VERIFICATION OPINION DECLARATION GREENHOUSE GAS EMISSIONS To: The Interested Parties of Stantec Inc.
Apex Companies, LLC (Apex) was engaged to conduct an independent verification of the greenhouse gas (GHG) emissions reported by Stantec Inc. (Stantec) for the period stated below. This verification opinion declaration applies to the related information included within the scope of work described below.
The determination of the GHG emissions is the sole responsibility of Stantec. Stantec is responsible for the preparation and fair presentation of the GHG emissions statement in accordance with the criteria. Apex's sole responsibility was to provide independent verification on the accuracy of the GHG emissions reported, and on the underlying systems and processes used to collect, analyze and review the information. Apex is responsible for expressing an opinion of the GHG statement based on the verification.
Operational Control
Worldwide.
Exclusions: emissions associated with refrigerant losses
Types of GHGs: CO2, CH4, N2O
GHG Emissions Statement:Metric
Verified GHG emissions1
Year-over-year changes in GHG emissions verified (2024 to 2025)
Scope 1
11,895
3% decrease
Scope 2 (Location-Based)
18,937
8% decrease
Scope 2 (Market-Based)
602
44% decrease
Scope 3, Category 1: Purchased Goods and Services2
17,047
15% decrease
Scope 3, Category 2: Capital Goods
Included in Purchased Goods and Services
Included in Purchased Goods and Services
Scope 3, Category 3: Fuel- and Energy-Related Activities (Market-Based)3
1,601
13% decrease
Scope 3, Category 4: Upstream Transportation and Distribution4
Not material
Not calculated
Scope 3, Category 5: Waste Generated in Operations
3,359
7% increase
1 Units are metric tons of CO2 equivalent
2 Includes acquisition of vehicles, computers, furniture, mobile devices, miscellaneous equipment, paper and native plant nursery
fertilizer
3 Includes only transmission and distribution losses from electricity and district heating
4 Stantec considers Upstream Transportation and Distribution as not material and does not calculate nor report associated GHG emissions
Metric
Verified GHG emissions1
Year-over-year changes in GHG emissions verified (2024 to 2025)
Scope 3, Category 6: Business Travel
21,825
10% decrease
Scope 3, Category 7: Employee Commuting
29,403
4% increase
Scope 3, Category 8: Upstream Leased Assets5
Not material
Not calculated
Scope 3 Total Emissions6
73,235
Not calculated
Residual Emissions (sum of Scope 1 + Scope 2 (Market-based) + Scope 3 Emissions
85,732
Not calculated
Carbon offsets purchased7
85,732
Not calculated
Data and information supporting the Scope 1 and Scope 2 emissions statement were generally historical in nature and in some cases estimated.
Data and information supporting the Scope 3 GHG emissions statement were in some cases estimated rather than historical in nature.
Period covered by GHG emissions verification:January 1, 2025 to December 31, 2025
Criteria against which verification was conducted:World Resources Institute (WRI)/World Business Council for Sustainable Development (WBCSD) Greenhouse Gas (GHG) Protocol Corporate Accounting and Reporting Standard (Scope 1 and 2)
World Resources Institute (WRI)/World Business Council for Sustainable Development (WBCSD) Greenhouse Gas Protocol Corporate Value Chain Accounting and Reporting Standard (Scope 3)
Reference Standard:ISO 14064-3: Greenhouse gases -- Part 3: Specification with guidance for the validation and verification of greenhouse gas statements
Level of Assurance and Qualifications:Limited
This verification used a materiality threshold of ±5% for aggregate errors in sampled data for each of the above indicators
5 Due to their Operational Control reporting boundary, Stantec reports emissions associated with their leased assets in Scope 1 and Scope 2
6 Verified Scope 3 emissions refer to emissions from Scope 3 categories 1, 2, 3, 4, 5, 6, 7 and 8
7 Carbon offsets purchases were reviewed by Apex for confirmation of proper certification and retirement against stated registries. Carbon offsets are a balance of residual emissions and do not factor into emission reductions
GHG Verification Methodology:Evidence-gathering procedures included but were not limited to:
Interviews with relevant personnel of Stantec;
Review of documentary evidence produced by Stantec;
Review of Stantec's data and information systems and methodology for collection, aggregation, analysis and review of information used to determine GHG emissions; and
Audit of sample of data used by Stantec to determine GHG emissions.
Verification Opinion:Based on the process and procedures conducted, there is no evidence that the GHG emissions statement shown above:
is not materially correct and is not a fair representation of the GHG emissions data and information; and
has not been prepared in accordance with the WRI/WBCSD GHG Protocol Corporate Accounting and Reporting Standard (Scope 1 and 2), and WRI/WBCSD Greenhouse Gas Protocol Corporate Value Chain Accounting and Reporting Standard (Scope 3).
It is our opinion that Stantec has established appropriate systems for the collection, aggregation and analysis of quantitative data for determination of these GHG emissions for the stated period and boundaries.
Statement of independence, impartiality and competenceApex is an independent professional services company that specializes in Health, Safety, Social and Environmental management services including assurance with over 30 years history in providing these services.
No member of the assurance team has a business relationship with Stantec, its Directors or Managers beyond that required of this assignment. We have conducted this verification independently, and there has been no conflict of interest.
Apex has implemented a Code of Ethics across the business to maintain high ethical standards among staff in their day-to-day business activities.
The verification team has extensive experience in conducting assurance over environmental, social, ethical and health and safety information, systems and processes, has over 20 years combined experience in this field and an excellent understanding of Apex's standard methodology for the verification of greenhouse gas emissions data.
Attestation:Megan O'Neil, Lead Assuror Trevor Donaghu, Technical Reviewer
ESG Program Manager ESG Director
Apex Companies, LLC Apex Companies, LLC
Atlanta, Georgia Pleasant Hill, California
April 16, 2026
This verification opinion declaration, including the opinion expressed herein, is provided to Stantec and is solely for the benefit of Stantec in accordance with the terms of our agreement. We consent to the release of this statement to the public or other organizations, but without accepting or assuming any responsibility or liability on our part to any other party who may have access to this statement.
APPENDIX A: GLOBAL WARMING POTENTIAL (GWP) AND EMISSION FACTOR DATASETSGWP: Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR-6)
International Energy Agency (IEA) Emission Factor Database (2023 data), 2025
United States Environmental Protection Agency (USEPA), Emissions & Generation Resource Integrated Database (eGRID) (2023 data), 2025
USEPA Emission Factor Hub, 2025
United Kingdom (UK) Department for Environment Food & Rural Affairs (DEFRA), UK Government GHG Conversion Factors for Company Reporting, June 10, 2025 (emissions factors from DEFRA 2021 and 2024 are also used in Scope 3 Business Travel)
Australian Government, National Greenhouse Gas Accounts Factors, August 2024 and 2025 releases
Environment Canada, National Inventory Report 1990-2023: Greenhouse Gas Sources and Sinks in Canada, Annex 13 - Electricity in Canada: Summary and Intensity Tables (2022 data), April 21, 2025
New Zealand Government, Measuring emissions: A guide for organisations: 2025 detailed guide
Association of Issuing Bodies (AIB) European Residual Mixes, August 26, 2025
Green-e® Residual Mix Emissions Rates (2022 Data), 2024
CDP Supply Chain Scope 3 Report (2024 release)
Open Comprehensive Environmental Data Archive (CEDA), 2025
Scope 3 methodologies and emission factors in the Watershed platform