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Sustainability consultancy UK · criteria first, firms second
There is no useful answer to “which are the best sustainability consulting firms in the UK?” until you know which obligation you are closing, by when, and who has to sign the result.
This page sets out those selection criteria, each tied to the provision that makes it matter — SECR, ESOS, UK SRS under the FCA’s rules and the independence standards — and then an alphabetical directory of firms.
This site has assessed none of those firms: each is described only from its own site, in no order of merit, and none has paid to appear.
Choose by the obligation you must close and the date you must close it, not by the size of the firm .
What the work is
Strip the vocabulary away and a sustainability consultancy sells three things: a measurement you do not have, a disclosure you cannot yet write, and a change programme someone has to run.
The measurement is the least glamorous and most underestimated part: a greenhouse gas inventory built to the GHG Protocol’s Scope 3 Standard, an energy audit that survives a regulator, a boundary that does not drift between years.
The disclosure is a writing job with a legal edge, because the words go into a directors’ report or strategic report and carry the same liability as the rest of it.
“Consultancy”, “consulting” and “advisory” describe the same work in the UK market; the differences are house style.
A sustainability consultancy is not a certification body: ISO/IEC 17021-1 stops a certification body offering management system consultancy, and bars it from certifying a client for at least two years after it or a related body has provided consultancy or internal audits.
It is not an assurance provider either, and it is not a recruiter: a recruiter places a person, while a consultancy delivers a piece of work.
If the gap is permanent, the better answer may be a head of sustainability or a sustainability manager rather than a retainer.
Whether to hire at all, rather than whom, is covered in how to choose a sustainability consultant.
A sustainability consultancy is bought to close the gap between what an organisation must disclose and what it can currently evidence.
The size of that gap, not the size of the firm, should decide whom you hire.
Kinds of firm
The same label covers six kinds of organisation, and each answers a different question about independence, scale and who signs.
The big firms, the boutiques and the multidisciplinary practices that people search for sit across these six, and this page ranks none of them.
A multidisciplinary firm has more than one bench under one name, so ask which people on the proposal are its own employees.
The alphabetical directory below includes firms of every kind, each described only from its own site.
Choosing between kinds is a question about the work: how to choose a sustainability consultant takes it step by step.
“Best”, “top”, “leading”
Most superlatives in this market trace back to a small number of commercial studies, and each measures something different from what a buyer usually means by “best”.
Verdantix’s Green Quadrant on sustainability consulting, summarised in its press release, assesses providers’ capabilities against its own criteria.
Consultancy.uk’s 2026 UK sustainability ranking bands a much wider field of firms by its own method.
Environment Analyst publishes market intelligence on firms’ size and growth, behind membership.
Breadth, banding and revenue are three different questions, and none of them is “who will close my gap, on my dates, to a standard that survives whoever reads it”.
This site reproduces none of those results and ranks no firm; treat any ranking as evidence about a firm, not as a shortlist.
The sister reference sustainabilityreportingstandards.co.uk keeps its own guide to sustainability consultancies.
The directory
The panel lists every firm named in this site’s consultancy guides, in alphabetical order.
Each line paraphrases what the firm’s own website said about itself when it was read on 1 October 2026, and nothing more.
This site has assessed none of these firms, verified none of their claims, and has no commercial relationship with any of them; no firm paid to appear.
The list includes audit and advisory firms, engineering consultancies, a testing and certification group and software platforms with advisers, because all of them sell work under the sustainability label.
Use the filter to find firms whose own descriptions mention the work you need, then apply the criteria above to that shortlist.
The narrower cuts are in the carbon footprint, carbon consultancy, net zero and ESG consultant guides.
All firms named in this site’s consultancy guides
24 of 24 firms shown.
Alphabetical; the order means nothing.
In its own words, summarised: Supply chain risk management: supplier risk, contractor and site compliance and carbon impact, using verified data, monitoring and independent assurance.
In its own words, summarised: A sustainability consulting group that describes guiding clients through an end-to-end sustainability journey.
In its own words, summarised: Planning, design and engineering of the built environment and infrastructure.
In its own words, summarised: Engineering and project delivery across how people are housed, connected, powered and protected.
In its own words, summarised: Testing, inspection and certification, with sustainability listed among its key services.
In its own words, summarised: Climate transition work with businesses, governments, financial institutions and philanthropies, across and within sectors.
In its own words, summarised: A platform for carbon accounting across Scopes 1 to 3, reports for SBTi and CSRD, climate projects and climate labels, with advisory support.
In its own words, summarised: ESG advisory services: working with businesses on innovation, emissions reduction, resilience and trust.
In its own words, summarised: EcoAct’s site says it is now SE Advisory Services, Schneider Electric’s global consulting practice, covering climate strategy and decarbonisation.
In its own words, summarised: Sustainability consulting and advisory: corporate sustainability, net zero and climate change, and renewable energy.
