada, including the Rules of Professional Conduct of CPA Alberta and any applicable legislation or regulations, as well as the rules of the US Securities and Exchange Commission (SEC) and the Public Company Accounting Oversight Board (PCAOB) on auditor independence.

Additional financial information is provided in our financial statements and our MD&A for our most recently completed financial year. Additional information including directors’ and officers’ remuneration and indebtedness, the principal holders of our securities, and securities authorized for issuance under equity compensation plans is contained in Stantec's Management Information Circular for the Company's most recent annual meeting of shareholders.

A copy of this AIF, our latest Management Information Circular, the Annual Report (which includes our MD&A and Audited Consolidated Financial Statements for the year ended December 31, 2024), and the Company's Notice of Intention to Make a Normal Course Issuer Bid approved by the Toronto Stock Exchange regarding the 2024 NCIB may be obtained from our website at stantec.com or by mail on request from the Secretary at Suite 300, 10220 – 103 Avenue NW, Edmonton, Alberta, T5J 0K4. Additional information relating to our Company—including disclosure documents and any reports, statements, or other information that we file with Canadian provincial securities commissions or other similar regulatory authorities—is also available through SEDAR+ at sedarplus.ca and on EDGAR at sec.gov.

As a foreign private issuer listed on the NYSE, we are generally entitled to follow the Canadian requirements to the extent not contrary to US securities laws, including the rules of National Instrument 58-101 and National Policy 58-201, with respect to corporate governance practices. Pursuant to Section 303A.11 of the NYSE’s Listed Company Manual, we are required to identify any significant ways that our corporate governance practices differ from those followed by US domestic companies under the NYSE’s listing standards. These differences can be found on our website at stantec.com/about/corporate-governance and in our 2024 Management Information Circular (incorporated by reference in this AIF and filed under our profile on SEDAR+ at sedarplus.ca and furnished as an exhibit to a Form 6 - K dated March 27, 2024 on EDGAR at sec.gov).

The following are the Audit and Risk Committee’s Terms of Reference (Mandate) effective as of February 24, 2025.

A.Overview and Purpose

The Audit and Risk Committee is appointed by, and responsible to, the board of directors. The committee approves, monitors, evaluates, advises, and makes recommendations, in accordance with these terms of reference, on matters affecting the external and internal audits, risk management matters, the integrity of financial reporting, and the accounting control policies and practices of the Company. The involvement of the committee in overseeing the financial reporting process, including assessing the reasonableness of management’s accounting judgments and estimates and reviewing key filings with regulatory agencies, is an important element of the Company’s internal control over financial reporting. The committee has oversight responsibility for the performance of both the internal auditors and the external auditors. The committee also ensures the qualifications and independence of the external auditors. The committee has oversight of the Company’s compliance with legal and regulatory requirements.

It is not the duty of the committee to plan or conduct audits or to determine that the Company’s financial statements are complete, accurate, and in accordance with International Financial Reporting Standards.

B.Authority and Responsibilities

The Audit and Risk Committee shall

•Request such information and explanations in regard to the accounts of the Company as the committee may consider necessary and appropriate to carry out its duties and responsibilities.

•Consider any other matters which, in the opinion of the committee or at the request of the board, would assist the directors to meet their responsibilities.

•Provide reports and minutes of meetings to the board.

•Engage independent counsel and other advisors as may be deemed or considered necessary, and determine the fees of such counsel and advisors. Receive confirmation from management that the Company has provided for adequate funding for the payment of compensation to the independent counsel and other advisors.

C.Membership

The members of the committee shall be composed of a minimum of three independent directors, appointed by the board, all of whom must be financially literate as defined under the rules of the SEC and the New York Stock Exchange (NYSE) and applicable Canadian securities laws. At least one member shall have accounting or related financial management expertise and be an audit committee financial expert as defined in SEC regulations. For greater clarity, the board has adopted the definition of “independent director” as set out in Multilateral Instrument 52-110 of the Canadian Securities Administrators. The chair of the board of directors shall be an ex-officio member of the Audit and Risk Committee, in addition to the minimum number of required independent directors.

The chair of the committee shall be designated by the board.

