#1STN TSX NYSE Investor Presentation SOON S Stantec September 2022#2STN TSX NYSE La Trobe Student Accommodation Victoria, Australia Cautionary statement Certain statements contained in this presentation constitute forward-looking information and statements within the meaning of applicable securities law (collectively, "forward-looking statements"). Forward-looking statements in this presentation include, but are not limited to: our financial targets (including our annual net revenue growth, adjusted EBITDA, and net income targets; employee count; and ROIC target), our carbon reduction pledges (including our carbon neutrality and net-zero targets), our anticipated business and geographical mix, our expectations regarding economic and industry trends in the sectors and regions in which we operate, our acquisition strategy, our capital deployment strategy, and our overall growth strategy. These statements provide information about management's current expectations and plans relating to the future. Readers are cautioned that this information may not be appropriate for other purposes. Stantec does not undertake any obligations to publicly update or revise any forward-looking statements except as required by law. By their nature, forward-looking statements require us to make assumptions and are subject to inherent risks and uncertainties. Readers are cautioned 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. Risk factors include, but are not limited to, the impacts of the COVID-19 pandemic, the risk of an economic downturn, decreased spending in the private and/or public sectors, changing market conditions for Stantec's services, and the risk that Stantec fails to capitalize on its strategic initiatives. Investors and the public should carefully consider these factors, other uncertainties, and potential events, as well as the inherent uncertainty of forward-looking statements when relying on these statements to make decisions about our company. For more information about how other material risk factors could affect our results, please refer to the Risk Factor section in our 2021 Annual Report incorporated herein by reference, by visiting EDGAR on the SEC website at sec.gov or by visiting the CSA website at sedar.com or on Stantec's website at stantec.com. In determining our forward-looking statements, we consider material factors including assumptions about the performance of the Canadian, US, and global economies in 2022 and beyond and their effect on our business. Unless otherwise indicated, all amounts expressed in Canadian dollars. This presentation contains non-IFRS and other financial measures and forward-looking statements, including a discussion of our business targets, expectations, and outlook. We caution readers not to place undue reliance on our forward-looking statements since a number of factors could cause actual future results to differ materially from the targets and expectations expressed. Non-IFRS and other financial measures do not have a standardized meaning under IFRS, and therefore, may not be comparable to similar measures presented by other issuers. For a discussion of risk factors and non-IFRS measures and other financial measures, see our 2021 Annual Report available on SEDAR, EDGAR, and stantec.com. 2#33 STN TSX-NYSE A GLOBAL LEADER IN SUSTAINABILITY Global leader in sustainable engineering, design and environmental services Stantec TSX / NYSE STN Market Cap $7.0B1 EV $8.2B1 Employees 26,0001 Locations 6 continents 400+ offices 1. 2. 723 As of August 26, 2022 As of June 30, 2022 3. 2022 Corporate Knights Global 100 Energy & Resources 13% Infrastructure 28% Buildings 19% #1 ranked most sustainable engineering firm in the world³ $4B 2022 TTM Net Revenue2 Water 20% Environmental Services 20%#44 STN TSX NYSE PEOPLE GROWTH Our core values drive our achievements We Put People First World's Best Employers Forbes Corporate Knights Canada Best 50 Corporate Citizens Gender Equality Index Bloomberg Top Indigenous Workplace Top 50 Workplaces for Indigenous STEM Professionals We Do What Is Right EXCELLENCE INNOVATION 2022 Corporate Knights Global 100 Ranked #1 most sustainable corporation among peers Ranked among top 1% in the world on sustainable performance 1.5°C Validated our