In its own words, summarised: EY-Parthenon sustainability and ESG strategy consulting: strategy, M&A, capital allocation and portfolio work.
In its own words, summarised: A platform to measure, report and reduce a company’s and its products’ carbon footprint, including greenhouse gas assessments and life cycle assessment.
In its own words, summarised: Energy buying and management alongside sustainability reporting and compliance support.
In its own words, summarised: Sustainability reporting and disclosure services across SECR, TCFD, ISSB and UK SRS and CSRD, carbon accounting and assurance readiness.
In its own words, summarised: An employee-owned engineering, management and development consultancy across transport, energy, water, buildings and infrastructure.
In its own words, summarised: A carbon accounting platform for Scope 1, 2 and 3 emissions, with a named climate strategy adviser on each account.
In its own words, summarised: Carbon accounting software to measure, report and reduce a corporate carbon footprint.
In its own words, summarised: A sustainability services page within its UK advisory offer.
In its own words, summarised: An engineering, architecture and consultancy company working on sustainable solutions for governments and companies.
In its own words, summarised: Engineering consultancy in propulsion, driveline and energy systems.
In its own words, summarised: Environmental and engineering solutions; it says it was founded in 1989 as an environmental consultancy.
In its own words, summarised: Sustainability advisory, digital and technical services, from corporate sustainability strategy and energy transition to climate resilience.
In its own words, summarised: Climate consulting, carbon credits and project development: reporting, net zero planning, renewable procurement and Scope 3 work.
In its own words, summarised: An engineering and professional services firm combining engineering, advisory and science-based work.
Each description was read on the firm’s own site on 1 October 2026.
This site has assessed none of these firms, has no commercial relationship with any of them, and lists them in no order of merit.
The framework
The first four can be settled without talking to anyone, and they remove more suppliers than any ranking.
Only then compare firms on capability, scale and sector.
Public buyers may mean something else by a consultancy framework, a procurement agreement, which has its own section below.
| Criterion | The question to settle | What makes it matter |
|---|---|---|
| 1 · The obligation and its status | Which duty applies, and is it in force, comply or explain, voluntary or proposed? | PS26/19 ¶1.2 |
| 2 · The date | What date does the work have to support, and is it a statutory date or your own? | ESOS Phase 4: 5 Dec 2027 |
| 3 · Who must sign | Does any part need a registered or accredited signatory, and is that person or body named in the proposal? | ESOS reg 12 |
| 4 · Independence | If you plan certification or assurance, is the provider separate from whoever builds the work? | ISO/IEC 17021-1 cl. 5.2 |
| 5 · Method and ownership | Which standard and edition, and will you own the files, method and drafts at the end? | GHG Protocol |
| 6 · Scope in days | How many consultant days, at which grades, and what does year two cost? | Your own comparison |
| 7 · Evidence of the work | Named or redacted examples of the same obligation in a similar organisation. | Your own comparison |
The order is the point: two firms quoting for the same forty days against the same named obligation are comparable; two firms quoting for “ESG readiness” are not.
Status comes first because the market still sells deadlines that do not apply: UK SRS is voluntary for any company outside the FCA’s listing categories, and no threshold for private companies has been proposed.
Signatories come third because they are the only filter with a legal edge: the ESOS lead assessor must be on an approved register, and the undertaking carries the duty to check.
Independence matters only if you will seek certification or assurance, but it then constrains who can do the advisory work, so it has to be settled early.
Method and ownership decide whether year two costs less than year one, and whether you can change provider.
For listed companies, the useful next stop is the UK SRS readiness assessment.
Coverage
Every practice, from a large audit firm to a three-person boutique, sells some subset of these eight.
Reading a proposal is easier once you can see which it is quoting for.
| Service line | What you are buying | What bounds it |
|---|---|---|
| Carbon accounting | A Scope 1, 2 and 3 inventory with a documented boundary and method | The GHG Protocol standards; SECR for the UK statutory subset |
| Statutory reporting | The SECR disclosure, the climate-related financial disclosure, the ESOS notification | SI 2008/410 Sch 7; Companies Act s.414CB; SI 2014/1643 |
| Framework readiness | A gap analysis and plan against UK SRS, ESRS or IFRS | The standard text; for listed companies, the FCA’s comply-or-explain rules from 2027 |
| Strategy and targets | Materiality, a target, a transition plan | SBTi criteria where a target is to be validated |
| Environmental technical | Impact assessment, permitting, contaminated land, biodiversity net gain | Planning and environmental law, not reporting law |
| Energy and decarbonisation | Audits, retrofit appraisal, procurement, on-site generation | ESOS Phase 4 where you qualify |
| Supply chain and Scope 3 | Supplier engagement and category modelling | How much your suppliers will tell you |
| Systems and data | Platform selection and a data model that survives audit | Whether you actually need software rather than advice |
Two lines cause most disappointment because they are rarely scoped tightly: supply chain, bounded by supplier co-operation rather than consultant effort, and systems, bounded by the state of your finance and procurement data.
The lines a firm does not sell tell you what it will subcontract, and a subcontracted line is where a programme most often loses its audit trail.
If the eighth line is what you are really buying, compare tools before buying days: carbon reporting software and the ESG software comparison cover that market.
Public sector framework
In public procurement a consultancy framework is a framework agreement, and the one for environment and sustainability advice is Management Consultancy Framework Four, RM6309.
Its contract award notice lists ten lots, and Lot 9 is environment and sustainability.
The agreement runs from 29 July 2025 to 28 July 2027, two years with no extension, and it replaces MCF3 and the earlier restructuring and insolvency agreement.
The notice is published in the name of Crown Commercial Service, and the agreement page is now run by the Government Commercial Agency.
Suppliers commit to carbon reduction plans under PPN 006, and the pricing models on offer are time and materials, fixed price, and risk and reward.
Being on a lot says that a firm passed a procurement exercise for it; it is not a credential for the work, a ranking, or a statement by this site.
The agreement is available to the organisations on its authorised customer list, so a private buyer should read Lot 9’s published scope as a checklist rather than a route.
That scope is consultancy and professional services relating to environment and sustainability, which is the same ground as the eight service lines above.
Walk the talk
“Do they walk the talk?” is a fair question to put to any sustainability consultancy, and most of it can be tested without asking the firm anything.
The records are public: filed accounts and officers at Companies House, and statutory pay reporting on the gender pay gap service.
The same tests that apply to your company apply to the firm advising it: SECR scope, ESOS and, where it has 250 or more employees, the gender pay gap regulations.
A firm that sells experience at board level should be able to name the appointments, and the officer records at Companies House show whether they exist.
None of this measures how good the advice is, and this site has not run the checks on any firm in the directory.
Tick the steps in the panel as you complete them; nothing you tick is stored or sent.
Criterion three
The most useful filter in this market is not capability; it is whether the party in front of you may put its name to the thing you need signed.
UKAS accredits bodies, not consultants: its appointment and scope are set out in the DBT–UKAS memorandum, and consultancy is not among the activities it accredits.
Where verification is compulsory the rule is explicit: under the UK ETS the verifier must be accredited by UKAS to ISO 14065 and the Verification Regulation, for the activity reported.
SECR is the opposite case: the government’s guidelines say there is no legislative requirement for the figures to be independently assured, and no credential is needed to prepare them.
The verification standards are ISO 14064-1 for quantification, ISO 14064-3 for verification and validation, and ISO 14065 for the bodies, as a sector application of ISO/IEC 17029.
Pick a party in the panel to see what each may and may not sign, including this site, which signs nothing.
Advises, or can sign?
May
May not
ISO/IEC 17021-1:2015 cl. 5.2.5–5.2.7; IESSA; SBTi
Credentials
Of the credentials a UK sustainability consultancy can put on a proposal, the ESOS lead assessor registration is the one UK law requires.
Regulation 12 of the ESOS Regulations defines an approved register as one the scheme administrator has determined lists individuals meeting the PAS 51215:2014 competence standard.
The Environment Agency’s ESOS guidance names seven bodies keeping approved registers: the Association of Energy Engineers, CIBSE, Elmhurst Energy Systems, the Energy Institute, the Energy Managers Association, ISEP and Quidos.
Membership of one of the seven is not the same as being on its ESOS register, and the duty to check falls on the undertaking, according to the Phase 4 guidance.
The ESOS (Amendment) Regulations 2026, in force from 22 July 2026, added a personal duty on the lead assessor to notify their approval body within seven days of completing an assessment, and removed Display Energy Certificates and Green Deal Assessments as compliance routes.
Professional grades describe people: IEMA became the Institute of Sustainability and Environmental Professionals on 8 January 2025, and its post-nominals changed on 17 July 2025, so old letters on a proposal are out of date rather than invalid.
ISEP’s membership page distinguishes affiliate membership, an online sign-up, from professional grades that are assessed; an affiliate grade is not a competence credential.
Chartered Environmentalist status is awarded by the Society for the Environment, which says a master’s degree is not required if written work at an equivalent level is submitted.
Some badges confer less than they appear to: at the Science Based Targets initiative, target validation is done by SBTi Services, which says it does not offer consultation services, and the initiative’s FAQs describe how validation works.
CDP runs its own Accredited Solutions Provider programme for service providers; a CDP score, by contrast, describes a disclosing company’s response under CDP’s scoring bands, never its adviser.
Individual auditor certification also exists: CQI and IRCA certify lead auditors across a set of schemes, and that attaches to a person, not to the firm employing them.
Fees
No firm in the directory publishes a fee table and this site estimates none, so the useful comparison is the structure of a quote.
The government’s SECR evaluation measured a mean ongoing compliance cost of £7,100 a year, covering internal staff time and, for most compliers, external costs.
That is a cost of complying with one regime, not a price list for consultancy, and it is the only independent figure this page uses.
Compare fees by asking each shortlisted firm for days by grade and year two in the same proposal, against the same named obligation.
Two proposals for “ESG readiness” cannot be compared; two for the same forty days against ESOS Phase 4 can.
How the work runs
Almost every sustainability engagement runs in the same order, whatever the firm calls its phases.
Scope fixes the obligation and date, baseline builds the measurement, gap analysis compares it with the standard, remediation closes the gaps, disclosure writes it down, and handover decides who does year two.
Ask for elapsed time and consultant days separately for each stage, because they are priced differently and no regulator publishes a timetable.
Each stage below names the provision it rests on and the question to put in writing.
Name the duty, its status and the date the work must support, before anyone quotes.
Ask: which of our obligations is in force, which is comply or explain and which is voluntary?
Who does it: you, with the adviser testing your reading of the instrument.
Set the boundary and method and build the inventory or audit the disclosure will rest on.
Ask: which standard and edition, and will we own the files and the method at the end?
Who does it: the adviser builds; you supply data and approve the boundary.
Read the disclosure requirements against what you can show today.
Ask: how many consultant days, at which grades, and what is in the gap list?
Who does it: shared; the output is a list you can act on without the adviser.
Change the processes, controls or data flows that the gap analysis found.
Ask: which actions are yours, and what will make this harder than a standard engagement in our sector?
Who does it: mostly you; this is the change programme.
Draft the statement for the document that carries it, and have the right person sign.
Ask: who signs, and who checks the signatory against the register?
Who does it: you are liable for the words; the adviser drafts.
Move the year-two work in-house and decide whether any assurance will be sought, and from whom.
Ask: who inside our organisation can produce next year’s numbers without you?
Who does it: you; any assurance provider must be separate from whoever built the work.
What changed on 30 September 2026
The FCA’s final rules changed the position that many consultancy proposals were written against.
Simplified for illustration; sources: FCA PS26/19 · CP26/5.
For a buyer the change is practical: a proposal priced on mandatory S2 deadlines for a listed company is priced on the consultation, not the rules.
A company using a relief states that it is doing so and needs give no further explanation during the relief period, according to PS26/19.
For every company outside the five listing categories UK SRS remains voluntary, and a gap analysis is worth doing early only if you intend to use it.
Criterion one
Run your figures through the checker before any call; it tests eight UK duties independently, each against its own instrument.
The tests genuinely do not line up: ESOS uses a different size test from SECR, the climate disclosure duty has a 500-employee floor, and UK SRS turns on listing category rather than size.
For a listed company in scope, the FCA’s final rules mean UK SRS on a comply-or-explain basis from periods beginning on or after 1 January 2027; the consultation, CP26/5, had proposed mandatory S2 and that was not adopted.
For anyone else UK SRS remains available for voluntary use, and the standards themselves carry no effective date, because the government removed those provisions so that timing could be set by law or the FCA (government response).
The regimes have their own pages: UK SRS S1 and S2, the SECR reporting guide, SECR requirements, climate-related financial disclosures and ESOS Phase 4.
Nothing here is legal advice; where a threshold is close, confirming it costs less than building the wrong disclosure.
One year’s figures · eight UK duties
5 of 8 tests point to a duty on these figures.
No UK SRS duty for this category or for an unlisted entity.
The standards remain available for voluntary use.
Fewer than two conditions are met, so these figures point to a SECR duty: UK energy, emissions and an intensity ratio in the directors’ report.
At or under the 500-employee floor, which applies to every limb, so this duty does not arise.
The large-undertaking test is met.
For Phase 4 it is taken on 31 December 2026 across the UK group, with compliance notified by 5 December 2027.
Total turnover is not less than £36 million, so a supplier of goods or services publishes a slavery and human trafficking statement each financial year.
Subsidiaries’ turnover counts.
250 or more employees: a private or voluntary-sector employer publishes six figures within 12 months of the 5 April snapshot date.
The count is taken on that date, not as an average.
Larger than medium-sized on these figures, so the strategic report includes a statement of how the directors had regard to s.172(1)(a)–(f), including the environment.
Not applicable: the Code reaches the commercial companies and closed-ended investment funds categories only.
One year, one entity, literal readings.
It does not aggregate groups, apply the two-year rules or the ESOS snapshot date.
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Standards in 2026
| Instrument | Status at 1 October 2026 | What it turns on |
|---|---|---|
| SECR | In force | Quoted companies at any size; unquoted companies on SECR’s own “not more than” exemption test, which the 2025 Companies Act uplift did not reach |
| ESOS Phase 4 | In force | At least 250 employees, or turnover over £44m and balance sheet over £38m; qualification 31 December 2026, compliance 5 December 2027 |
| Climate disclosure, CA 2006 s.414CB | In force | Traded, banking, insurance, AIM and high-turnover companies with more than 500 employees |
| UK SRS S1 and S2 | Voluntary; comply or explain for listed companies in scope | FCA PS26/19: periods beginning on or after 1 January 2027 |
| CSRD after Omnibus I | In force in the EU from 18 March 2026 | More than 1,000 employees and €450m turnover, cumulatively; Article 40a for third-country groups |
| GHG Protocol | Operative; being consolidated with ISO | The 2004 Corporate Standard and 2011 Scope 3 Standard stay in effect |
| PAS 2060 | Withdrawn | Verification ceased 1 January 2025; last opinions by end-2025 |
| ISO 14068-1:2023 | Withdrawn 11 September 2026 | Revised by ISO 14068:2026 |
| ISO 14001:2015 | Withdrawn | ISO 14001:2026 published 15 April 2026 |
A firm that cannot say which of these is which on a first call will not get the sequencing right on the engagement.
The changes most often missed are the two neutrality standards: BSI’s note on PAS 2060 keeps opinions issued before withdrawal valid for their own period, but none can be issued now, and its successor ISO 14068-1:2023 was itself withdrawn on 11 September 2026.
ISO 14001:2015 was withdrawn when ISO 14001:2026 was published on 15 April 2026; ask your certification body about transition rather than a consultant.
The GHG Protocol’s 29 July 2026 announcement of a single standard with ISO is a consultation date, Q2 2027, not a publication date.
The neutrality question is covered on PAS 2060 and ISO 14068.
ESOS consultants
ESOS is the one regime where UK law names a credentialed adviser, so it is where a consultant’s status matters most.
The approved register test, the seven-day notice and the Phase 4 guidance are the three places to check a consultant’s ESOS claim.
Our ESOS Phase 4 compliance guide covers the scheme in full.
Assurance
Measurement, disclosure and change are three purchases; assurance is a fourth, with its own standards, independence rules and, generally, its own supplier.
No UK law requires sustainability assurance, and the FCA’s rules do not either: where a listed company obtains it, PS26/19 ¶2.45 asks it to name the provider, the disclosures assured and the standards used.
The FRC issued ISSA (UK) 5000 for voluntary use; a practitioner who claims compliance with it is bound by it.
The market often says a firm cannot prepare and assure the same information; what the IESBA overview states is a bar on assuming management responsibility for any client, and a general prohibition on self-review services for public interest entities.
For other clients the standards require the threat to be evaluated and safeguarded, so ask “what threats does this create, and what safeguards apply?”.
The government’s response on an oversight regime set out a voluntary regime with an interim register run by the FRC; this site has seen no announcement that it is open, so a claim to be on it is worth checking.
The sustainability assurance guide covers the detail.
| Instrument | Status |
|---|---|
| ISSA 5000 (IAASB) | Published 12 November 2024; periods beginning on or after 15 December 2026; covers limited and reasonable assurance |
| ISSA (UK) 5000 (FRC) | Issued 12 November 2025 for voluntary use; same effective date |
| ISAE 3410 | Withdrawn from ISSA 5000’s effective date |
| IESSA (IESBA) | Released 17 January 2025; effective 15 December 2026 |
Claims in proposals
Each card ties the claim to the instrument or the publisher’s own wording, so a question in the invitation can cite it.
A claim a firm cannot source to a provision is a marketing statement, whatever badge sits beside it.
The same applies to the neutrality standards and the assurance rules, which each have their own page.
Insurance and liability
Insurance is a procurement question as much as a legal one, and it is one a proposal rarely volunteers.
GOV.UK says an employer must hold employers’ liability insurance covering at least £5 million, from an authorised insurer.
An employer without cover can be fined £2,500 for each day it is uninsured.
Cover for the advice itself, such as professional indemnity, is for your contract to set.
State the level you require in the invitation, ask for the certificate, and check that the policy names the entity you are contracting with.
This site gives no view on any firm’s cover and has seen no firm’s certificate.
Supply chain consulting
Supply chain sustainability consulting is mostly Scope 3 work, and the Standard that defines it names fifteen categories to screen.
The GHG Protocol Scope 3 Standard splits them into eight upstream categories and seven downstream.
The method is a screening judgement first and a data collection second: decide which categories dominate, then ask the suppliers behind them.
The result depends on what suppliers will tell you, so ask any firm what happens to the estimate if they do not respond.
A supplier audit is a different purchase from a Scope 3 inventory, because an audit tests a supplier’s practices at a site while the inventory estimates emissions across your value chain.
A customer in the EU asking for value-chain data meets the post-Omnibus cap: Directive (EU) 2026/470 lets undertakings of 1,000 employees or fewer decline information beyond the voluntary standards.
Who is buying
“Corporate sustainability consulting” is the same work bought by finance or strategy rather than by an environment function, and what changes is the evidence the buyer will accept.
An environment or HSE function wants technical method and an audit trail; finance and the audit committee want controls and something that reconciles to the accounts; procurement answering a questionnaire wants the cheapest credible answer in the format asked.
“Environmental consultancy” is a different market: site- and project-bounded work under planning and environmental law, read by a regulator or planning authority, rather than entity-level disclosure read by investors.
A genuinely multidisciplinary firm has both benches in-house; ask which people on the proposal are its own employees.
At enterprise scale the hard part becomes consolidation: entities joining and leaving the group, many sites with their own conventions, and several regimes on different boundaries and calendars.
The answer there is one dataset mapped to each regime, rather than one programme per regime, and a written consolidation policy.
A mid-market company usually has one obligation, one customer questionnaire and no specialist, and is the segment most likely to be sold a programme it does not need.
Check first whether SECR’s exemption test leaves it in scope, then whether ESOS catches it, and only then whether anything voluntary is worth doing.
A customer in the EU asking for value-chain data meets the post-Omnibus cap: Directive (EU) 2026/470 lets undertakings of 1,000 employees or fewer decline information beyond the voluntary standards.
Reach and location
International reach matters in three situations: an EU subsidiary or branch large enough to bring CSRD into play, primary data held abroad, or a parent elsewhere whose consolidated figures your disclosure must match.
Outside those, an international network is overhead, and a UK practice can produce the same disclosure.
Where the EU limb does apply you are writing two documents, because ESRS uses double materiality and UK SRS does not; CSRD versus UK SRS and the CSRD Omnibus page explain the difference.
Location matters for site work — energy audits, ESOS visits, ecology — where somebody has to attend and travel is billed, and barely at all for reporting, where the data comes from your systems.
Splitting the brief, site work near the estate and disclosure work wherever the reporting skills are, is a legitimate way to buy.
By subject
Sustainability reporting is the most precisely buyable line: a document for a named reader, by a named date, against a named standard.
SECR goes in the directors’ report every year (see the government’s SECR guidance); the climate disclosure in the strategic report under section 414CB; UK SRS alongside the financial statements for those who use it; ESOS in a notification to the Environment Agency, not the annual report.
Ask a reporting consultant for a redacted example and which parts you should write yourselves — the governance narrative is nearly always better written internally.
“ESG consultancy” widens the brief to governance and social subjects, with their own advisers and standards; the ESG consultant guide covers that market.
Carbon has the most established method and the clearest test of competence; a validated target, a verified inventory and a neutrality claim are three different things with three different providers.
Governance is the section a consultancy should mostly not write for you: it can design arrangements — terms of reference, an agenda item, a reporting line — but the disclosure has to describe what actually exists.
“Strategy” covers everything from a materiality matrix to a capital plan; the deliverable that has a standard behind it is the transition plan, covered on UK SRS transition plans and climate transition plans.
A transition plan without dated, owned and costed actions is a communications document.
Buy the measurement before the strategy: a target set against a baseline that later moves has to be reset, and so does every plan built on it.
For financial services, financed emissions and climate disclosures sit with green finance and IFRS S2.
Build or buy
The honest comparison is recurring against one-off: software earns its licence where the same task repeats with new data; consultancy earns its fee where a judgement is made once.
Collecting meter and fuel data every month is a software or spreadsheet task, not consultant days.
Setting the boundary and method is a one-off judgement worth paying for, if it is documented so that you own it.
Drafting the disclosure is consultancy in year one and internal work from year two, if the handover was scoped.
Supplier engagement for Scope 3 is neither: it is category management with a carbon lens, which your buyers already know how to run.
Buying a platform before the method exists is buying an expensive place to store an argument you have not had.
In practice
Put the questions in the invitation, not the meeting: written answers can be compared and a good meeting cannot.
Which of our obligations is in force, which is comply or explain, and which is voluntary?
Who on this proposal is your employee?
At the end, who inside our organisation can produce next year’s numbers without you?
How many consultant days, at which grades?
What will make this harder than a standard engagement in our sector?
If we later want assurance, who provides it, and does your involvement affect that?
The panel assembles a draft brief and question list; the full process is in how to choose a sustainability consultant.
Write the brief
A starting draft, not advice. It names no provider.
Nothing you choose or type is stored or sent.
Or hire
If the work repeats every year, a permanent role may fit better than a retainer.
The roles are described on sustainability director, ESG manager and chief sustainability officer, with pay on UK sustainability consultant salaries.
The recruiters are compared in the recruitment and assessment list, and the career itself on how to become a sustainability consultant.
About this page
This page explains how to choose; it does not choose for you, and no firm’s position on it means anything.
Every regulatory statement is cited to its instrument; the firm descriptions come from the firms’ own sites and have not been checked by us.
If you want to talk your obligation through before writing a brief, you can book a free 15-minute call.
How we handle what you send us is in the privacy policy, and the terms of use in the terms of service.
Identity
uksrs.org.uk is an independent reference published by Fractional Quest Ltd, Company No. 17322105, 71–75 Shelton Street, London WC2H 9JQ.
It certifies, verifies, assures and signs nothing, holds no accreditation and is on no approved register.