Attendance by invitation at all or a portion of committee meetings is determined by the committee chair or its members and would normally include the chief financial officer of the Company, representatives of the external auditor, the internal auditor, and such other officers or support staff as may be deemed appropriate.

D.Financial Statements and Disclosures

1.Review and recommend to the board for approval the annual audited financial statements and Management Discussion and Analysis.

2.Review and recommend to the board for approval the following public disclosure documents:

a.The year-end news release on the earnings of the Company; and

b.Other regulatory filings of a financial nature.

3.Review and, if appropriate, approve and authorize the release of the quarterly unaudited financial statements, including Management’s Discussion and Analysis, the quarterly interim report to shareholders, and the quarterly news release on the earnings of the Company. However, in the event that there is a significant or extraordinary matter that, in the opinion of the committee, should be reviewed by the board before the release of such information, the matter shall be referred to the board for review.

4.Receive the quarterly report from the Disclosure Committee on the adequacy of disclosure with respect to material events in the Company’s financial statements, Management’s Discussion and Analysis, and earnings news releases.

5.Receive annually an evaluation from the internal auditor of the procedures that exist for the review of financial information (extracted or derived from the financial statements) that is publicly disclosed by the Company.

6.Review and recommend to the board for approval all annual financial statements, reports of a financial nature (other than quarterly unaudited financial statements), and the financial content of prospectuses or any other reports that require approval by the board prior to submission thereof to any regulatory authority.

7.Review and recommend for the board for approval the Audit and Risk Committee information required as part of the Annual Information Form and Management Information Circular.

8.Review with management on an annual basis, the Company’s obligations pursuant to guarantees (including those granted under the Surety Credit Facility) that have been issued and material obligations that have been entered into and the manner in which these guarantees and obligations have been, or should be, disclosed in the financial statements.

9.Review and assess, in conjunction with management and the external auditor, at least annually or on a quarterly basis where appropriate or required

a.The appropriateness of accounting policies and financial reporting practices used by the Company, including alternative treatments that are available for consideration

b.Any significant proposed changes in financial reporting and accounting policies and practices to be adopted by the Company

c.Any new or pending developments in accounting and reporting standards that may affect or impact the Company

d.Any off-balance sheet structures

e.The key estimates and judgments of management that may be material to the financial reporting of the Company

10.At least annually, request the external auditor to provide their views on the quality (not just the acceptability) of the Company’s annual and interim financial reporting. Such quality assessment should encompass judgments about the appropriateness, aggressiveness, or conservatism of estimates and elective accounting principles or methods and judgments about the clarity of disclosures.

11.Review any litigation, claim, or other contingency, including tax assessments, that could have a material effect upon the financial position or operating results of the Company and the manner in which these matters have been disclosed in the financial statements.

12.Review with management on a quarterly basis the indicators of impairment to the Company’s goodwill.

E.External Auditor

13.Assess the performance and consider the annual appointment of an external auditor for recommendation to the board for ultimate recommendation for appointment by the shareholders.

14.Review, approve, and execute the annual engagement letter with the external auditor, and ensure that there is a clear understanding between the board, the committee, the external auditor, and management that the external auditor reports directly to the shareholders and the board through the committee. The terms of the engagement letter or the annual audit plan should include, but not be limited to, the following:

a.Staffing

b.Objectives and scope of the external audit work

c.Materiality limits

d.Audit reports required

e.Areas of audit risk

f.Timetable

g.Proposed fees

15.Obtain and review a report from the external auditor at least annually regarding the auditor’s independence and the profession’s or audit firm’s requirements regarding audit partner rotation.

16.Approve, before the fact, the engagement of the external auditor for all non-audit services and the fees for such services, and consider the impact on the independence of the external audit work of fees for such non-audit services.

17.Review all fees paid to the external auditor for audit services and, if appropriate, recommend their approval to the board. Receive confirmation from management that the Company has provided for adequate funding for the payment of compensation to the external auditor.

18.Receive an annual certification from the external auditor that they participate in the public oversight program established by the Canadian Public Accountability Board (CPAB) and the standards of the US Public Company Accounting Oversight Board (PCAOB) and that they are in good standing with the CPAB and the PCAOB.

