Company lists · Data refreshed September 2026

Top 25 Carbon verification companies based in the United Kingdom

Name: Carbon verification companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 100 companies tracked

RevenueBase identified 100 carbon verification companies headquartered in the United Kingdom as of September 2026 and tracks 2,163 professional contacts across them, including 887 with verified work emails. London is the largest hub.

This list covers carbon verification companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

100Companies

2,163Contacts tracked

887Verified emails

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The 25 largest carbon verification companies based in the United Kingdom

Ranked by team size

Top 25 of 100 carbon verification companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to carbon verification companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Achilles Information Limited	Partial evidence	Abingdon, United KingdomHQ checked Sep 19, 2026	501-1,000	836 contacts →
	Partial evidence “For more than 30 years, Achilles has protected organisations’ business interests and reputations by providing unrivalled levels of supply chain transparency, carbon reduction and…” Source: RevenueBase Database · checked Sep 19, 2026
2	NQA	Indirect evidence	Dunstable, United KingdomHQ checked Sep 19, 2026	501-1,000	267 contacts →
	Indirect evidence “NQA is a leading global certification body, respected for providing flexible and supportive certification and training services that are technically advanced and meet the needs of…” Source: RevenueBase Database · checked Sep 19, 2026
3	Stroma Certification	Indirect evidence	Wakefield, United KingdomHQ checked Sep 19, 2026	201-500	128 contacts →
	Indirect evidence “Elmhurst Energy and Stroma Certification have merged.” Source: RevenueBase Database · checked Sep 19, 2026
4	ERM CVS	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	100 contacts →
	Partial evidence “ERM CVS provides science-based, independent assurance, verification certification and training services for the world’s leading organizations.” Source: RevenueBase Database · checked Sep 19, 2026
5	Kinto Join Limited	Partial evidence	Epsom, United KingdomHQ checked Sep 19, 2026	51-200	61 contacts →
	Partial evidence “We help organisations understand, measure, and meaningfully reduce their environmental impact through a unique combination of expert consultancy, advanced carbon accounting…” Source: RevenueBase Database · checked Sep 19, 2026
6	Evident	Indirect evidence	Sheffield, United KingdomHQ checked Sep 19, 2026	11-50	60 contacts →
	Indirect evidence “The Xpansiv I-REC Registry (previously Evident) is the world's most widely used registry of environmental assets, serving more than organizations in over 140 countries.” Source: RevenueBase Database · checked Sep 19, 2026
7	International Associates Limited	Partial evidence	Glasgow, United KingdomHQ checked Sep 19, 2026	51-200	50 contacts →
	Partial evidence “International Associates (IA) is a leading provider of assessment, audit, verification, certification and training services.” Source: RevenueBase Database · checked Sep 19, 2026
8	Carbonchain	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	42 contacts →
	Partial evidence “CarbonChain's platform enables companies to track, report and reduce their supply chain emissions, covering the most carbon-intensive industries (metals and mining, agriculture…” Source: RevenueBase Database · checked Sep 19, 2026
9	Metsims Sustainability Consulting	Partial evidence	Oxford, United KingdomHQ checked Sep 19, 2026	11-50	34 contacts →
	Partial evidence “Based in Oxford, UK and in Istanbul, Turkey, Metsims is the leading sustainability consultancy specialised in life cycle assessment (LCA), corporate and product carbon footprint…” Source: RevenueBase Database · checked Sep 19, 2026
10	SCS Sustainable Construction Services	Indirect evidence	Bristol, United KingdomHQ checked Sep 19, 2026	11-50	31 contacts →
	Indirect evidence “We believe that if you understand your environmental targets, you will have a better understanding of their real-world impacts.” Source: RevenueBase Database · checked Sep 19, 2026
11	Hamerkop Climate Impacts	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	29 contacts →
	Indirect evidence “HAMERKOP IS AN ENABLER - AN INDEPENDENT TECHNICAL CONSULTANCY OPERATING WORLDWIDE.” Source: RevenueBase Database · checked Sep 19, 2026
12	Simply Certification	Indirect evidence	Jarrow, United KingdomHQ checked Sep 19, 2026	1-10	21 contacts →
	Indirect evidence “The certification body of choice for the built environment.” Source: RevenueBase Database · checked Sep 19, 2026
13	ERM Previously ESC	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	20 contacts →
	Indirect evidence “This page has closed” Source: RevenueBase Database · checked Sep 19, 2026
14	Esgmark	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	18 contacts →
	Indirect evidence “ESGmark® helps organisations credibly demonstrate, measure, and improve their Environmental, Social, and Governance (ESG) performance.” Source: RevenueBase Database · checked Sep 19, 2026
15	Teamwork IMS	Indirect evidence	Reading, United KingdomHQ checked Sep 19, 2026	11-50	15 contacts →