Corrections: hello@uksrs.org.uk
Further reading
The government’s 2026 post-implementation review of SECR and its evaluation of the regulations are the primary evidence on how SECR has worked and what it costs.
The GHG Protocol Corporate Standard remains the inventory standard that most carbon accounting engagements are scoped against.
The standards themselves, UK SRS S1 and S2, are published by the Department for Business and Trade for voluntary use.
Many reporting engagements are bought by finance, and the accountancy bodies keep their own hubs: ICAEW and ACCA.
Environmental technical work such as biodiversity net gain follows planning law, not reporting law.
Frequently asked
This site does not rank firms and has assessed none of them.
“Best” depends on the obligation you are closing, its date, who must sign the result and whether you keep the files.
The directory here lists firms alphabetically and describes each only from its own site; use the criteria to build your own shortlist.
A way of choosing a provider by your own position rather than by the firms’ size: establish which obligations apply and their status, put a date on each, decide what must be signed and by whom, size the work in days, and only then compare firms on capability and sector.
A sustainability consultancy sells three things: a measurement you do not have, a disclosure you cannot yet write, and a change programme someone has to run.
Underneath sit eight service lines, from carbon accounting and statutory reporting to supply chain work and systems.
For most of the work, none.
The exceptions are ESOS, where the assessment must be reviewed by a lead assessor on one of the approved registers, and the UK ETS, where the verifier must be accredited by UKAS.
No credential is required to prepare a SECR disclosure.
Not the same work.
ISO/IEC 17021-1 stops a certification body offering management system consultancy, and the IESBA standards bar a sustainability assurance practitioner from assuming management responsibility for a client and generally prohibit self-review services for public interest entities.
No firm in the directory publishes a fee table, and this site does not estimate one.
Ask each shortlisted firm for days by grade and year two in the same proposal.
The one independent measure is the government’s for SECR: a mean ongoing compliance cost of £7,100 a year.
For listed companies in UKLR 6, 14, 15, 16 and 22, the FCA’s final rules require reporting against UK SRS on a comply-or-explain basis for periods beginning on or after 1 January 2027.
For everyone else UK SRS is voluntary.
A gap analysis is worth doing early; a premium priced on mandatory deadlines that do not apply to you is not.
Choose on the work, not the brand.
Scale and audit adjacency matter where a disclosure must reconcile to audited accounts across several regimes and countries.
Elsewhere a specialist or regional firm may do the same work.
Check independence if you plan to have the result assured.
It depends on the scope, and no regulator publishes a timetable.
The sequence is consistent: scope, baseline, gap analysis, remediation, disclosure and the repeat cycle.
Ask for elapsed time and consultant days separately, because they are priced differently.
No new opinions can be issued: BSI stopped delivering the scheme from 1 January 2025 and the last opinions were issued by the end of 2025.
ISO 14068-1:2023, which replaced it, was withdrawn on 11 September 2026 and is being replaced by ISO 14068:2026.
No credential is needed to prepare a SECR disclosure, and the government’s guidelines say there is no legislative requirement for the figures to be independently assured.
A consultant is a choice about capacity and method, not a legal requirement.
Quoted companies are in scope at any size; for an unquoted company it turns on the exemption test in Schedule 7 paragraph 20B of SI 2008/410.
ESOS needs a lead assessor on one of the seven approved registers to review the assessment, and the duty to check that registration falls on your undertaking.
The assessment itself can be carried out in different ways; what the law fixes is who must review it and who notifies the Environment Agency.
The Phase 4 compliance date is 5 December 2027, with the qualification date on 31 December 2026.
The work overlaps, but ESG consulting widens the brief to governance and social subjects, with their own advisers and standards.
Sustainability consulting in the UK market usually starts from the environmental and climate obligations: carbon accounting, SECR, ESOS and climate disclosure.
Check which obligation a proposal is quoting for, not which label it uses.
Environmental consultancy is usually site- and project-bounded work under planning and environmental law, read by a regulator or planning authority.
Sustainability consultancy is usually entity-level work read by investors, lenders or customers.
A multidisciplinary firm may sell both, so ask which people on the proposal are its own employees.
This site does not rank firms.
Start from your status: for listed companies in UKLR 6, 14, 15, 16 and 22 the FCA’s final rules mean comply or explain from periods beginning on or after 1 January 2027, and for everyone else UK SRS is voluntary.
Then use the seven criteria and ask each shortlisted firm the same written questions.
This site ranks no firm and has assessed none.
Published rankings measure different things: Verdantix assesses providers’ capabilities against its own criteria, Consultancy.uk bands firms by its own method, and Environment Analyst reports size and growth behind membership.
Use them as evidence about a firm, then apply the seven criteria to your own shortlist.
Size does not change the obligation: ESOS still needs a lead assessor on an approved register, and a UK ETS verifier still has to be accredited by UKAS.
Judge a smaller firm on the same seven criteria, check that the people named on the proposal are its own employees, and ask to see its insurance certificate.