19.Review a report from the external auditors describing (a) the firm’s internal quality control procedures and (b) any material issues raised by the most recent internal quality control review or peer review of the firm or by any inquiry or investigation by governmental or professional authorities within the preceding five years regarding the audits carried out by the external auditor together with any steps taken to deal with any such issues.

20.Receive and resolve any disagreements between management and the external auditor regarding all aspects of the Company’s financial reporting.

21.Review with the external auditor the results of the annual audit examination including, but not limited to, the following:

a.Any difficulties encountered, or restrictions imposed by management, during the annual audit

b.Any significant accounting or financial reporting issues

c.The auditor’s evaluation of the Company’s internal controls over financial reporting and management’s evaluation thereon, including internal control deficiencies identified by the auditor that have not been previously reported to the committee

d.The auditor’s evaluation of the selection and application of accounting principles and estimates and the presentation of disclosures

e.The post-audit or management letter or other material written communications containing any findings or recommendations of the external auditor including management’s response thereto and the subsequent follow-up to any identified internal accounting control weaknesses

f.Any other matters which the external auditor should bring to the attention of the committee

22.Meet with the external auditor at every meeting of the committee or as requested by the auditor, without management representatives present, and meet with management, at least annually or as requested by management, without the external auditor present.

23.When there is to be a change in the external auditor, review all issues related to the change, including the information to be included in the notice of change of auditor called for under National Instrument 51-102 and the planned steps for an orderly transition.

24.Review and approve the Company’s hiring policies regarding employees and former employees of the present and former external auditors of the Company.

25.Receive comments from the external auditor on their assessment of the effectiveness of the committee’s oversight of internal control over financial reporting.

26.Conduct an annual review of the external auditor, with the intention of identifying potential areas for improvement for the audit firm, and to reach a final conclusion on whether the auditor should be reappointed or the audit put out for tender.

F.Internal Audit

27.Review the appointment or termination of the internal auditor.

28.Review and approve the internal audit charter periodically (at least every three years).

29.Review and approve the annual audit plan of the internal auditor (where applicable) and ensure that there is a clear understanding between the board, the committee, the internal auditor, and management that the internal auditor reports directly to the board through the committee. Receive confirmation from management that the Company has provided for adequate funding for the internal auditor. The terms of the audit plan should include, but not be limited to, the following:

a.Staffing

b.Objectives and scope of the internal audit work

c.Materiality limits

d.Audit reports required

e.Areas of audit risk

f.Timetable

g.Proposed budget

30.Review with the internal auditor the results of their audit examination, including, but not be limited to, the following:

a.Any difficulties encountered, or restrictions imposed by management, during the audit

b.Any significant accounting or financial reporting issues

c.The auditor’s evaluation of the Company’s system of internal accounting controls, procedures, and documentation

d.The internal audit reports or other material written communications containing any findings or recommendations of the internal auditor, including management’s response thereto and the subsequent follow-up to any identified internal accounting control weaknesses

e.Any other matters which the internal auditor should bring to the attention of the committee

31.Meet with the internal auditor at every meeting of the committee or as requested by the internal auditor, without management representatives present.

G.Internal Controls

32.Obtain reasonable assurance, through discussions with and reports from management, the external auditor, and the internal auditors, that the accounting systems are reliable, the system for preparation of financial data reported to the market is adequate and effective, and the system of internal controls is effectively designed and implemented.

33.Review management’s annual report on the effectiveness of internal controls and procedures, as well as quarterly and annual chief executive officer and chief financial officer certificates filed pursuant to securities regulations.

34.Receive reports from management and/or the internal auditor on all significant deficiencies and material weaknesses identified.

35.Review annually, or as required, the appropriateness of the system of internal controls and approval policies and practices concerning the expenses of the officers of the Company, including the use of its assets.

36.Review and approve, on a quarterly after-the-fact basis, the expense accounts of the board chair and of the chief executive officer of the Company.

