UK ESG consultancy market

Best ESG Consultants in the UK (2026)

Q: ESG consultant vs sustainability consultant — what's the difference?

Substantial overlap. "ESG consultant" emphasises governance and the social dimension alongside environment; "sustainability consultant" historically skewed environmental. In practice the labels are used interchangeably by most UK Big Four and pure-play firms. The clearer distinguishing factors are: client function (CFO/investor relations leans ESG; COO/operations leans sustainability) and disclosure target (CSRD/PCAF leans ESG; SECR/ESOS leans sustainability).

Q: What does UK ESG consultancy cost?

Day rates: Big Four partners £2,500–£4,500/day; pure-play partners £1,800–£3,500/day; senior managers £900–£1,800/day; managers and consultants £400–£1,200/day. Project fees scale: ESG ratings improvement programmes £25k–£80k; CSRD/ESRS readiness for UK groups with EU subsidiaries £100k–£400k; PCAF financed-emissions programmes for financial services £150k–£500k.

Q: Which sectors use ESG consultants most in the UK?

Financial services lead UK ESG hiring (banks, asset managers, insurers, pension funds — driven by PCAF financed emissions and CSRD). FTSE 250 listed companies preparing for UK SRS S2 are the second-largest market. Big Four ESG advisory and law firms hire ESG consultants directly. PE-backed portfolio companies are a fast-growing market under PCAF/CSRD-aligned investor reporting.

The UK ESG consultancy market in 2026 — 15 verified firms covering Big Four (Deloitte, EY, KPMG, PwC — all Verdantix 2026 Leaders), pure-play leaders (ERM, Anthesis), engineering-led multidisciplinary (WSP, Mott MacDonald, Arup, AtkinsRéalis), assurance specialist (Bureau Veritas), and mid-tier UK firms (Ricardo, RSK, SLR, EcoAct).

15 firms verified live

~500

UK-listed companies in CP26/5 scope (UKLR6, 16, 22)

UK-specific amendments to IFRS S1/S2

Core pillars: Governance, Strategy, Risk, Metrics

Scope 3 emission categories under GHG Protocol

Quick-pick

Which UK ESG consultancy fits which buyer?

The UK ESG consultancy market splits on three axes: client type (FTSE listed vs financial services vs PE-backed); regulatory perimeter (UK SRS only vs UK SRS + CSRD vs UK SRS + CSRD + SEC); and depth (transformation programme vs targeted readiness vs assurance integration).

The quick-pick table below maps the 15 firms to the buyer profile they best serve.

Verdantix Green Quadrant 2026, OneStop ESG, Environment Analyst

Buyer profile	Recommended firms	Why
FTSE 100 ESG transformation (multi-jurisdiction)	Deloitte, EY, KPMG, PwC, ERM	Big Four assurance bench + ERM scale; Verdantix 2026 Leaders
Financial services (PCAF financed em.)	PwC, Deloitte, EY, ERM, EcoAct	PCAF benches; financial-services depth
FTSE 250 listed (UK SRS S2 readiness)	Anthesis, Ramboll, WSP, Bureau Veritas, Big Four	Pure-play depth + assurance integration
UK groups with EU subsidiaries (CSRD dual-track)	Big Four, ERM, Ramboll, Anthesis	European delivery networks + dual-track capability
Built environment ESG	Arup, WSP, Mott MacDonald, Ramboll	Embodied carbon + design integration
Sector specialism (mining / energy)	SLR, Ricardo, ERM	Sector benches + transaction ESG due diligence
ESG verification / assurance-led	Bureau Veritas, Big Four	TIC + audit integration
Carbon-led ESG strategy	EcoAct, Anthesis, Big Four	Carbon footprinting + decarbonisation

"ESG consultancy in 2026 is increasingly indistinguishable from finance consulting at the senior end — the connectivity between sustainability disclosures and the audited financial statements has pulled the discipline into the CFO's orbit."UK SRS Implementation Guide

15 firms

UK ESG consultancies — detailed profiles (May 2026)

The 15 firms below were confirmed as live, trading UK ESG consultancies at time of publication.

