ESG Due Diligence Process: What Investors and Private Equity Firms Evaluate

What ESG Due Diligence Is and Why It Matters for Investors

ESG due diligence is no longer something investors look at after financial checks; it’s something that sits right alongside them. At its core, it is about understanding how a company operates beyond the numbers.

Investors use ESG due diligence to identify non-financial risks like regulatory penalties, supply chain disruptions, or governance failures. ESG due diligence helps surface these early, before they become expensive surprises.

In India, ESG due diligence aligns with SEBI’s BRSR framework, mandatory for top 1,000 listed companies, with BRSR Core KPIs gradually expanding coverage. So, for Indian investors and PE firms, BRSR compliance is the baseline for ESG due diligence. 

ESG Due Diligence Process in Investment and M&A Decisions

The ESG due diligence process usually runs parallel to financial and legal diligence.

It typically starts with identifying what actually matters for the target company. A manufacturing firm, for example, will be assessed very differently from a tech company. For Indian companies, this scoping must prioritise BRSR applicability: Is the target among the top 1,000 listed entities required to file full BRSR? If not, is it preparing for BRSR Core (top 250 from FY 2024-25)? These determinations shape the entire diligence scope.

Investors examine policies, disclosures, and operations to spot gaps between reporting and practice.

The final stage of the ESG due diligence process focuses directly on deal terms. Risks may lead to price adjustments, while strong ESG performance can strengthen the investment case.

Key Components of ESG Due Diligence in Corporate Evaluation

When investors look at a company through ESG due diligence, they are not just ticking boxes; they are trying to figure out how things actually work behind the scenes. The key components include:

Environmental

• Compliance approvals, emissions, climate-related regulations

• Resource usage: water, waste, hazardous materials

Social

• Labour conditions, safety incidents, POSH Act compliance

• Workforce diversity, training, attrition

Governance

• Board composition and accountability

• Risk management & compliance systems

• Related-party transactions

This framework helps investors understand operational and strategic stability quickly.

ESG Due Diligence in Private Equity: Industry Evolution

Private equity has moved beyond 'check-the-box' ESG reviews. Research indicates that 83% of PE professionals believe their due diligence approach needs significant improvement. This highlights rapid ESG integration in Indian private markets. Indian PE firms increasingly use BRSR alignment as a pre-investment filter, requiring portfolio companies to meet disclosure standards before Series B/C funding. Leading practices include:

• Pre-investment: ESG screening using ILPA Due Diligence Questionnaire or UN PRI Private Equity DDQ, adapted for Indian BRSR compliance; verification of POSH Act compliance, CSR Section 135 applicability, and BRSR Core readiness for top 250 listed targets

• Post-acquisition: Active ESG strategy implementation with BRSR gap remediation and CSR impact assessment (if ₹10 crore+ average obligation)

• Exit preparation: ERSG performance documentation aligned with SEBI LODR and BRSR to attract institutional buyers and prepare for IPO

ESG Due Diligence Checklist Used by Investors and Private Equity Firms

Most firms rely on an ESG due diligence checklist to keep assessments consistent across deals. Without it, important areas are easy to overlook, especially under tight timelines.

A typical ESG due diligence checklist covers:

Regulatory Applicability 

• BRSR compliance status: Full BRSR filed (top 1,000 listed) or voluntary adoption planned

• BRSR Core readiness: 9 essential KPIs tracked, assured (top 250 from FY 2024-25, top 500 from FY 2025-26, top 1,000 from FY 2026-27)

• CSR Section 135 applicability: ₹500 crore+ net worth / ₹1,000 crore+ turnover / ₹5 crore+ net profit thresholds; 2% spending compliance; CSR Committee constitution; impact assessment (if ₹10 crore+ average obligation)

• Value chain disclosure readiness: FY 2025-26 mandatory for top 500 listed entities (partners contributing ≥2% of purchases/sales, capped at 75% of total value)

Environmental

• Regulatory approvals and environmental compliance status (CPCB/SPCB Consent to Operate/Establish)

• Emissions data and exposure to climate-related regulations

• Water usage, waste management, and hazardous waste disposal records

• BRSR Section C environmental disclosures verification

Social

• Labour conditions, safety records, and workforce policies

• POSH Act compliance: ICC constitution, policy disclosure, annual training records

• Factories Act 1948 and Contract Labour Act 1970 compliance (if applicable)

• BRSR Section C workforce diversity, training hours, median wages, attrition rates

• PF/ESIC/gratuity statutory compliance verification

Governance

• Governance structures, including decision-making controls

• Companies Act 2013 Section 166(2): Directors' stakeholder duties documentation

• SEBI LODR compliance: Board composition (woman director, independent directors), audit committee, whistle-blower mechanism

• Section 134(3): Material ESG changes and risk management policy disclosures

• Related-party transactions: Approval processes and disclosure accuracy (critical for family-owned businesses)

Cross-Cutting

• Supply chain dependencies and third-party risks

• Any ongoing disputes, penalties, or compliance gaps

• Digital Personal Data Protection Bill alignment (emerging requirement)

A checklist ensures no critical ESG areas are overlooked. Two companies may tick similar boxes, but the underlying risk profile can still be very different.

Role of Sustainability Due Diligence in Risk Identification and Value Creation

Sustainability due diligence often brings out issues that don’t come up during financial or legal checks.

From a risk point of view, it helps identify areas that can create problems later, like gaps in compliance, inefficient use of resources, or dependencies that are not immediately visible. 

At the same time, sustainability due diligence is not only about finding risks. It also highlights where improvements can make a difference. For example, better resource management or more consistent processes can improve efficiency and reduce costs over time.

When this is included as part of the ESG due diligence process, it gives a more balanced view, that is, covering both the risks involved and the areas where the business can perform better.

What an ESG Due Diligence Report Typically Includes

ESG due diligence reports summarize key risks, regulatory gaps, and improvement areas impacting investment decisions.

In practice, an ESG due diligence report generally covers:

• Key risks that may affect the business

• Regulatory exposure and compliance gaps

• How the company compares with industry practices

• Specific areas where improvements are needed

What makes the report useful is how clearly it highlights these points. Investors are not looking for detailed descriptions of every issue. The focus is on understanding what needs attention and how it could influence the deal.

Common Challenges in Conducting ESG Due Diligence

Even with structured frameworks, the practical hurdles are:

• Limited or Poor-Quality Data: Many companies still lack consistent ESG metrics. This makes it difficult to assess ESG performance accurately.

• Identifying Material Issues: Not all ESG risks carry equal weight. Misjudging what is material for a company’s sector or operations can lead to incomplete or misleading assessments.

• Regulatory Complexity: ESG regulations evolve rapidly. Companies operating across regions may face conflicting or overlapping compliance requirements. This complicates due diligence.

• Internal Alignment: Collecting ESG information often requires coordination across multiple teams. Misalignment can cause delays or gaps in reporting.

• Interpreting Findings for Investment Decisions: Similar ESG checklists can produce different risk profiles. Translating findings into actionable insights for deal terms requires expertise and judgment.

Key Takeaways on ESG Due Diligence for Investment Decision-Making

ESG due diligence has moved from being a supporting exercise to a central part of investment evaluation.

• It helps uncover risks that are not visible through financial analysis alone.

• The ESG due diligence process improves how deals are structured and negotiated.

• An ESG due diligence checklist ensures consistency across transactions.

• A well-prepared ESG due diligence report provides clarity, not just information.

• Sustainability due diligence brings both risk awareness and value insights into the same view.

Moreover, for investors, the shift is clear. ESG due diligence is no longer about meeting expectations; it is about making better decisions.