H.Risk

37.Review at least annually with management

a.The Company’s method of identifying, evaluating, mitigating, and reporting on the principal risks inherent in the Company’s businesses and strategic directions

b.The systems, policies and practices applicable to the Company’s assessment, management, prevention and mitigation of risks (including strategic, operating, compliance, and reputation, as well as financial risks including but not limited to the foreign currency, liquidity and interest rate risk, the use of derivative instruments, counterparty credit exposure, litigation, and adequacy of tax provisions)

c.The Company’s risk appetite, risk tolerance, and risk retention philosophy, including the Company’s loss prevention policies and insurance programs and corporate liability protection programs for directors and officers, as well as disaster response and business continuity plans

d.The Company’s cybersecurity program and measures designed to ensure security of the Company’s information technology systems.

38.Receive an annual report from and review with management the status of the Company’s principal and emerging risks, as well as the related mitigation programs (the Enterprise Risk Management program). Receive quarterly updates from management on the Company’s Enterprise Risk Management program.

39.Review with management the disclosures of the Company’s risks and risk factors in the Company’s Annual Information Form, the Management’s Discussion and Analysis, and other regulatory filings.

40.Report to the board annually on its activities in connection with the risk oversight role referenced herein so that the board as a whole can fulfill its responsibilities for risk oversight.

41.Receive a risk assessment report from management following due diligence on acquisitions within North America, United Kingdom, Europe, Australia, and New Zealand (Core Markets) with an enterprise value of C$150 million or greater, all acquisitions outside Core Markets with an enterprise value of C$100 million or greater, and all acquisitions with atypical risks compared to our current service and business model; make such further inquiries as considered necessary; and report thereon to the board. The content of the risk assessment report will be developed by the committee in conjunction with management with appropriate case-by-case enhancements to reflect risk associated with each opportunity and will be reviewed annually by the committee.

42.Review and assess, in conjunction with management and the external auditor, at least annually or on a quarterly basis where appropriate or required, the impact of the Company’s capital structure on current and future profitability.

43.Review and recommend to the board of directors proposals requesting a grant of a guarantee issued by Stantec for an amount in excess of $50 million, prior to issuance.

44.Review and recommend to the board of directors proposals requesting a grant of a surety bond issued by Stantec or its subsidiaries for (a) an amount in excess of $50 million individually or (b) whereby virtue of the grant of such surety bond would put the aggregate value of all surety bonds issued and outstanding in excess of $500 million, prior to issuance.

45.Review and approve, if appropriate and as required, the decision to enter into swaps that are exempt from the requirements of sections 2(h)(1) and 2(h)(8) of the US Commodity Exchange Act and to exercise the end-user exception.

46.Review and approve, as required, any policies with respect to swaps, hedging activities, clearing, and the end-user exception.

I.Compliance/Fraud

47.Receive quarterly reports on the Company’s fraud risk assessment activities.

48.In accordance with the Company’s integrity practices, review and determine the disposition of any complaints or correspondence received under the Company’s Code of Business Conduct.

49.Discuss with management the Company’s policies and procedures designed to ensure an effective compliance and ethics program, including the Company’s Code of Business Conduct.

50.Discuss with management and the Company’s in-house legal counsel any legal matters that may have a material impact on the financial statements or the Company’s compliance requirements.

51.Review quarterly the compliance certificate of the chief financial officer.

J.Other

52.Review, as required, any claims of indemnification pursuant to the bylaws of the Company.

53.Receive at least annually a report from the chief financial officer regarding private aircraft use, including itinerary and passenger manifest.

54.Review and determine the disposition of any complaints received from shareholders or any regulatory body.

55.Conduct an annual assessment of the effectiveness of the committee and provide a report thereon to the board.

56.Review annually the terms of reference for the committee and recommend any required changes to the board.

K.Meetings

57.Regular meetings of the committee are held at least four times each year.

58.Meetings may be called by the committee chair or by a majority of the committee members, usually in consultation with management of the Company.

59.Meetings are chaired by the committee chair or, in the chair’s absence, by a member chosen from among the committee.

60.A quorum for the transaction of business at any meeting of the committee is a majority of the appointed members.

61.The secretary of the Company shall provide for the delivery of notices, agendas, and supporting materials to the committee members at least five days prior to the meeting except in unusual circumstances.

