Sustainability Assurance & Due Diligence

Limited assurance provides a lower level of confidence than reasonable assurance and involves less extensive procedures. It results in a negative form conclusion: the assurer states that nothing has come to their attention to suggest the information is materially misstated. Reasonable assurance involves more rigorous testing and results in a positive form conclusion: the assurer confirms the information is fairly stated in all material respects. Organizations typically begin with limited assurance and progress towards reasonable assurance as their data quality and governance infrastructure matures.

Pre-assurance is a preparatory engagement in which an external provider evaluates an organization’s ESG data completeness, process robustness and methodological alignment with reporting standards ahead of a formal assurance engagement. It identifies and helps remedy data and process gaps that would otherwise create issues during formal assurance. Pre-assurance is particularly valuable for organizations embarking on their first assurance cycle or transitioning to a higher level of assurance.

Key considerations include the provider’s experience with the relevant reporting frameworks and assurance standards, sector-specific expertise, independence requirements, geographic coverage across the organization’s operating footprint, and the provider’s capacity to scale as assurance scope expands. Organizations subject to mandatory assurance under the CSRD or other regulatory frameworks should also ensure their chosen provider meets the independence and accreditation requirements specified by the relevant regulation. The Verdantix Green Quadrant: ESG & Sustainability Assurance Services 2024 provides a detailed benchmark of 14 leading providers.

Key regulations include the EU Corporate Sustainability Due Diligence Directive (CSDDD) – which requires large organizations to identify, assess and manage human rights and environmental impacts across their value chains – and the EU Deforestation Regulation (EUDR) – which requires organizations to demonstrate that products placed on the EU market have not contributed to deforestation or forest degradation. Organizations operating across multiple jurisdictions should also monitor emerging national due diligence legislation, as requirements continue to expand beyond the EU.

ESG due diligence in M&A and investment contexts involves identifying physical and transition climate risks, human rights exposures, environmental liabilities, and regulatory compliance gaps across acquisition targets and investment portfolios. This enables buyers and investors to quantify deal risk, negotiate appropriate protections, identify value creation opportunities and ensure post-transaction integration plans address material sustainability issues. Providers with combined legal, engineering and advisory capabilities are typically best placed to support complex cross-border transactions.