Sustainability Report Assurance
AA1000AS Licensed Assurance Provider
Assurance & Verification Services
Sustainability Report Assurance
External sustainability assurance is an independent, third-party evaluation of sustainability information disclosed in sustainability reports. Organisations obtain external assurance to strengthen the credibility, reliability, and transparency of sustainability reporting and climate disclosures.
High-quality external assurance provides confidence to Boards, investors, regulators, and other stakeholders that sustainability data is accurate, complete, and prepared in accordance with recognised international standards. Beyond validation, the assurance process strengthens governance, improves data management systems, and enhances accountability, supporting continuous improvement in sustainability performance.
Benefits of Assurance
Independent sustainability assurance delivers clear strategic and operational value. It enhances the credibility of sustainability reporting, improves the accuracy and reliability of disclosed data, reduces regulatory and reputational risk, strengthens Board and senior management engagement, improves reporting processes and internal controls, and enables clearer, more effective communication with stakeholders.
Our Assurance & Verification Services
Sustainability Report Assurance
CSRWorks provides independent third-party assurance of sustainability reports and sustainability-related disclosures. As a Licensed AA1000 Assurance Provider, our engagements assess both reported information and the effectiveness of the underlying systems, processes, and controls used to generate that information.
We support sustainability reporting aligned with the GRI Standards, Integrated Reporting Framework, ISSB-aligned sustainability and climate disclosures, European Sustainability Reporting Standards (ESRS) and other recognised international sustainability frameworks. Engagements may include pre-assurance or readiness reviews, followed by independent external assurance with a clearly defined scope and assurance level.
Greenhouse Gas (GHG) Verification
CSRWorks provides independent verification of greenhouse gas emissions in accordance with ISO 14064-3:2019. Our GHG verification services cover Scope 1, Scope 2, and Scope 3 emissions and include organisational and operational boundary assessments, review of methodologies and emission factors, and evaluation of calculation accuracy and data integrity. Where required, we offer applying the ISSA 5000 Standard.
Our work is aligned with the GHG Protocol and relevant regulatory and reporting requirements.
Assurance Standards We Apply
Depending on the engagement scope, reporting maturity, and jurisdictional context, CSRWorks applies internationally recognised assurance standards, including AA1000 Assurance Standard (AA1000AS v3), ISAE 3000 (Revised), ISSA 5000 – International Standard on Sustainability Assurance, and ISO 14064-3:2019 for greenhouse gas verification. ISSA 5000 is applied where appropriate, taking into account regulatory readiness, reporting scope, and stakeholder expectations.
Assurance Statement & Management Report
Each external assurance engagement concludes with a formal Assurance Statement, prepared in accordance with the applicable assurance standard and suitable for inclusion in sustainability reports or sustainability disclosures.
Clients also receive a detailed management report outlining key findings, identified gaps, and practical recommendations to strengthen sustainability reporting, data collection processes, governance arrangements, and management systems.
Our Assurance Methodology
Our assurance methodology goes beyond verifying reported figures. We assess governance and accountability structures, sustainability management systems, data collection and consolidation processes, internal controls, and the consistency between narrative disclosures and performance data.
This holistic approach ensures assurance outcomes deliver both credibility and meaningful, actionable improvement.
Our Assurance Team
CSRWorks’ assurance team has extensive international experience in sustainability reporting and assurance. Our assessors bring deep expertise across AA1000AS, ISAE 3000 (Revised), ISO 14060-3, ISSA 5000, GRI Standards, ISSB Standards, GHG Protocol, ESRS, climate and greenhouse gas reporting, sustainability ratings and benchmarks, and management systems. All assurance engagements are conducted with independence, professionalism, ethical rigour, and integrity.
Internal Review of Sustainability Reporting (Singapore)
Internal Review of sustainability reporting is a regulatory and governance requirement in Singapore and is commonly expected of SGX-listed companies.
CSRWorks provides Internal Review services for sustainability reporting in line with the International Standards for the Professional Practice of Internal Auditors issued by the Institute of Internal Auditors. These reviews support internal audit functions by providing an objective assessment of sustainability disclosures, internal controls, and reporting processes prior to publication or external assurance.
Internal Review helps organisations strengthen sustainability risk management, improve data reliability, enhance Board oversight, and reinforce accountability within sustainability management systems.
Benefits of Internal Review
• A systematic Internal Review of sustainability reports increase stakeholder confidence in the accuracy and reliability of the sustainability information disclosed.
• Internal Review ensures reasonable verification of performance data’s reliability, quality, and accuracy.
• It improves sustainability risk management and internal controls.
• It improves sustainability brand value, avoiding accusations of greenwashing.
• It improves Board engagement.
• It improves the sustainability management system, the reporting process and management accountability.
Why CSRWorks for Sustainability Assurance
CSRWorks is a specialist sustainability firm with a long-standing focus on assurance, standards, and governance. As a Licensed AA1000 Assurance Provider, we bring deep expertise in sustainability report assurance, greenhouse gas verification, and ISSA 5000-aligned engagements, supported by a strong understanding of how sustainability information is used by Boards, regulators, and external stakeholders.
Our assurance work is grounded in recognised international standards and reinforced by our role as a GRI Certified Training Partner, an IFRS-licensed ISSB Standards Training provider, IFRS-licensed Integrated Reporting Partner, and a Licensed AA1000 Training Provider. This standards-led approach enables us to deliver independent, regulator-ready assurance outcomes that go beyond compliance and support higher-quality sustainability reporting.
Contact Us
To learn more about our sustainability report assurance, greenhouse gas verification, or internal review services, please contact: consulting@csrworks.com
CSRWorks International Pte Ltd
Singapore
www.csrworks.com
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