62.Meetings may be conducted with members present or by telephone or other communications facilities that permit all persons participating in the meeting to hear or communicate with each other.

63.A written resolution signed by all committee members entitled to vote on that resolution at a meeting of the committee is as valid as one passed at a committee meeting.

64.The secretary of the Company, or his or her designate, shall be the secretary for the committee and shall keep a record of minutes of all meetings of the committee.

65.Minutes of the meetings of the committee shall be distributed by the secretary of the Company to all members of the committee and shall be submitted for approval at the next regular meeting of the committee.

This Management's Discussion and Analysis (MD&A) of Stantec Inc.’s (Stantec or the Company) operations, financial position, and cash flows for the year ended December 31, 2024, dated February 24, 2025, should be read in conjunction with the Company’s 2024 audited consolidated financial statements and related notes for the year ended December 31, 2024. Our 2024 audited consolidated financial statements and related notes are prepared in accordance with IFRS Accounting Standards as issued by the International Accounting Standards Board. All amounts shown in this report are in Canadian dollars unless otherwise indicated.

Additional information regarding the Company, including our Annual Information Form, is available on SEDAR+ at sedarplus.ca and on EDGAR at sec.gov. Stantec's report pursuant to Canada's Modern Slavery Legislation (an Act to enact the Fighting Against Forced Labour and Child Labour in Supply Chains Act and to amend the Customs Tariff) is available on SEDAR+ at sedarplus.ca and available on the Company's website at stantec.com. This additional information is not incorporated by reference unless otherwise specified and should not be deemed to be made part of this MD&A.

Stantec trades on the TSX and the NYSE under the symbol STN. Visit us at stantec.com or find us on social media.

The Company reports its financial results in accordance with IFRS Accounting Standards. However, certain indicators used by the Company to analyze and evaluate its results are non-IFRS or other financial measures, including: adjusted earnings before interest, taxes, depreciation and amortization (EBITDA), adjusted net income, adjusted earnings per share (EPS), adjusted return on invested capital (ROIC), net debt to adjusted EBITDA, days sales outstanding (DSO), free cash flow, margin (percentage of net revenue), organic growth (retraction), acquisition growth, measures described as on a constant currency basis and the impact of foreign exchange or currency fluctuations, compound annual growth rate (CAGR), net debt, total capital managed, working capital, and current ratio, as well as measures and ratios calculated using these non-IFRS or other financial measures. These measures are categorized as non-IFRS financial measures and ratios, supplementary financial measures, or capital management measures and described in the Definitions of Non-IFRS and Other Financial Measures (Definitions) and Liquidity and Capital Resources sections of this MD&A and, where applicable, reconciliations from the non-IFRS measure to the most directly comparable measure calculated in accordance with IFRS Accounting Standards are provided (see the 2024 Financial Highlights, Financial Performance, Liquidity and Capital Resources, and Definitions sections of this MD&A).

These non-IFRS and other financial measures do not have a standardized meaning under IFRS Accounting Standards and, therefore, may not be comparable to similar measures presented by other issuers. Management believes that, in addition to conventional measures prepared in accordance with IFRS Accounting Standards, these non-IFRS and other financial measures provide useful information to investors to assist them in understanding components and trends in our financial results. These measures should not be considered in isolation or viewed as a substitute for the related financial information prepared in accordance with IFRS Accounting Standards.

Stantec is a global leader in sustainable engineering, architecture, and environmental consulting. Our professionals deliver the expertise, technology, and innovation communities need to manage aging infrastructure, demographic and population changes, the energy transition, and more. Our strategy is guided by our vision: the success of our clients, communities, and people worldwide is our greatest ambition. The diverse perspectives of our partners and interested parties drive us to think beyond what’s previously been done on critical issues like climate change, digital transformation, and future-proofing our cities and infrastructure.

At Stantec, community means everyone with an interest in the work that we do—from our project teams and industry colleagues to our clients and the people our work impacts. The Stantec community unites approximately 32,000 employees working in over 450 locations across 6 continents.

Key components of our business model are:

1.Geographic diversification. We conduct business in three regional operating units—Canada, the United States, and Global—offering similar services across all regions at the local level while offering the expertise of our global team.

