How to Hire a Chief Sustainability Officer / Chief ESG Officer

What Is a Chief Sustainability Officer?

The Chief Sustainability Officer — also designated Chief ESG Officer, Chief Climate Officer, or Head of Sustainability at different firms — has moved from the periphery to the centre of the UK C-suite agenda over the past five years. What was a reputational and communications function a decade ago is now, for FTSE 350 firms and major private businesses, a genuine strategic and regulatory leadership role with accountability for reporting obligations that carry legal weight, capital allocation decisions that affect the firm’s cost of funding, and supply chain management responsibilities that touch every part of the operating model.

This guide explains the CSO (sustainability) role in a UK context, the regulatory framework that has elevated it from optional to essential at listed firms, what the candidate profile looks like, and how to run a credible search. It is written from the perspective of UK executive search, drawing on the work Exec Capital does on senior appointments at listed companies, major private businesses, and PE-backed firms navigating the sustainability agenda.

The abbreviation CSO is shared with the Chief Strategy Officer role covered in a separate guide. Throughout this guide, CSO refers to the Chief Sustainability Officer unless otherwise specified. Where firms use the Chief ESG Officer title, the role is functionally equivalent, though ESG framing tends to be more common in financial services and investment management contexts.

The UK Regulatory Framework Driving CSO Appointments

The elevation of sustainability leadership from a reputational function to a regulatory necessity has been driven by a series of overlapping frameworks that have, cumulatively, made the CSO appointment unavoidable for UK listed firms and many major private businesses.

Task Force on Climate-related Financial Disclosures (TCFD). TCFD disclosure has been mandatory for UK premium-listed companies since 2021 and was extended to a broader range of listed and large private firms under the Companies Act 2006 (Strategic Report) (Climate-related Financial Disclosure) Regulations 2022. TCFD requires firms to disclose their governance, strategy, risk management, and metrics and targets around climate-related risks and opportunities. These disclosures are reviewed by investors, lenders, and the FCA, and the CSO is typically the accountable senior leader for the quality and completeness of TCFD compliance.

UK Streamlined Energy and Carbon Reporting (SECR). Large UK companies are required to report their energy use and Scope 1 and 2 carbon emissions under the SECR framework within their annual reports. The CSO owns the data collection infrastructure, the reporting methodology, and the narrative around performance and progress.

Corporate Sustainability Reporting Directive (CSRD). The EU’s CSRD, which began phased implementation in 2024, applies to EU-operating firms meeting certain thresholds — and by extension to UK firms with significant EU operations, EU customers, or EU listed subsidiaries. CSRD requirements are substantially more extensive than TCFD, covering a full range of environmental, social, and governance metrics under the European Sustainability Reporting Standards (ESRS). UK firms caught by CSRD need a CSO with genuine command of the ESRS framework, not just a passing familiarity.

FCA ESG and sustainable finance requirements. The FCA’s Sustainability Disclosure Requirements (SDR) and investment labels regime affect asset managers and financial product providers operating in the UK. For financial services firms, the CSO or Chief ESG Officer role intersects directly with regulatory compliance in a way that makes technical ESG knowledge a compliance requirement rather than an optional credential.

Mandatory net zero commitments and science-based targets. A growing proportion of UK listed firms have made public net zero commitments, many aligned with the Science Based Targets initiative (SBTi). These commitments create accountability structures — annual reporting against interim targets, third-party verification, investor scrutiny — that require a CSO with the technical capability to design and manage decarbonisation programmes across the firm’s full value chain, including Scope 3 emissions.

What a Chief Sustainability Officer Actually Does

The CSO mandate at a UK listed or major private firm covers several distinct areas of ownership that require both technical expertise and commercial leadership.

Sustainability strategy development. The CSO develops and owns the firm’s sustainability strategy — defining the material ESG topics for the firm’s sector, setting targets (emissions reduction, diversity, supply chain standards, water use, waste), designing the programmes to achieve them, and ensuring that the sustainability agenda is integrated into the business strategy rather than sitting alongside it.

Regulatory reporting and compliance. TCFD, SECR, CSRD, SDR — the CSO is accountable for the firm’s compliance with all applicable sustainability reporting obligations. This requires not only technical knowledge of the frameworks but also the ability to build the data infrastructure and governance processes that generate reportable, auditable sustainability metrics across the business.

Investor and stakeholder relations. ESG is now a primary lens for many institutional investors, and the CSO is frequently the lead interlocutor with investors on sustainability performance. Proxy advisers, ESG rating agencies such as MSCI ESG and S&P Global ESG Scores, and major asset managers who have made public commitments to sustainable investment all scrutinise the CSO’s work directly.

Supply chain sustainability. Scope 3 emissions — those generated in the firm’s value chain rather than directly by the firm — typically represent the largest component of a company’s carbon footprint. Managing Scope 3 requires engagement with hundreds or thousands of suppliers, which is a major supply chain management programme in its own right. The CSO owns the Scope 3 strategy and works closely with procurement and operations leaders on implementation.

Internal sustainability culture and governance. A sustainability strategy that is owned by the CSO but not embedded in operational decision-making across the business will produce reports but not results. The CSO is responsible for building the internal governance structures — sustainability committees, KPI frameworks, business unit accountability — that ensure the firm’s sustainability commitments translate into behaviour change at every level of the organisation.

Climate risk management. Under TCFD and related frameworks, the CSO works with the CFO and CRO to assess and disclose the firm’s exposure to physical climate risks (extreme weather, supply chain disruption, asset stranding) and transition risks (policy changes, technology shifts, changing customer preferences). This is a risk management function that requires both climate science literacy and financial modelling capability.

When Is the Right Time to Hire a CSO?

Four situations consistently drive the right moment for a CSO appointment at UK firms.

Regulatory obligation. TCFD mandatory disclosure requirements, CSRD scope, and FCA SDR obligations create a compliance trigger for many UK firms. Once a firm is in scope for mandatory sustainability reporting, the complexity of those obligations — data collection, assurance, investor engagement, regulatory liaison — typically justifies a dedicated senior leader rather than distributing the accountability across existing functions.

Net zero commitment. A firm that has made a public net zero commitment, particularly one aligned with SBTi or involving third-party verification, needs a CSO to own the delivery. A public commitment without a credible internal programme is both a reputational risk and, increasingly, a regulatory risk as greenwashing standards tighten.

Investor and lender pressure. Institutional investors and sustainable finance lenders increasingly require ESG performance data as a condition of investment or lending terms. Firms seeking to access the growing pool of green or sustainability-linked finance need a CSO who can credibly engage with investor ESG requirements and manage the ongoing reporting obligations that accompany sustainability-linked capital.

Supply chain risk. UK firms with complex global supply chains face growing regulatory exposure — the UK Modern Slavery Act, the incoming corporate due diligence requirements influenced by the EU Corporate Sustainability Due Diligence Directive (CS3D), and sector-specific supply chain standards. A CSO with supply chain sustainability expertise can manage both the compliance obligations and the reputational risk that supply chain failures create.

The CSO Candidate Profile

The CSO candidate pool is one of the most rapidly evolving in the UK C-suite, because the role itself has evolved so quickly. Candidates who were appropriate for a CSO appointment five years ago — primarily corporate communications and CR professionals — are often not the right profile for the technically demanding, regulatory-intensive mandate the role now carries.

Technical ESG and reporting knowledge is now the baseline. A CSO who cannot independently navigate the TCFD framework, explain the CSRD ESRS standards, or discuss the methodology for Scope 3 category calculation is not an adequate appointment for a FTSE 350 firm with mandatory reporting obligations. The candidate does not need to be a climate scientist, but they need to have operated in the sustainability reporting environment long enough to understand the technical requirements and their limitations.

Commercial orientation is the differentiator. The most effective CSOs are those who can connect the sustainability agenda to the commercial model — the cost reduction available through energy efficiency, the premium accessible through sustainability credentials with customers, the capital cost reduction achievable through strong ESG ratings, the supply chain resilience that sustainability investment builds. A CSO who communicates sustainability purely in purpose and values terms without connecting it to financial performance will struggle to maintain board and leadership team support.