science-based target Sustainability-Linked Loan Linked to Bloomberg Gender-Equality Index We Are Better Together $60 million Committed to donations of $60M by 2030; $31 M donated since 2007 $200,000 Annual Equity & Diversity Scholarships 5,100+ We Are Driven to Achieve Climate Leader CDP A- Climate Change Score Prime ISS ESG Corporate Rating Low Risk Sustainalytics Partnered through our Community Engagement Program#5STN TSX-NYSE 5 LO Execution of our strategic plan driving strong results Adjusted EBITDA & Margin ($ millions & %) 15.9% 15.8% 15.7% 15.5% $637 $574 $579 $574 Adjusted Net Income ($ millions) $305 $270 $249 $225 Adjusted EPS ($ per share) $2.75 $2.42 $2.22 $2.02 2019 2020 2021 2022 TTM 1 2019 2020 2021 2022 TTM 2019 2020 2021 2022 TTM 1 1. As of June 30, 2022 Design with community in mind#6STN TSX-NYSE Well-positioned to capitalize on key economic imperatives 6 Imperatives Aging and overloaded infrastructure Climate change Re-shoring domestic production Challenges Water scarcity and quality Aging wastewater storage and reclamation facilities Transportation infrastructure Extreme weather patterns Energy transition: need for clean energy, sustainable buildings, zero emissions transportation Need for climate solutions Semiconductors Vaccine production Supply chain and food scarcity The Stantec Advantage Long history: providing Water solutions since 1954; >$1B in gross revenue in 2021 Stantec Institute for Water Technology & Policy Major infrastructure projects: from concept to design Climate Solutions: helping clients reduce environmental impacts through solutions and design Innovation Office: climate change, smart cities to digital communities and automation Industry Expertise: working with 5 of top 10 semiconductor manufacturers Logistics and fulfillment centres Urban agriculture / alternative sources of protein#7STN Why invest in Stantec? TSX-NYSE Strong Dividend Growth Global Leader in Sustainability Diverse Business Lines, Geographies, and Customers $0.58 $0.62 $0.72 $0.65 2019 2020 2021 20221 Significant Growth Disciplined Capital Allocation Strategy Record Backlog $5.8B $5.4B $5.1B $4.7B Delivering profitable performance for over 65 years Q3 Q4 Q1 Q2 2021 2021 2022 2022 1. Annualized at current rate of $0.18 per quarter and subject to Board approval 7#88 A GLOBAL LEADER IN SUSTAINABILITY STN TSX-NYSE WATER ENVIRONMENTAL INFRASTRUCTURE SERVICES BUILDINGS ENERGY & RESOURCES Business Operating Units - Overview#99 WATER STN TSX NYSE Stantec, in the Water business for 65+ years, recognized as a global leader We have delivered water solutions since 1954 We design water projects that improve the health and quality of life across communities We build resilience to natural disasters and climate change We help communities attain sustainable access to safe, affordable, and reliable drinking water and sanitation. $820M TTM Q2 2022 net revenue Q2 2022 YTD Net revenue By geography By sector ■ Water Treatment Conveyance ■ Water Resources ■ Wastewater Treatment ■ Stormwater ■ Enterprise Systems ■ United States ■ Canada ■ Global#1010 ENVIRONMENTAL SERVICES STN TSX NYSE Environmental Services has over 3,000 experts around the world Environmental Services provides a wide array of conservation, ecosystem restoration, and sustainability services. Collaborates with our other business operating units to preserve environmental and social resources. Performs permitting services that enable traditional development while minimizing environmental impacts. $768M TTM Q2 2022 net revenue Q2 2022 YTD Net revenue By geography By sector ■ Buildings ■ Oil & Gas ■ Water ■ Power & Dams ■Community Dev ■Transportation ■Mining ■ United States ■ Canada ■ Global#1111 INFRASTRUCTURE STN TSX-NYSE Infrastructure is a leader in transport system design and community development $1.1B Stantec's Infrastructure group is at the forefront of integrating transport design and community development into the communities we serve. We design infrastructure to be accessible, sustainable, resilient, and people-friendly. Our team is focused on reducing the environmental and social impacts of major infrastructure builds that, historically, have been sited in lower income areas and contribute to societal inequity. TTM Q2 2022 net revenue Q2 2022 YTD Net revenue By geography By sector ■Roadways Community Dev ■ Transit & Rail ■Bridges ■ United States ■ Canada ■ Global#12BUILDINGS STN TSX-NYSE Buildings ranked #1 in Architecture and Engineering for the last 10 years¹ Stantec's Buildings group provides consulting and design services for built, natural, and organizational environments. We guide clients through a process that incorporates sustainable, resilient, and healthy building design. ARKET Stantec is a leader in net-zero design and adaptive re-use of built environments, both of which are essential to meet global emission reduction targets. 