2.Service diversification. We offer services in various sectors across the project life cycle through five business operating units (BOUs): Infrastructure, Water, Buildings, Environmental Services, and Energy & Resources.

3.Design focus. We serve the design phase of infrastructure, water, buildings, and energy & resources projects which offers higher margin opportunities and more controllable risk than integrated engineering and construction firms.

4.Life-cycle solutions. We provide professional services in all phases of the project life cycle: planning, design, construction administration, commissioning, maintenance, decommissioning, and remediation.

In the first year of our 2024-2026 Strategic Plan, we delivered record results achieving 15.8% growth in net revenue, 14.2% growth in earnings, and 23.5% growth in adjusted earnings.

Our commitment to collaboration and delivery of integrated services across diverse business units and geographies drives operational efficiency and supports business growth. In 2024, our net revenue reached a record of $5.9 billion, driven predominantly by 7.4% organic growth and 7.5% acquisition growth.

Each of our geographic regions delivered organic net revenue growth while continuing to focus on strong project execution and operational excellence, driving strong results for several key financial metrics including achieving a 16.7% adjusted EBITDA margin, $361.5 million in net income, $3.17 diluted earnings per share, and $4.42 adjusted diluted earnings per share.

The growth was a testament to the strength of our diversified business model and our ability to address long-term critical issues stemming from aging infrastructure, climate change, future technologies, advanced manufacturing, and resource security.

We continued to be disciplined in our capital allocation strategy by prioritizing the deployment of capital towards investments in strategic acquisitions, which aggregated to $672 million, and returned capital to shareholders through dividends of $96 million. We completed the acquisitions of ZETCON Engineering (ZETCON), Morrison Hershfield Group Inc. (Morrison Hershfield), and Hydrock Holdings Limited (Hydrock), which added 2,745 employees to our organization and expanded our North America and Global footprints with new and complementary services offerings.

We generated strong free cash flows and growth in adjusted EBITDA—which increased 29.1% and 18.0%, respectively—that resulted in a net debt to adjusted EBITDA ratio of 1.2, the lower end of our internal range, and provides additional capacity to fund future acquisition opportunities and growth initiatives.

Through our intentional approach to environmental, social, and governance matters, Stantec has solidified its position as a global leader. We are extremely proud of our accomplishments and the resulting industry accolades which include:

•Ranked first among our industry peers and eighth overall as one of Corporate Knights’ 2025 Global 100 Most Sustainable Corporations in the world;

•Named to Corporate Knights’ Best 50 Corporate Citizens in Canada for the 15th time;

•Recognized as a climate leader, receiving a CDP A- rating for the seventh year in a row;

•Included in the S&P Global Sustainability Yearbook for the third year in a row; and

•Placed first on Newsweek's 2025 list of Canada's Most Responsible Companies.

Stantec is committed to safety, ethics, and an inclusive work environment that offers opportunities for all our employees.

Our sustainability-linked loan (SLL) structure connects to our syndicated senior credit facilities and aligns the cost of borrowing with targets linked to Social and Environmental targets. In 2024, we recognized SLL savings and directed these interest savings to Indigenous-run non-profit organizations providing climate action in Canadian, United States, Australian, and New Zealand Indigenous communities.

Global trends continue to drive strong demand for our services. Our 2024-2026 Strategic Plan focuses on the unprecedented funding and urgency due to climate change impacts; re- imagining and creating new approaches for communities and infrastructure; and further embracing technology to drive efficiencies. Our marketing and business development growth programs, combined with our strong expertise and exceptional cross collaboration, position us well to take advantage of the organic growth ahead of us. We are confident that we have the right mix between our five Business Operating Units, and their work within multiple sub-sectors, to meet this demand and provide a high level of diversification for Stantec. This business mix and our growing geographic diversification also creates further resiliency within our operations.

Our industry continues to consolidate and provide robust acquisition opportunities to grow strategically in all of our key sectors and geographies. We remain committed to, and on track for, achieving in our disciplined manner the growth aspirations outlined in our 2024-2026 Strategic Plan.

Following is a list of acquisitions that contributed to revenue growth in our reportable segments and business operating units: