Chief Sustainability Officer (CSO) — UK Role, Salary & Hiring Guide

A Chief Sustainability Officer (CSO) is a senior executive accountable for an organisation's sustainability strategy and performance.

The role typically spans climate strategy, regulatory disclosure (UK SRS S2, IFRS S2, CSRD, SECR), Scope 1/2/3 emissions, ESG ratings, supply-chain sustainability and the transition plan.

CSOs sit in the C-suite, usually reporting to the CEO or to a board sustainability committee, and combine commercial influence with technical depth.

There is no official UK statistic for Chief Sustainability Officer salary by seniority.

The closest official figure is the Home Office's Skilled Worker “going rate” for ONS SOC code 2152 (Environment professionals): £37,200 — a whole-occupation median based on ASHE 2024 data, not a CSO-specific or seniority-banded figure.

Recruiter surveys circulate widely varying CSO figures, but none discloses a UK-specific, sustainability-only sample large enough to support a benchmark.

Principal People and EnableGreen cite no survey at all, and the OneStop ESG 2026 Sustainability Salary Survey's UK figures are Shirley Parsons' 2025 UK HSEQ & Sustainability Survey numbers relayed second-hand, with the UK sub-sample size never stated.

Hays plc's own audited FY25 results — net fee income down 12.7%, placements down 8.8% 4 — are a useful counterweight to any narrative of runaway demand for the role.

There is no single mandatory qualification.

CSOs typically combine a relevant degree (environmental science, engineering, business or finance) with one or more recognised UK credentials — IEMA Practitioner Member (PIEMA) or Chartered Environmentalist (CEnv) via the Society for the Environment for the sustainability profession route, or chartered accountant (ICAEW/ACCA) plus sustainability specialisation for the finance route.

Increasingly, CSOs are recruited from finance and strategy backgrounds because UK SRS S1's connected-information requirement — that sustainability disclosures relate to the same reporting entity and use data and assumptions consistent with the financial statements (paragraphs 20–24) — is now central to the role.

See how to become a sustainability consultant for the qualification pathways.

Across a typical month, a CSO leads board-level sustainability reporting, oversees regulatory disclosure (UK SRS S2, CSRD, SECR, ESOS), engages investors on ESG performance, sets and revises net-zero targets and the transition plan, oversees the sustainability function (typically 5–25 FTE), and engages with industry bodies and regulators.

The role is less reporting-led and more strategy- and capital-allocation-led than five years ago — increasingly sitting in commercial decisions where carbon, climate or social impact is material.

Almost all FTSE 100 and a growing share of FTSE 250 companies now have a CSO or equivalent senior sustainability lead.

Sectors with the highest CSO density: financial services (PCAF financed emissions, CSRD / UK SRS exposure), oil & gas and utilities (transition pressure), retail and consumer (Scope 3 product-use emissions), real estate (operational + embodied carbon), and pharmaceuticals.

Private-equity-backed portfolio companies are increasingly hiring CSOs because PE investors are themselves under PCAF / CSRD-aligned reporting pressure.

CSO hiring is almost exclusively retained executive search.

The leading UK specialist firms include Acre, EnableGreen, Hanson Search, Principal People, Shirley Parsons, Lewis Davey and the Big Four search practices — see the UK sustainability recruitment agency guide for the full list.

Typical retained fee: 30–35% of total first-year compensation.

Engagement length: 12–20 weeks from briefing to offer.

Briefing the search consultant on your specific regulatory obligation (the proposed UK SRS S2 mandatory date, CSRD scope, financed-emissions exposure) is essential — generalist briefs produce generalist shortlists.

Three shifts in 2026.

First, connected information — UK SRS S1 requires sustainability disclosures to relate to the same reporting entity, use data and assumptions consistent with the financial statements, and be published at the same time as the audited accounts (paragraphs 20–24 and 64), pulling the CSO closer to finance.

Second, transition-plan accountability — the FCA has proposed that in-scope listed companies disclose whether they have published a transition plan (or explain), which would make the CSO accountable for capital-allocation decisions, not just reporting; this is proposed and not yet finalised.

Third, assurance — the FRC issued ISSA (UK) 5000 in November 2025 for voluntary use from 15 December 2026, and its proposed practitioner register (targeted for mid-2026) has not gone live 6; neither is mandatory.

A CSO is a board/C-suite role with profit-and-loss influence, capital-allocation authority and external face.

A Head of Sustainability typically reports into the CSO (or to another C-suite role like the COO or CFO) and runs the sustainability function operationally — managing the team, owning the carbon inventory, leading the disclosure cycle.

Mid-market UK companies often have a Head of Sustainability without a CSO; FTSE 100 companies typically have both.

The reporting structure should be clear in the governance disclosure under UK SRS S2.