Big Four practices first (Verdantix 2026 Leaders), then pure-play sustainability advisories, then engineering-led multidisciplinary firms, then assurance specialist Bureau Veritas, then UK mid-tier specialists.

We have excluded ourselves from the list — uksrs.org.uk is an independent UK reference, not a consultancy.

Market verification 28 May 2026; firm websites cross-referenced; Verdantix Green Quadrant 2026

Deloitte UK — ESG ServicesBig Four

deloitte.com/uk · Global Big Four · Verdantix 2026 Leader

Global

UK Standards

CSRD, UK SRS, IFRS S2, SEC

Whole-ESG

Coverage

E + S + G + governance

Engagement

Timeline

Programme + audit-integrated

Best For

Target

FTSE 100 ESG transformation

Deloitte UK — Verdantix 2026 Green Quadrant Leader for sustainability consulting. Comprehensive ESG capabilities across environment, social and governance disclosure plus the bridge to audited financial statements. Strongest on cross-jurisdiction reporting (UK SRS + CSRD + SEC) and audit-integrated assurance.

Standards Coverage

CSRD/ESRSUK SRS S1/S2ESG ratings advisoryPCAF financed em.Lightweight SME

Big Four audit integration

Multi-jurisdiction reporting

Board-level advisory

SME pricing tier

Website ↗

EY UK — Sustainability & ESG StrategyBig Four

ey.com/en_uk · Global Big Four · Verdantix 2026 Leader

Global

UK Standards

CSRD, UK SRS, IFRS S2, SEC

Whole-ESG

Coverage

Strategy + reporting + assurance

Engagement

Timeline

Programme delivery

Best For

Target

Complex large-scale ESG change

EY UK — Verdantix 2026 Leader. Market-leading on complex, large-scale ESG transformations. Strong on the finance-ESG bridge (IFRS S2 / UK SRS S2 connectivity to audited financials) and cross-border CSRD / UK SRS / SEC mapping for multinationals.

Standards Coverage

CSRD/ESRSUK SRS S2Finance-ESG bridgeInvestor reportingLightweight SME

Big Four assurance bench

Cross-border ESG mapping

Large-scale programme delivery

SME pricing tier

Website ↗

KPMG UK — Sustainability & ESGBig Four

kpmg.com/uk · Global Big Four · Verdantix 2026 Leader

Global

UK Standards

CSRD, UK SRS, IFRS S2, SEC

Value-led

Coverage

ESG transformation + tech-enabled

Engagement

Timeline

Elevate + Velocity AI

Best For

Target

Value-led ESG transformation

KPMG UK — Verdantix 2026 Leader. Distinguished by value-led methodology and the KPMG Elevate + Velocity AI platforms for accelerated ESG transformation. Widely cited UK CP26/5 commentary; strong on quantifying transition risk for boards.

Standards Coverage

CSRD/ESRSUK SRS S2Transition risk quantificationAI-enabled deliveryLightweight SME

KPMG Elevate methodology

Velocity AI platform

Audit integration

SME pricing tier

Website ↗

PwC UK — Sustainability & ESGBig Four

pwc.co.uk · Global Big Four · Verdantix 2026 Leader

Global

UK Standards

CSRD, UK SRS, IFRS S2, SEC

Business-integrated

Coverage

Commercial + investor angle

Engagement

Timeline

Programme + run-state

Best For

Target

PCAF + commercial integration

PwC UK — Verdantix 2026 Leader. Business-integrated ESG with particular strength in PCAF financed emissions for financial services, transition planning, and connectivity between ESG disclosures and capital-allocation decisions.

Standards Coverage

CSRD/ESRSPCAF financed em.Transition planningInvestor reportingLightweight SME

Big Four assurance bench

PCAF / financial-services depth

Capital-allocation framing

SME pricing tier

Website ↗

ERMPure-play Leader

erm.com · London HQ · Verdantix 2026 Leader

Global

UK Standards

CSRD, UK SRS, IFRS S2

Whole-ESG

Coverage

E + S + G + nature + climate

Engagement

Timeline

Pure-play programme delivery

Best For

Target

Pure-play ESG depth

ERM — world's largest pure-play sustainability advisory and Verdantix 2026 Leader (joint highest capabilities). London HQ; deep UK regulatory bench across SECR, ESOS, UK SRS S2 and CSRD. Strong technical environment expertise plus board-level ESG strategy.