Science and engineering backgrounds are increasingly represented. As climate risk and decarbonisation strategy have become central to the CSO mandate, candidates with environmental science, engineering, or climate modelling backgrounds — who have subsequently developed commercial and communication skills — are often the strongest technical appointments. These candidates may need development on the investor relations and governance communication dimensions, but their technical foundation is more durable than that of communications-background candidates who have added sustainability knowledge later.

Financial services ESG specialists. For firms in asset management, insurance, banking, and financial services, a Chief ESG Officer who has operated within a financial services ESG function — managing portfolio ESG integration, regulatory ESG disclosure, or sustainable finance product development — brings directly relevant experience. The FCA SDR requirements, the alignment of TCFD with IFRS S1 and S2, and the engagement with proxy advisers and ESG rating agencies are best managed by someone who has done it before.

What to avoid. Communications and PR professionals who have led sustainability reporting without technical responsibility for the underlying data and programme. CSR and philanthropy leaders whose experience is primarily in community investment and charity partnerships rather than operational sustainability. External consultants who have advised on sustainability strategy without accountability for delivering it inside a complex organisation. All three profiles can be excellent contributors within a sustainability function but lack the accountable leadership credentials that a board-facing CSO role requires.

Running the CSO Search

CSO searches require a technical assessment dimension alongside the standard executive search process, because the hiring panel often lacks the ESG expertise to evaluate candidate claims independently.

Board involvement. At listed firms, the CSO will present to the board — often to the audit committee (for reporting oversight), the risk committee (for climate risk), and the full board (for sustainability strategy). The board chair and the chairs of relevant committees should be involved in the final stage assessment. Their ability to evaluate the candidate’s board communication credibility is an important quality check that the executive team alone cannot provide.

Technical assessment. A sustainability reporting or climate risk scenario exercise is the most effective way to evaluate the candidate’s technical depth. Presenting a realistic TCFD disclosure challenge, a Scope 3 data gap analysis, or a supply chain due diligence question and observing how the candidate reasons through it provides a more reliable signal than interview questions about frameworks and approaches.

Investor relations connection. Where the CSO will have significant investor engagement responsibilities, including an IR team member or a representative institutional investor perspective in the assessment is valuable. ESG-focused investors increasingly have specific views on what they expect from a FTSE CSO, and validating that the candidate meets those expectations before appointment saves significant credibility risk later.

Timeline. A full CSO search typically runs 14–16 weeks. The narrower candidate pool at the technical end of the market, the board involvement requirement, and the often-confidential nature of the search all contribute to a longer timeline than for some other C-suite roles.

CSO Compensation Benchmarks

CSO compensation at UK FTSE 350 firms has increased significantly over the past three years as demand has exceeded supply and as the strategic importance of the role has been recognised in executive pay frameworks.

Base salary. At FTSE 350 firms, CSO base salaries typically run from £200,000 to £350,000 depending on firm size, sector, and the breadth of the mandate. Financial services firms at the upper end, reflecting both the regulatory intensity and the competitive market for ESG expertise in that sector. Major private companies operating in regulated or high-visibility sectors typically benchmark at the lower end of FTSE 350 ranges.

Bonus. Annual bonuses of 25–50% of base are standard at this level. An increasing proportion of FTSE firms are including sustainability-linked KPIs in executive bonus frameworks — emissions reduction progress, TCFD assurance quality, supply chain sustainability audit outcomes — which often includes the CSO’s bonus. This alignment of financial incentives with sustainability performance is a governance best practice increasingly expected by proxy advisers and institutional investors.

Long-term incentives. Listed firm LTIPs increasingly include sustainability performance conditions alongside financial metrics. The CSO at a listed firm will typically participate in the LTIP at a level comparable to other C-suite roles. For PE-backed firms, sustainability credentials have begun to appear in management incentive plan frameworks as ESG due diligence from acquirers and lenders has become standard. The Executive Equity Incentives guide provides broader context on how these structures work.

Onboarding Your Chief Sustainability Officer

A CSO who joins without a structured onboarding programme will spend their first months auditing the firm’s sustainability position from scratch — a necessary step, but one that should be accelerated by the quality of the pre-boarding briefing and the access given in the first weeks. The briefing package given to a new CSO should include: the existing sustainability strategy and targets, all current regulatory reporting obligations and their status, the previous two years of sustainability reports and the external assurance opinions, the firm’s materiality assessment if one has been conducted, the supply chain sustainability data and audit programme status, and the most recent investor engagement outputs on ESG topics.

The first 30 days should focus on a sustainability estate audit — understanding what the firm has committed to, what data infrastructure supports those commitments, where the reporting gaps are, and where the internal capabilities and external advisers are strong or weak. This is not a strategic planning exercise; it is a factual baseline that the CSO’s strategy will be built on.

Days 30–60 should produce the CSO’s gap analysis and initial risk assessment — a clear picture of where the firm’s sustainability programme is credible and where it has material vulnerabilities. Particular attention should be given to TCFD compliance quality, Scope 3 data completeness, and any outstanding CSRD readiness gaps. This assessment should be presented to the CEO, the audit committee, and the full board in appropriate form.

Days 60–90 should deliver a 12-month sustainability programme plan — the regulatory milestones, the strategic initiatives, the team build requirements, and the budget needed to deliver on the firm’s public commitments. The CSO should also have established their working relationships with the CFO (for capital allocation to sustainability investment and for sustainability-linked finance structures) and the General Counsel (for regulatory compliance oversight and supply chain due diligence obligations).

The CSO should initiate a stakeholder mapping exercise in the first 90 days — identifying which institutional investors, proxy advisers, and ESG rating agencies are most significant to the firm, what their current ESG assessment of the firm is, and what changes in the firm’s sustainability programme would most improve those assessments. This is not about gaming ESG ratings; it is about understanding what the firm’s primary sustainability stakeholders value most and using that information to prioritise the internal sustainability agenda intelligently.

ESG Ratings and Investor Engagement

The CSO’s investor engagement role is a distinct and significant workload that is often underestimated in job descriptions. Major institutional investors — including the UK’s largest pension funds and the global asset managers with UK equity holdings — have built dedicated ESG research and engagement teams whose scrutiny of portfolio company sustainability practice is systematic and detailed.

The primary ESG rating agencies — MSCI ESG, S&P Global ESG, Sustainalytics, and ISS ESG — each use different methodologies, weight different factors, and update their assessments on different timescales. A FTSE 350 CSO needs to understand each agency’s methodology well enough to manage the firm’s engagement proactively, respond to rating inquiries accurately, and challenge assessments that are factually incorrect. Low ESG ratings from major agencies can affect the firm’s inclusion in ESG indices, its cost of sustainable finance, and its attractiveness to ESG-mandate investors — making the CSO’s rating management work a material financial activity, not just a reputational one.

Proxy advisers — ISS and Glass Lewis primarily in the UK market — have developed ESG-linked voting recommendations that affect how institutional investors vote at annual general meetings. Executive pay linked to sustainability metrics, board diversity, climate strategy, and TCFD compliance quality are all areas where proxy adviser scrutiny has increased significantly. The CSO works closely with the investor relations team and the company secretary to ensure that the firm’s sustainability disclosure meets the standards that inform proxy adviser recommendations.

Greenwashing Risk and the CSO’s Compliance Mandate

Greenwashing — making sustainability claims that are misleading, unsubstantiated, or materially incomplete — has become a significant legal and regulatory risk for UK firms, and the CSO is the primary accountable leader for managing it. The FCA’s Consumer Duty and Sustainability Disclosure Requirements create specific obligations around the accuracy of sustainability claims made to retail consumers and investors. The Competition and Markets Authority’s Green Claims Code sets out the requirements for environmental claims in commercial communications. And the UK’s alignment with the EU Green Claims Directive, when implemented, will introduce formal verification requirements for environmental marketing claims.

The practical implication for the CSO is that every public sustainability claim — whether in an annual report, a product label, a marketing campaign, or an investor presentation — needs to be supportable by underlying data and consistent with the firm’s verified sustainability performance. A sustainability function that is primarily focused on communications rather than data and performance management creates greenwashing risk by design.

