2025 GHG Emissions Verification Statement (Australia)

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

• Stantec Australia Consulting Services

• Exclusions: emissions associated with refrigerant losses

  Types of GHGs: CO2, CH4, N2O

  GHG Emissions Statement:

  Metric	Verified GHG emissions1
  Scope 1	555
  Scope 2 (Location-Based)	1,257
  Scope 2 (Market-Based)	0
  Scope 3, Category 1: Purchased Goods and Services2	89
  Scope 3, Category 2: Capital Goods	Included in Purchased Goods and Services
  Scope 3, Category 3: Fuel- and Energy-Related Activities (Market-Based)3	113
  Scope 3, Category 4: Upstream Transportation and Distribution4	Not material
  Scope 3, Category 5: Waste Generated in Operations	132
  Scope 3, Category 6: Business Travel	814
  Scope 3, Category 7: Employee Commuting	2,362

  ‌1 Units are metric tons of CO2 equivalent‌

  ‌2 Includes acquisition of computers, furniture, mobile devices, miscellaneous equipment and paper

  3 Includes only transmission and distribution losses from electricity

  ‌4 Stantec considers Upstream Transportation and Distribution as not material and does not calculate nor report associated GHG emissions

  
  
  

  Metric	Verified GHG emissions1
  Scope 3, Category 8: Upstream Leased Assets5	Not material
  Scope 3 Total Emissions6	3,510
  Residual Emissions (sum of Scope 1 + Scope 2 (Market-based) + Scope 3 Emissions	4,065
  Carbon offsets purchased7	4,065

  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

  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.

  ‌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

  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 competence

  Apex 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 DATASETS

• GWP: Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR-6)

• United States Environmental Protection Agency, 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 DEFRA 2024 are also used in Scope 3 Business Travel)

• Australian Government, National Greenhouse Gas Accounts Factors, August 2024 and 2025 releases

• 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