Location matters for site work, such as energy audits, ESOS visits and ecology, where someone has to attend and travel is billed, and barely at all for reporting, where the data comes from your systems.
Splitting the brief, site work near the estate and disclosure work wherever the reporting skills are, is a legitimate way to buy.
Management Consultancy Framework Four, RM6309, is a framework agreement run by the Government Commercial Agency from 29 July 2025 to 28 July 2027, with ten lots.
Lot 9 covers environment and sustainability and lists 43 suppliers of the agreement’s 219.
Being on it means a firm passed a procurement exercise for that lot; it is not a ranking of firms or a credential for the work.
GOV.UK says an employer must hold employers’ liability insurance covering at least £5 million, from an authorised insurer, and an employer without it can be fined £2,500 for each day it is uninsured.
Cover for the advice itself, such as professional indemnity, is for your contract to set, so state the level you require in the invitation and ask to see the certificate.
Use public records.
Read the accounts at Companies House, check whether the firm is in SECR or ESOS scope and has met its own duties, search its gender pay gap report on the government’s service if it has 250 or more employees, and check the appointments behind any claim of board experience.
Ask for the method and boundary behind any emissions figure the firm publishes.
Mostly Scope 3 work: screening the fifteen categories in the GHG Protocol’s Scope 3 Standard, deciding which dominate and engaging the suppliers behind them.
The estimate depends on what suppliers will tell you.
A supplier audit is a different purchase, testing a supplier’s practices at a site rather than estimating emissions across your value chain.
Software earns its licence where the same task repeats with new data, and consultancy earns its fee where a judgement is made once, such as setting the boundary and method.
Buying a platform before the method exists buys an expensive place to store an argument you have not had.
Some do, but the UK duties are separate.
After Omnibus I the CSRD applies to undertakings with more than 1,000 employees and €450 million of turnover, cumulatively, with Article 40a for third-country groups, and ESRS uses double materiality where UK SRS does not.
Ask whether the CSRD scope in a proposal is actually yours.
Sources
Every figure, date and status on this page traces to the instrument’s owner.
Secondary commentary is never the source for a number.
A certification body may not offer management system consultancy.
UKAS accredits conformity assessment bodies; consultancy is outside its scope.
The verifier must be accredited by UKAS to ISO 14065 and the Verification Regulation.
No legislative requirement for SECR figures to be assured.
What an approved register is.
The seven bodies keeping approved registers.
In force 22 July 2026: the lead assessor’s seven-day notice; DECs and Green Deal routes removed.
The undertaking’s duty to check its lead assessor.
Published 25 February 2026 for voluntary use.
Why the effective-date provisions were removed.
Comply or explain across UK SRS for periods beginning on or after 1 January 2027.
Proposed mandatory S2; not adopted.
The unquoted-company exemption test.
The climate-related financial disclosure duty.
Withdrawn.
The scheme dates, and why earlier opinions stay valid for their period.
Withdrawn 11 September 2026; revised by ISO 14068:2026.
Withdrawn when ISO 14001:2026 was published.
15 April 2026.
Organisation-level quantification; marked to be revised.
Verification and validation of greenhouse gas statements.
Bodies validating and verifying environmental information.
One co-branded corporate standard with ISO; consultation planned for Q2 2027.
The fifteen Scope 3 categories.
Published 12 November 2024; periods beginning on or after 15 December 2026.
Takes effect from ISSA 5000’s effective date.
Issued for voluntary use.
Issue of ISSA (UK) 5000.
Released 17 January 2025, effective 15 December 2026.
Management responsibility and self-review.
A voluntary regime and an interim FRC register.
The name change and new post-nominals.
Affiliate sign-up against assessed professional grades.
The competences and the master’s-level equivalence.
SBTi Services validates and does not offer consultation services.
CDP’s own provider programme.
1,000 employees and €450 million, cumulative; Article 40a; the value-chain cap.
The government’s 2026 review of SECR; SECR is retained.
The government’s evaluation of SECR’s operation, impact and cost-effectiveness.
What SECR asks of a company and where it is reported.
An example of environmental technical work governed by planning law, not reporting law.
The corporate-level inventory standard still in effect.
Published 25 February 2026 for voluntary use.
The accountancy body’s hub for finance professionals working on sustainability reporting.
The second accountancy hub; many reporting engagements sit with the finance function.
Ten lots; Lot 9 is environment and sustainability. The agreement runs 29 July 2025 to 28 July 2027.
The ten lots, the replacement of MCF3 and the scope as published.
The carbon reduction plan requirement MCF4 suppliers commit to.
Cover of at least £5 million from an authorised insurer; a fine of £2,500 for each day without it.
Filed accounts, directors and registered office for any UK company.
Search an employer’s statutory gender pay gap report; employers with 250 or more employees must file.
Who must report and what the report contains.
The government’s own measure of what SECR compliance costs: a mean ongoing £7,100 a year.