	Indirect evidence “Teamwork IMS is a leading provider of Compliance and Sustainability solutions to a wide range of business sectors worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
16	CSR Accreditation	Indirect evidence	High Wycombe, United KingdomHQ checked Sep 19, 2026	1-10	15 contacts →
	Indirect evidence “Social Responsibility allows you to enrich the quality of lives for all by investing in social value as an essential part of an organisations culture.” Source: RevenueBase Database · checked Sep 19, 2026
17	carbon.climate.certified	Partial evidence	Leeds, United KingdomHQ checked Sep 19, 2026	1-10	14 contacts →
	Partial evidence “Carbon.Climate.Certified offer a holistic and pragmatic range of services to the corporate and built environment sector, including environmental assessment and certification…” Source: RevenueBase Database · checked Sep 19, 2026
18	Glocert International	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “Glocert International is an emerging leader in the Testing, Inspection and Certification (TIC) industry.” Source: RevenueBase Database · checked Sep 19, 2026
19	MSS Global	Indirect evidence	Cartmel, United KingdomHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “MSS Global - UKAS Accredited Certification Body (CB) with specialism in assurance of ethical management practices, environmental-social-governance (ESG) assurance, and management…” Source: RevenueBase Database · checked Sep 19, 2026
20	Carbonfit	Partial evidence	Belfast, United KingdomHQ checked Sep 19, 2026	11-50	12 contacts →
	Partial evidence “carbonfit provides your business with a one-stop solution to reduce carbon emissions by centralising energy and carbon data, highlighting hotspots and streamlining mandatory…” Source: RevenueBase Database · checked Sep 19, 2026
21	Carbon Responsible Part Of Simply Sustainable	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	12 contacts →
	Partial evidence “We are Carbon Responsible (part of Simply Sustainable): empowering businesses to confidently drive real carbon reduction.” Source: RevenueBase Database · checked Sep 19, 2026
22	Lucideon Cics	Indirect evidence	Stoke On Trent, United KingdomHQ checked Sep 19, 2026	11-50	12 contacts →
	Indirect evidence “Lucideon CICS Limited provides sustainability assurance, management systems certification, product certification and training Assurance Services include third party independent…” Source: RevenueBase Database · checked Sep 19, 2026
23	Neutral Carbon Zone	Partial evidence	Milton Keynes, United KingdomHQ checked Sep 19, 2026	11-50	12 contacts →
	Partial evidence “NCZ is the ultimate carbon management and certification platform, enabling clients to achieve carbon neutrality across all phases of their sustainability program.” Source: RevenueBase Database · checked Sep 19, 2026
24	Ashby Energy Assessors	Indirect evidence	Melton Mowbray, United KingdomHQ checked Sep 19, 2026	11-50	9 contacts →
	Indirect evidence “Established in 2007 by our Senior Assessor Glenn Shewan, a trained Engineer, Ashby Energy Assessors emerged from the recognition of a pressing need for an energy assessment…” Source: RevenueBase Database · checked Sep 19, 2026
25	Futureproof	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	9 contacts →
	Indirect evidence “Futureproof is a one-stop shop for companies and consultants to manage their sustainability.” Source: RevenueBase Database · checked Sep 19, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: carbon verification companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names carbon verification companies.
Partial evidence: Its own public description names part of carbon verification companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name carbon verification companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 100 carbon verification companies based in the United Kingdom

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Carbon verification companies based in the United Kingdom at a glance

As of Sep 19, 2026

41.0%Verified-email coverage

21.6Average contacts per company

1-10Median size (employees)

37.0%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 100 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among carbon verification companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “carbon verification companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names carbon verification companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among carbon verification companies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 887 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Carbon verification companies by metro

Carbon verification companies in London37

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names carbon verification companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many carbon verification companies are there based in the United Kingdom?

RevenueBase identified 100 carbon verification companies headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Achilles Information Limited, headquartered in Abingdon, tops this list with the largest team on record.

Which city has the most carbon verification companies?

London leads with 37 headquartered companies, followed by Belfast (3) and Cheltenham (2).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 887 verified decision-maker contacts tracked across these 100 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.