Company lists · Data refreshed August 2026

Top 25 Climate consulting firms based in the United Kingdom

Name: Climate consulting firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Aug 31, 2026 1,364 companies tracked

RevenueBase identified 1,364 climate consulting firms headquartered in the United Kingdom as of August 2026 and tracks 58,721 professional contacts across them, including 27,876 with verified work emails and 7,928 with mobile numbers. London is the largest hub.

This list covers climate consulting firms 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 August 31, 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 RevenueBase Smart Search rating on every row Refreshed Aug 31, 2026 86% judged on-target in blind review

1,364Companies

58,721Contacts tracked

27,876Verified emails

7,928Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest climate consulting firms based in the United Kingdom

Ranked by team size

Top 25 of 1,364 climate consulting firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Aug 31, 2026. RevenueBase Smart Search rates how each company's information relates to climate consulting firms: 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	Arcadis	Indirect evidence	Croydon, United Kingdom	10001+	33,933 contacts →
	Indirect evidence “Arcadis is a leading global partner, delivering transformative projects with businesses, cities and industries.” Source: RevenueBase Database · checked Aug 31, 2026
2	JBA Consulting	Partial evidence	Skipton, United Kingdom	501-1,000	717 contacts →
	Partial evidence “Leading in society's pursuit for resilience to climate change.” Source: RevenueBase Database · checked Aug 31, 2026
3	Ricardo PLC	Indirect evidence	London, United Kingdom	1,001-5,000	680 contacts →
	Indirect evidence “Click the 'Follow' button and explore careers at Ricardo on our 'Jobs' and 'Life' tabs and at careers.ricardo.com.” Source: RevenueBase Database · checked Aug 31, 2026
4	E CO	Partial evidence	London, United Kingdom	n/a	623 contacts →
	Partial evidence “For over 26 years, our consultants have been supporting and guiding our clients to achieve low-carbon climate-resilient development.” Source: RevenueBase Database · checked Aug 31, 2026
5	ADP Consulting	Partial evidence	London, United Kingdom	201-500	463 contacts →
	Partial evidence “ADP Consulting, an Ayesa company, is a sustainability-led engineering consultancy on a quest to inspire a better world through influence and design.” Source: RevenueBase Database · checked Aug 31, 2026
6	Fichtner Consulting Engineers LTD	Indirect evidence	Glasgow, United Kingdom	51-200	418 contacts →
	Indirect evidence “Fichtner is one of the world's leading independent engineering consultancy firms.” Source: RevenueBase Database · checked Aug 31, 2026
7	Inspired PLC	Indirect evidence	Kirkham, United Kingdom	501-1,000	374 contacts →
	Indirect evidence “Inspired PLC is a leading technology-enabled provider of energy and sustainability solutions that allow UK and Irish businesses to transition to net-zero carbon and manage their…” Source: RevenueBase Database · checked Aug 31, 2026
8	Hydrock, NOW Stantec	Indirect evidence	Hale, United Kingdom	501-1,000	357 contacts →
	Indirect evidence “Hydrock now Stantec is an integrated engineering design, energy and sustainability consultancy.” Source: RevenueBase Database · checked Aug 31, 2026
9	EIC Partnership	Indirect evidence	Redditch, United Kingdom	51-200	315 contacts →
	Indirect evidence “EIC Partnership: A Legacy of Expertise, A Commitment to Sustainability With origins dating back to 1975, EIC has cultivated nearly 50 years of distinguished service in energy and…” Source: RevenueBase Database · checked Aug 31, 2026
10	H&z Management Consulting	Indirect evidence	London, United Kingdom	501-1,000	287 contacts →
	Indirect evidence “Welcome to H&Z We offer more than successful strategy development.” Source: RevenueBase Database · checked Aug 31, 2026
11	Wardell Armstrong LLP Part Of SLR	Indirect evidence	Edinburgh, United Kingdom	501-1,000	253 contacts →
	Indirect evidence “Wardell Armstrong is now part of SLR which is a leading global consultancy, accelerating our ability to deliver the net zero transition and helping our clients address critical…” Source: RevenueBase Database · checked Aug 31, 2026
12	Avantis	Indirect evidence	London, United Kingdom	501-1,000	206 contacts →
	Indirect evidence “Avantis Group, based in the UK, is a global leader in energy and transportation.” Source: RevenueBase Database · checked Aug 31, 2026