12 1. Building Design & Construction Giants 400 $770M TTM Q2 2022 net revenue Q2 2022 YTD Net revenue By geography By sector ■ Healthcare ■Commercial ■Civic ■ Education Industrial ■ Airports Workplace ■ United States ■ Canada ■ Global#1313 ENERGY & RESOURCES STN TSX-NYSE Energy & Resources plays a critical role in energy transition Stantec's Energy & Resources group delivers utility-scale and microgrid renewable energy generation engineering and design services. We design for increasingly severe weather events and remedy existing grid limitations. We have also worked on some of the largest renewable energy installations in the world By geography By sector $538M TTM Q2 2022 net revenue Q2 2022 YTD Net revenue ■ Power ■Mining ■ Oil & Gas ■Waterpower & Dams ■ United States ■ Canada ■Global#1414 A GLOBAL LEADER IN SUSTAINABILITY STN TSX NYSE Committed to sustainability#1515 A GLOBAL LEADER IN SUSTAINABILITY STN TSX NYSE Notes: A global leader in sustainable engineering & design Corporate Knights Global 100: #17 Ranked the most sustainable design and engineering firm in the world CDP (1) Score 2021 2020 2019 Carbon neutral for 2022 Net Zero A- A- A- 2030 emission targets validated by SBTi ISS ESG (2) Quality Score Corporate Knights Best 50 Corporate Citizens in Canada Ranked among the best Canadian companies focused on ESG for the 13th time E S G 1 1 1 1st globally to link metrics. to Bloomberg GEI Sustainability- Linked Loan 1st in Canada to direct interest savings to communities Sustainalytics (3) ESG Risk Rating Low (1) CDP Website - August 9, 2022 (2) ISS Sustainability Suite - August 1, 2022 (3) Sustainalytics website - August 9, 2022#166 16 A GLOBAL LEADER IN SUSTAINABILITY STN TSX-NYSE Stantec advances strategies for sustainability Focus on sustainability for our key stakeholders including employees, investors, clients and communities where we live GROSS REVENUE ALIGNED TO UN SUSTAINABLE DEVELOPMENT GOALS 2021 2020 2019 CLEAN WATER AND SANITATION $- $1,000 $2,000 Gross Revenue (CA$ millions) 53% 49% 45% 7 AFFORDABLE AND INDUSTRY, INNOVATION CLEAN ENERGY AND INFRASTRUCTURE 11 SUSTAINABLE CITIES AND COMMUNITIES 15 ON LAND LIFE Other ::::: TRANSPORT MMUNITIES & BUILDING VULNERABILITY GOAL SETTING ENERGY TRANSITION BENCHMARKING EMISSIONS GHG EMI MITIGATION CLIMATE SOLUTIONS CLIMATE ADAPTATION PLANNING ENGINEERED SOLUTIONS TY & RISK - MITIG R-ENERGY NEXUS MODELING ENGAGEMENT NATURE-BASED SOLUTIONS STAKEHOLDE#1717 A GLOBAL LEADER IN SUSTAINABILITY STN TSX-NYSE Governance A diverse board with exceptional backgrounds • . • • . • Certified Integrated Management System: Environmental Management (ISO 14001:2015) Occupational Health & Safety Management (ISO 45001:2018) Information Security System (ISO 27001:2013) Quality Management (ISO 9001:2015) IT Service Management System (ISO 20000-1:2018) Business Continuity Planning Pandemic Preparedness Internal Practice Audits Robust IT security processes and practices: Next-generation security systems Cybersecurity awareness training for employees Compliance with privacy laws including the General Data Protection Regulation (European Union) and Cyber Essentials Plus (United Kingdom) Board Composition and Experience Sustainability Governance Structure O Environmental and Social Factors 78% highly experienced 22% general experience Governance Factors 100% highly experienced Board Sustainability and Safety Committee Functional Service Teams Executive ESG Committee Vice President, Corporate Sustainability SDG Impact Leader Sustainability Services#1818 A GLOBAL LEADER IN SUSTAINABILITY STN TSX-NYSE Social leadership Community Engagement (CE) $60M by 2030 Committed to investing a further $30 million through our CE program, taking our total to $60 million since starting our CE program in 2007 5,600+ Global community partnerships in the history of our CE program $611K Grants for STEM in 2021 $800K+ Scholarships funded in 2021 $200K Annual Equity & Diversity Scholarship launched in 2021 Inclusion & Diversity We support I&D through partnerships to gain access to top talent from BIPOC communities, sponsoring scholarships and internships for underrepresented and underprivileged students, and through reviewing our internal practices to identify and remove bias. Named on the 2022 Bloomberg Gender Equality Index Participated in the UNGC Target Gender Equality Program and tracked progress against the Women's Empowerment Principles in alignment with SDG #5 Gender Equality Signatory to the UN Women Empowerment Principles since 2015 C-suite is 38% female and 25% are people of color Gender Pay Equity A review of our pay practices found that women have received higher average pay increases since 2018, and are being promoted at a higher rate, than men during the same period. 4% Base pay gap on a median compa ratio basis in North America Voluntary Turnover -3% lower than industry average Top 50 Workplaces for Indigenous STEM Professionals American Indian Science and Engineering Society The World's Top Female Friendly Companies 2021 Forbes America's Best Employers for Women 2021 Forbes Gender- Equality Index 2022 Bloomberg#1919 Q2 2022 STN TSX-NYSE Q2 2022 Financial Performance Parks and Facilities Yard Development Regina, Saskatchewan, Canada#20STN TSX-NYSE Solid Q2 2022 earnings Q2 2022 20 20 Net revenue Increased earnings KEY DRIVERS $1.1B 23% driven by: Adj EBITDA (1) Organic Net Revenue Growth (1) Aging and overloaded infrastructure $187M | 27% 9.4% Adj EBITDA Margin (1) Acquisition Growth (1) 16.7% 60bps 12.4% Adj Diluted EPS (1) Project Margin Climate change and sustainability Production capacity constraints and re-shoring domestic production $0.83 | 34% 54.0% (1) Adjusted EBITDA, adjusted EBITDA margin, adjusted diluted EPS, organic net revenue growth, and acquisition growth are non-IFRS and other financial measures (discussed in the Definitions section of Stantec's Q2 2022 Quarter Report)#21STN TSX-NYSE EXCELLENCE INNOVATION PEOPLE GROWTH Recent acquisitions driving synergistic revenue growth Three acquisitions in the United States support sustainability, climate and environmental solutions. Paleo's archeological expertise is in demand by the energy industry. Cardno increases our presence in Environmental Services 60%. Cox McLain provides us with environmental compliance and planning in Texas. Continued growth in Europe Driven by Values in the Netherlands helps public and private clients navigate the energy transition Barton Willmore in the UK strengthens our delivery expertise in master planning and urban design Three acquisitions in Australia enhance our exposure to this strong economy. GTA expands our presence in transportation advisory, planning, analytics, engineering, and technical design. Engenium enhances our exposure to Australia's most influential mining, resources, renewable energy and industrial infrastructure clients. Cardno doubles the size of Stantec's presence in Australia and provides us with the critical mass and diversity to accelerate our growth in this market. 21 ང་#22STN TSX-NYSE 2022 Outlook reaffirmed Strong trends back robust multi-year growth outlook Q2 2022 22 22 Targets 2022 Annual Range June 30, 2022 YTD Actuals Geography 2022 regional net revenue outlook Net revenue growth 18% to 22% 21.3% United States High single-digit organic growth Adjusted EBITDA as % of net revenue (1) 15.3% to 16.3% 15.6% Canada Low single-digit organic growth Adjusted net income as % of net revenue (1) At or above 7.5% 7.4% Adjusted ROIC(1) Global Above 10.5% (note) High single- to low-double digit organic growth 2022 Adjusted diluted EPS(1) expected to grow by 22% to 26% (1) Adjusted EBITDA, adjusted net income, adjusted ROIC, and adjusted diluted EPS are non-IFRS and other financial measures (discussed in the Definition section of our Q2 2022 MD&A). Note: Adjusted ROIC is calculated annually at the end of the year.#23STN TSX-NYSE 23 Gregory County Pumped Storage Iowa, United States Q&A