What Is an ESG Consultant? Strategy, Reporting, Ratings, and How to Hire One in 2026

Example Projects

1. ESG Strategy and Materiality Assessment
   An ESG consultant conducts a materiality assessment to identify the ESG topics most significant to your business and stakeholders. For companies in CSRD scope, this means a full double materiality assessment covering both impact and financial materiality. For UK SRS, the focus is on financial materiality aligned with ISSB standards. The output is a comprehensive ESG strategy with clear priorities, measurable targets, governance structures, and a multi-year delivery roadmap. A well-designed ESG strategy aligns sustainability investment with commercial objectives, ensuring resources are directed at the issues that create the most value.
2. ESG Reporting Framework Implementation
   ESG consultants establish the end-to-end reporting processes needed for compliance with multiple frameworks. This includes mapping disclosure requirements across GRI, SASB, CDP, UK SRS, and CSRD/ESRS, designing data collection systems that serve multiple frameworks efficiently, building internal workflows for data validation and sign-off, and preparing the actual reports or disclosure documents. For organisations reporting under both UK SRS and CSRD, a consultant designs an integrated approach that avoids duplicating effort while meeting both sets of requirements. This is increasingly common for UK-headquartered companies with EU operations or subsidiaries.
3. ESG Risk Assessment and Due Diligence
   For organisations managing ESG risks across operations, investments, or acquisitions, ESG consultants conduct comprehensive risk assessments. This includes identifying ESG risks across the value chain, developing risk registers with likelihood and impact scoring, building monitoring and escalation processes, and integrating ESG risk into enterprise risk management frameworks. ESG due diligence is particularly critical during M&A transactions, IPO preparation, and refinancing, where ESG risks can materially affect valuation, deal structure, and investor appetite.
4. ESG Rating Improvement Programme
   ESG consultants analyse your current performance against the methodologies used by major rating agencies, including MSCI ESG Ratings, Sustainalytics, CDP, ISS ESG, and EcoVadis. They identify specific gaps driving low scores, develop targeted improvement actions, and manage the submission and engagement process with each rating provider. EcoVadis is particularly important for companies in supply chains where customers use EcoVadis scores as procurement criteria. Improving from a Bronze to Gold EcoVadis rating can directly unlock new commercial relationships.
5. ESG Integration into Investment Decisions
   For asset managers, private equity firms, and corporate development teams, ESG consultants develop frameworks for integrating ESG factors into investment analysis. This covers ESG screening criteria, due diligence checklists, portfolio monitoring dashboards, and ESG-linked KPIs for portfolio companies. With ESG-linked financing growing rapidly, demonstrating robust ESG integration strengthens access to capital and reduces financing costs.

Who Do They Work With?

ESG consultants work across the organisation and with external stakeholders. They partner with boards and executive committees on governance and strategy, with investor relations on ESG communication and rating agency engagement, with sustainability teams on environmental performance and reporting data, with HR on social metrics including diversity, pay equity, and employee wellbeing, with legal and compliance on regulatory requirements and risk management, with finance on integrating ESG into financial reporting and securing ESG-linked financing, and with procurement on supply chain ESG performance and EcoVadis assessments.

Who Should Hire an ESG Consultant?

The short answer is any organisation that needs to measure, manage, or report ESG performance. But the specific triggers that make ESG consulting most valuable include:

Listed companies preparing for UK SRS: With mandatory reporting anticipated from January 2027, companies need to build the data systems, processes, and governance structures that UK SRS S1 and S2 require. An ESG consultant who understands both the standards and the practical implementation challenges can save months of internal effort.

Companies in CSRD scope: UK-headquartered businesses with EU operations, subsidiaries meeting CSRD thresholds, or companies in the supply chain of CSRD-reporting entities need ESRS-compliant reporting. This is a substantial undertaking that most companies cannot resource internally.

Organisations seeking to improve ESG ratings: If your EcoVadis, MSCI, or CDP scores are holding back commercial opportunities or investor relationships, targeted ESG consulting delivers measurable rating improvements.

Companies preparing for IPO or fundraising: Investors scrutinise ESG performance during due diligence. Having a credible ESG strategy and disclosure in place before fundraising strengthens your position and valuation.

Businesses responding to customer ESG requirements: Large corporates increasingly mandate ESG performance from suppliers, often through EcoVadis or bespoke ESG questionnaires. An ESG consultant helps you meet these requirements efficiently.

Key sectors include financial services, manufacturing, energy, real estate, technology, consumer goods, and professional services. But ESG requirements now extend across virtually every sector, particularly for mid-market and larger companies.

How ESG Consulting Engagements Typically Work

ESG consulting engagements range from focused projects (a single EcoVadis assessment, a CDP submission, a materiality assessment) to ongoing advisory relationships where the consultant acts as an extension of your team. Many mid-market companies engage an ESG consultant on a fractional or retainer basis, providing ongoing strategic guidance and reporting support without the cost of a full-time ESG hire. Day rates for independent ESG consultants typically start around £500-800/day depending on seniority and specialism, compared with £1,200-2,000/day from large consultancies for similar expertise.

ROI and Strategic Benefits

Strong ESG performance delivers tangible commercial returns. It improves access to capital and reduces financing costs, with sustainability-linked loans and green bonds offering preferential terms for strong ESG performers. It strengthens customer relationships, particularly in B2B supply chains where ESG scores are procurement criteria. It attracts and retains talent, with employees increasingly choosing employers aligned with their values. It reduces regulatory risk, avoiding penalties and ensuring timely compliance. And it builds brand value and stakeholder trust in an environment where greenwashing scrutiny is at an all-time high.

An ESG consultant ensures your investment in ESG delivers these outcomes rather than producing compliance-focused reports that sit on a shelf. The best ESG consulting engagements connect ESG performance with commercial strategy, making sustainability a source of competitive advantage rather than a cost centre.

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