Company lists · Data refreshed September 2026

Top 25 Building decarbonization companies based in London, United Kingdom

Name: Building decarbonization companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 330 companies tracked

RevenueBase identified 330 building decarbonization companies headquartered in London, United Kingdom as of September 2026 and tracks 13,712 professional contacts across them, including 6,823 with verified work emails. London is the largest hub.

This list covers building decarbonization companies headquartered in London, 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 16, 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 16, 2026 86% judged on-target in blind review

330Companies

13,712Contacts tracked

6,823Verified emails

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The 25 largest building decarbonization companies based in London, United Kingdom

Ranked by team size

Top 25 of 330 building decarbonization companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to building decarbonization 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	Faithful Gould	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	1,194 contacts →
	Indirect evidence “Faithful+Gould is now AtkinsRéalis.” Source: RevenueBase Database · checked Sep 16, 2026
2	Hoare LEA	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	1,103 contacts →
	Indirect evidence “We are an award-winning engineering consultancy with a creative team of engineers, designers, and technical specialists.” Source: RevenueBase Database · checked Sep 16, 2026
3	Dalkia UK	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	5,001-10,000	1,064 contacts →
	Indirect evidence “Together, we’re delivering technical solutions for a better society and an Electric Britain Dalkia is one of the UK’s leading technical and energy services providers at the…” Source: RevenueBase Database · checked Sep 16, 2026
4	Penspen	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	1,007 contacts →
	Indirect evidence “Penspen designs, maintains, and optimises energy infrastructure to improve access to secure and sustainable energy for communities worldwide.” Source: RevenueBase Database · checked Sep 16, 2026
5	Bellrock Group	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	755 contacts →
	Indirect evidence “As property experts, we’re committed to optimising real estate for the demands of today and tomorrow by transforming property into sustainable, high-performance estates.” Source: RevenueBase Database · checked Sep 16, 2026
6	Atelier TEN	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	323 contacts →
	Partial evidence “As environmental design consultants, building services engineers and lighting designers, we are committed to high performance and sustainable design within the built environment.” Source: RevenueBase Database · checked Sep 16, 2026
7	TFT	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	250 contacts →
	Partial evidence “TFT is an independent commercial building consultancy which places the performance of buildings and the wellbeing of people at the heart of its work.” Source: RevenueBase Database · checked Sep 16, 2026
8	MAX Fordham LLP	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	208 contacts →
	Indirect evidence “Max Fordham LLP is a partnership of engineers, designers and consultants, working with the built environment, to deliver a sustainable future and a thriving planet.” Source: RevenueBase Database · checked Sep 16, 2026
9	Carbon Clean	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	188 contacts →
	Indirect evidence “Carbon Clean is the point-source carbon capture expert, driving the decarbonisation of hard-to-abate industries for more than 15 years.” Source: RevenueBase Database · checked Sep 16, 2026
10	CFP Energy	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	171 contacts →
	Indirect evidence “CFP Energy is a leading provider of energy and environmental solutions for industrial and commercial clients.” Source: RevenueBase Database · checked Sep 16, 2026
11	Pareto Facilities Management LTD	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	150 contacts →
	Indirect evidence “Pareto Facilities Management.” Source: RevenueBase Database · checked Sep 16, 2026
12	Bring Energy	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	125 contacts →
	Indirect evidence “We are Bring Energy.” Source: RevenueBase Database · checked Sep 16, 2026
13	Mitie Energy	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	125 contacts →
	Indirect evidence “Mitie Energy are an award-winning, UK-based energy, utilities and sustainability solutions business.” Source: RevenueBase Database · checked Sep 16, 2026
14	ZTP	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	115 contacts →
	Indirect evidence “At ZTP, we’re committed to accelerating the transition to a more sustainable future by reducing the negative impact of human activity on our planet - ecologically, financially…” Source: RevenueBase Database · checked Sep 16, 2026
15	Longevity Partners	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	115 contacts →
	Indirect evidence “Longevity Partners is a multidisciplinary energy and sustainability consultancy.” Source: RevenueBase Database · checked Sep 16, 2026
16	First Mode	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	93 contacts →
	Partial evidence “First Mode develops and manufactures decarbonization solutions for heavy industry partners dedicated to the clean energy future.” Source: RevenueBase Database · checked Sep 16, 2026
17	Sustainable Advantage	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	89 contacts →
	Indirect evidence “Sustainable Advantage partners with Private Equity funds and businesses across the UK, France, and wider Europe.” Source: RevenueBase Database · checked Sep 16, 2026
18	Alfa Energy An Edison Energy Company	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	88 contacts →
	Indirect evidence “Alfa Energy Group (an Edison Energy company) is an international energy, sustainability and technology consultant partner with 200 employees over four international locations.” Source: RevenueBase Database · checked Sep 16, 2026
19	Purdy Part Of Sureserve	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	85 contacts →
	Indirect evidence “Who are we?” Source: RevenueBase Database · checked Sep 16, 2026
20	Xco2	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	84 contacts →
	Partial evidence “We are a multidisciplinary group with backgrounds in engineering, architecture and environmental science, working as consultants for buildings, large developments and masterplans…” Source: RevenueBase Database · checked Sep 16, 2026
21	AMD Group	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	82 contacts →
	Indirect evidence “AMD Environmental are a collaborative Mechanical and Electrical Design and Build Engineering specialist with a sustainable approach in delivering challenging and bespoke projects…” Source: RevenueBase Database · checked Sep 16, 2026
22	Ecoact Part Of Schneider Electric	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	69 contacts →
	Indirect evidence “EcoAct is now SE Advisory Services.” Source: RevenueBase Database · checked Sep 16, 2026
23	Climate Investment CI	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	62 contacts →
	Partial evidence “Climate Investment is a US and UK-based independently managed specialist investor focused on accelerating capital-efficient decarbonization of heavy emitting sectors.” Source: RevenueBase Database · checked Sep 16, 2026
24	CBG Consultants LTD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	61 contacts →
	Partial evidence “As an ambitious building services consultancy, at CBG Consultants we have a strong commitment to excellence.” Source: RevenueBase Database · checked Sep 16, 2026
25	AMBIT	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	58 contacts →
	Indirect evidence “We deliver retrofit and decarbonisation projects across London and the Thames Corridor, with the capability to operate nationally through the support of the Workplace Futures…” Source: RevenueBase Database · checked Sep 16, 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: building decarbonization 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 building decarbonization companies.
Partial evidence: Its own public description names part of building decarbonization companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name building decarbonization 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 330 building decarbonization companies based in London, United Kingdom

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Building decarbonization companies based in London, United Kingdom at a glance

As of Sep 16, 2026

49.8%Verified-email coverage

41.6Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

182

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 330 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 building decarbonization 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 London, United Kingdom whose own description of what they do matches “building decarbonization 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 building decarbonization 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 building decarbonization companies, and records with no verified work email. Companies headquartered outside London 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, 6,823 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 16, 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.

Building decarbonization companies by metro in the United Kingdom

Building decarbonization companies in London330
Building decarbonization companies in Manchester49
Building decarbonization companies in Bristol30
Building decarbonization companies in Birmingham28
Building decarbonization companies in Glasgow27
Building decarbonization companies in Leeds27

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 building decarbonization 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 building decarbonization companies are there based in London, United Kingdom?

RevenueBase identified 330 building decarbonization companies headquartered in London, 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?

Faithful Gould, headquartered in London, tops this list with the largest team on record.

Which city has the most building decarbonization companies?

London leads with 330 headquartered companies, followed by Manchester (49) and Bristol (30).

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 6,823 verified decision-maker contacts tracked across these 330 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 16, 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.