Standards Coverage

CSRD/ESRSUK SRS S2Environment + natureSocial due diligenceBig Four-equivalent scale

Pure-play sustainability focus

Global delivery network

Environmental technical depth

Audit / assurance bench

Website ↗

Anthesis GroupPure-play

anthesisgroup.com · London HQ · Digital + science-based

Global

UK Standards

CSRD, UK SRS, SBTi

Whole-ESG

Coverage

Strategy + carbon + nature + social

Engagement

Timeline

Sustainability-led

Best For

Target

Science-based, digitally enabled

Anthesis Group — purpose-driven, digitally enabled, science-based ESG advisory. Strong on combined sustainability strategy, carbon footprinting, nature/biodiversity and SBTi target-setting. UK headquartered with depth in Scope 3 supplier engagement.

Standards Coverage

UK SRS S2SBTi target-settingNature + biodiversityScope 3 supplier eng.Big Four scale

Digitally enabled delivery

SBTi specialism

Nature practice

Audit / assurance bench

Website ↗

WSP UKGlobal E&S Leader

wsp.com/en-gb · Top-3 global E&S · Verdantix 2026 Leader

Global

UK Standards

CSRD, UK SRS S2

Multidisciplinary

Coverage

ESG + engineering

Engagement

Timeline

Programme + technical

Best For

Target

Built environment ESG

WSP UK — top-3 global environmental and sustainability consultancy and Verdantix 2026 Leader. Strongest on built environment ESG, operational and embodied carbon, transition risk on portfolio real estate, plus infrastructure decarbonisation.

Standards Coverage

UK SRS S2Built environmentInfrastructureMultidisciplinary scaleFinance-grade reporting

Built environment specialism

BREEAM / LEED bench

Engineering integration

Big Four finance bridge

Website ↗

Ramboll UKVerdantix Leader

uk.ramboll.com · Built environment + energy · Verdantix 2026 Leader

UK + Global

UK Standards

CSRD, ESRS, UK SRS

Whole-ESG

Coverage

Strategy + urban + energy

Engagement

Timeline

Practical operational support

Best For

Target

Urban planning + green energy

Ramboll UK — Verdantix 2026 Leader. Practical sustainability support across urban planning and green energy. Notable depth in CSRD/ESRS implementation for UK groups with European operations.

Standards Coverage

CSRD/ESRSUK SRS S2Urban planningGreen energyLightweight SME

Practical operational support

European delivery network

Built environment depth

Audit / assurance bench

Website ↗

ArupUK Independent

arup.com · UK-HQ independent · Built environment + ESG

UK + Global

UK Standards

CSRD, UK SRS

Multidisciplinary

Coverage

Design + climate + ESG

Engagement

Timeline

Design + advisory

Best For

Target

Climate resilience + built environment

Arup — UK-headquartered independent firm renowned for engineering, with deep ESG and climate resilience practice. Strong on embodied carbon in major projects and integration of sustainability into design decisions from concept stage.

Standards Coverage

UK SRS S2Embodied carbonClimate resilienceBuilt environmentFinance-grade reporting

Independent firm structure

Design integration

Climate adaptation specialism

Finance-ESG bridge

Website ↗

Ricardo (Energy & Environment)UK Engineering

ricardo.com · UK-based · Transport + energy + ESG

UK + Global

UK Standards

CSRD, UK SRS, transport policy

Sector-led

Coverage

Energy + transport ESG

Engagement

Timeline

Technical + advisory

Best For

Target

Transport + UK government

Ricardo Energy & Environment — UK-headquartered specialist in transport, energy and environmental consulting. Strong on fleet electrification, transport-sector decarbonisation, and UK government policy advisory.