The CSO should work closely with the General Counsel and the marketing leadership to establish a sustainability claims governance process — a review framework that ensures all public sustainability claims are checked against the firm’s actual performance data before publication. This is not a bureaucratic constraint on communications; it is a legal risk management process that protects the firm’s reputation and its officers’ personal liability. The FCA’s SDR guidance and the CMA’s Green Claims Code are the primary UK regulatory references for sustainability claims compliance.

Common Hiring Mistakes

1. Appointing a CSO without regulatory technical depth. The most costly mistake at FTSE-listed firms. A CSO who cannot independently manage TCFD compliance, engage with CSRD requirements, or defend the firm’s sustainability reporting methodology to the external auditor will create regulatory exposure rather than managing it.

2. Placing the CSO in the communications function. A CSO who reports to the Chief Communications Officer rather than the CEO or CFO will not have the authority or the budget to drive operational change. Sustainability is a business function, not a communications function, and the reporting line should reflect that.

3. Setting targets without a CSO to own them. Firms that make public net zero commitments or sign up to SBTi before they have a CSO to own the delivery create a credibility risk. The commitment should follow the appointment, not precede it.

4. Hiring a sustainability advocate rather than a sustainability leader. Passion for sustainability is common in the candidate pool; the ability to deliver a sustainability programme inside a complex commercial organisation while maintaining commercial credibility with the CFO and the operations team is rare. Reference conversations should focus on evidence of commercial influence, not environmental conviction.

5. Inadequate budget and resource commitment. A CSO without a meaningful programme budget, a sustainability team of adequate size, and executive committee access will be unable to deliver. The appointment decision and the resource decision need to be made simultaneously. A CSO title without the operational backing is a reputational risk in both directions — for the firm and for the candidate.

How Exec Capital Approaches CSO Appointments

Exec Capital runs CSO and Chief ESG Officer searches as retained mandates with board-level process design built in from the outset. Our approach to CSO searches includes a technical assessment component — working with the firm to design a scenario exercise appropriate to the firm’s sector and sustainability reporting obligations — alongside the standard executive search process.

Our CSO candidate network spans the FTSE sustainability leadership community, major private firm sustainability functions, financial services ESG professionals, and experienced sustainability consultants who have made the transition to in-house leadership roles. We maintain direct relationships with the sustainability professional community through the Institute of Environmental Management and Assessment (IEMA) and sector-specific sustainability forums.

The CSO appointment sits within our C-suite practice. For firms in the energy and utilities sector where the sustainability mandate carries specific Ofgem and Ofwat regulatory dimensions, see also our Energy and Utilities Executive Hiring guide.

Further Reading and Authoritative Sources

For TCFD guidance and reporting frameworks, the Task Force on Climate-related Financial Disclosures publishes the authoritative recommendations and supplemental guidance. The FCA’s TCFD implementation guidance covers the UK-specific requirements for listed firms. IFRS Sustainability Standards (IFRS S1 and S2), published by the International Sustainability Standards Board (ISSB), provide the international baseline that UK mandatory sustainability reporting standards are aligned with.

On CSRD requirements, the European Commission’s Corporate Sustainability Reporting resources and the EFRAG guidance on European Sustainability Reporting Standards provide the technical detail that UK firms with EU operations need to navigate. The Science Based Targets initiative (SBTi) provides the framework for corporate net zero target-setting that is now the industry standard for credible climate commitments.

The Institute of Environmental Management and Assessment (IEMA) is the primary UK professional body for sustainability and environment professionals and provides useful credentialling frameworks for evaluating CSO candidates’ professional standing. The UN Principles for Responsible Investment (PRI) publishes investor expectations on corporate sustainability that directly inform what institutional investors will look for in a CSO appointment.

Related Exec Capital guides: How to Hire a CEO · How to Hire a CFO · How to Hire a Chief Strategy Officer · Board Construction Guide · Energy and Utilities Executive Hiring · Executive Compensation Guide