Standards Coverage

UK SRS S2Transport ESGUK government advisoryTechnical depthBig Four scale

Transport specialism

UK government bench

Technical engineering depth

Whole-ESG breadth

Website ↗

Bureau Veritas UKAssurance + Advisory

bureauveritas.co.uk · UK assurance + ESG advisory · TIC + verification

UK + Global

UK Standards

CSRD, UK SRS, ISO

Assurance + advisory

Coverage

ESG verification + advisory

Engagement

Timeline

TIC + advisory

Best For

Target

ESG verification + assurance

Bureau Veritas UK — UK assurance and ESG advisory practice. Strong on testing, inspection and certification (TIC) plus ESG verification services that complement the assurance trajectory of UK SRS S2 implementation. ISO 14001 / 45001 implementation experience.

Standards Coverage

ESG verificationISO standardsUK SRS S2 readinessTIC servicesStrategy consulting depth

Assurance + advisory integration

TIC verification services

ISO implementation bench

Strategy + transformation depth

Website ↗

Mott MacDonaldUK Engineering

mottmac.com · UK-HQ · Infrastructure + ESG

UK + Global

UK Standards

CSRD, UK SRS

Multidisciplinary

Coverage

Infrastructure ESG

Engagement

Timeline

Technical + advisory

Best For

Target

Infrastructure ESG

Mott MacDonald — major UK-headquartered infrastructure and sustainability consultancy. Strong on the integration of ESG into civil and major infrastructure programmes, transport decarbonisation and water/utilities ESG.

Standards Coverage

UK SRS S2Infrastructure ESGUtilities sectorPublic sector reachFinance-grade reporting

Major infrastructure specialism

UK Government bench

Engineering integration

Finance-ESG bridge

Website ↗

RSK GroupUK Mid-tier

rskgroup.com · UK-based · Integrated E&S

UK + Global

UK Standards

UK SRS, CSRD

Integrated E&S

Coverage

Environment + sustainability + advisory

Engagement

Timeline

Multi-discipline

Best For

Target

UK regional integrated programmes

RSK Group — UK-based integrated environment and sustainability consultancy. Multi-disciplinary delivery across environmental impact assessment, sustainability strategy and engineering advisory. Strong UK regional presence outside London.

Standards Coverage

UK SRS S2EIA / environmentUK regional reachMulti-disciplineBig Four scale

UK regional coverage

Acquisition-led growth

Multi-discipline integration

Big Four assurance bench

Website ↗

SLR ConsultingGlobal Mid-tier

slrconsulting.com · UK + Global · Mining + energy + ESG

Global

UK Standards

Sector ESG standards

Sector-led

Coverage

Mining + energy + ESG

Engagement

Timeline

Technical + advisory

Best For

Target

Sector-specific ESG due diligence

SLR Consulting — UK and global sustainability practice with sector-led focus on mining, energy and environment. Strong on ESG due diligence for transactions, supplier engagement for mineral supply chains, and sector-specific reporting.

Standards Coverage

UK SRS S2Mining sectorEnergy sectorTransaction ESG DDGeneralist whole-ESG

Mining specialism

Energy sector depth

Transaction due diligence

Generalist whole-ESG

Website ↗

EcoAct (an Atos company)Carbon-led ESG

eco-act.com · UK + International · Carbon-led ESG

UK + Global

UK Standards

UK SRS S2, SBTi

Carbon-led ESG

Coverage

Footprint + decarbonisation + ESG

Engagement

Timeline

ESG programme delivery

Best For

Target

Carbon-led ESG strategy

EcoAct (an Atos company) — UK and international sustainability consultancy with a carbon-led ESG focus. Strong on UK SRS S2 / IFRS S2 carbon-side implementation. International delivery network through Atos parent.

Standards Coverage

UK SRS S2Carbon footprintDecarbonisationESG programme deliveryWhole-ESG breadth

Carbon specialism

Decarbonisation roadmaps

International delivery

Audit / assurance bench

Website ↗

FAQ

UK ESG Consultants — Frequently Asked Questions

Common UK ESG consultancy buyer questions, with answers linking to the regulatory pages, sibling consultancy guides and the recruitment alternatives.

Topics: role definition, Verdantix 2026 Leaders, ESG vs sustainability label, cost, sectors hiring, CSRD impact, PCAF coverage, consultancy vs recruiter.

Verdantix Green Quadrant 2026, OneStop ESG, Hays 2026

What does an ESG consultant do?

An ESG consultant advises clients on environmental, social and governance disclosure, ESG ratings management (CDP, MSCI, Sustainalytics), regulatory disclosure (UK SRS S1/S2, CSRD/ESRS, SEC), materiality assessment, transition planning, PCAF financed emissions for financial services, and investor-facing ESG reporting.

Big Four ESG practices typically run multi-jurisdiction programmes; pure-play firms run deeper technical engagements.

Which UK ESG consultancies are Verdantix 2026 Green Quadrant Leaders?

The Verdantix Green Quadrant: Sustainability Consulting 2026 identified five Leaders with the most comprehensive sustainability/ESG consulting capabilities: Deloitte, EY, KPMG, PwC and ERM.

In adjacent quadrants Cority, Sphera (see the carbon reporting software guide), WSP and Ramboll were also recognised as Leaders in specific specialisms.

ESG consultant vs sustainability consultant — what's the difference?

Substantial overlap. "ESG consultant" emphasises governance and the social dimension alongside environment; "sustainability consultant" historically skewed environmental.

In practice the labels are used interchangeably by most UK Big Four and pure-play firms. See the UK sustainability consultancy guide for the broader sustainability cut.

What does UK ESG consultancy cost?

Day rates: Big Four partners £2,500–£4,500/day; pure-play partners £1,800–£3,500/day; senior managers £900–£1,800/day; managers and consultants £400–£1,200/day.

Project fees scale: ESG ratings improvement programmes £25k–£80k; CSRD/ESRS readiness for UK groups with EU subsidiaries £100k–£400k; PCAF financed-emissions programmes for financial services £150k–£500k.

Which sectors use ESG consultants most in the UK?

Financial services lead UK ESG hiring (banks, asset managers, insurers, pension funds — driven by PCAF financed emissions and CSRD). FTSE 250 listed companies preparing for UK SRS S2 are the second-largest market.

Big Four ESG advisory and law firms hire ESG consultants directly. PE-backed portfolio companies are a fast-growing market under PCAF/CSRD-aligned investor reporting.

How does CSRD affect UK ESG consultancy demand?

CSRD has dramatically increased UK ESG consultancy demand because UK groups with material EU subsidiaries fall in scope. Even after the 2025 EU Omnibus reduced scope, CSRD covers thousands of UK groups indirectly.

Big Four firms (with EU presence) are best placed for the full CSRD/UK SRS dual-track. Pure-play firms with European delivery networks (ERM, Anthesis, Ramboll) are also strong fits.

Do ESG consultants cover PCAF financed-emissions reporting?

All four Big Four (Deloitte, EY, KPMG, PwC) have dedicated PCAF practices for UK financial-services clients. PwC has particularly strong PCAF positioning.

Among pure-play firms, ERM and Anthesis cover PCAF; specialist providers Persefoni (software) and EcoAct (consulting) round out the technical capability. See the UK SRS Scope 3 reporting reference for the financed-emissions methodology.

ESG consultant vs ESG recruiter — what's the difference?

An ESG consultant delivers project work (ESG ratings improvement, CSRD readiness, materiality assessment, transition plan delivery) — usually charged as project or day-rate fees.

An ESG recruiter places candidates into in-house roles (ESG Manager, Head of Sustainability, CSO) — usually charged as percentage-of-salary placement fees.

Related guides & references

Market verification

UK ESG consultancies last reviewed 28 May 2026; all 15 firms confirmed live with URLs. Verdantix 2026 Green Quadrant designations cited.

Primary sources: 1, 2, 3.

uksrs.org.uk is an independent UK sustainability and ESG reference. We have no commercial relationship with the firms named.