13	Landell Mills	Indirect evidence	Trowbridge, United Kingdom	51-200	196 contacts →
	Indirect evidence “Leading international development consultancy Providing communities, economies and environments with the means and opportunities to grow Founded in 1975, Landell Mills is a…” Source: RevenueBase Database · checked Aug 31, 2026
14	CFP Energy	Indirect evidence	London, United Kingdom	201-500	177 contacts →
	Indirect evidence “CFP Energy is a leading provider of energy and environmental solutions for industrial and commercial clients.” Source: RevenueBase Database · checked Aug 31, 2026
15	Pegasys Consulting	Strong evidence	London, United Kingdom	51-200	170 contacts →
	Strong evidence “Pegasys is a multidisciplinary strategic management consulting group with expertise in the development and management of climate change, cities, energy, resilience, transport…” Source: RevenueBase Database · checked Aug 31, 2026
16	RSK Biocensus	Indirect evidence	Leeds, United Kingdom	201-500	164 contacts →
	Indirect evidence “RSK Biocensus is an ecological consultancy with a presence across the country and an extensive network of ecologists throughout the UK.” Source: RevenueBase Database · checked Aug 31, 2026
17	Aqua Consultants	Indirect evidence	Birmingham, United Kingdom	51-200	163 contacts →
	Indirect evidence “Aqua Consultants provide tailored environmental consultancy to broaden your thinking, lead transformation, and achieve successful outcomes.” Source: RevenueBase Database · checked Aug 31, 2026
18	Arthian LTD	Partial evidence	Anglesey, United Kingdom	201-500	152 contacts →
	Partial evidence “Arthian has been established following a merger between Mabbett and IKM Consulting.” Source: RevenueBase Database · checked Aug 31, 2026
19	Evora Global	Indirect evidence	London, United Kingdom	51-200	149 contacts →
	Indirect evidence “EVORA is an award-winning global sustainability consultancy and software provider supporting real asset investors, owners, and operators.” Source: RevenueBase Database · checked Aug 31, 2026
20	Consultus	Partial evidence	Rochford, United Kingdom	51-200	127 contacts →
	Partial evidence “Recognised as the Consultancy of the Year in 2021 by Energy Live News, Consultus delivers world-class consulting, buying and management services for Business Energy and Business…” Source: RevenueBase Database · checked Aug 31, 2026
21	AMBER	Indirect evidence	Cardiff, United Kingdom	51-200	123 contacts →
	Indirect evidence “We are an award-winning energy consultancy and certified B Corp™.” Source: RevenueBase Database · checked Aug 31, 2026
22	Middlemarch	Indirect evidence	Southampton, United Kingdom	51-200	118 contacts →
	Indirect evidence “With a legacy of over 30 years, we are a UK leading independent consultancy specialising in the preservation of the natural environment.” Source: RevenueBase Database · checked Aug 31, 2026
23	ARUP	Indirect evidence	Solihull, United Kingdom	501-1,000	96 contacts →
	Indirect evidence Source: RevenueBase Database · checked Aug 31, 2026
24	3keel	Indirect evidence	Oxford, United Kingdom	51-200	93 contacts →
	Indirect evidence “3Keel is an award-winning B-Corp sustainability consultancy committed to making systems, supply chains and landscapes fit for the future.” Source: RevenueBase Database · checked Aug 31, 2026
25	AES Sustainability Consultants	Indirect evidence	Tiverton, United Kingdom	51-200	91 contacts →
	Indirect evidence “AES Sustainability Consultants is a leading technical consultancy that delivers value engineered solutions across the homebuilding and construction industries.” Source: RevenueBase Database · checked Aug 31, 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: climate consulting firms. 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 climate consulting firms.
Partial evidence: Its own public description names part of climate consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name climate consulting firms. 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 1,364 climate consulting firms based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 27,876 reachable decision-makers.

Free signup · no credit card

View the full list →

Climate consulting firms based in the United Kingdom at a glance

As of Aug 31, 2026

47.5%Verified-email coverage

13.5%Mobile-number coverage

43.1Average contacts per company

1-10Median size (employees)

33.9%Largest-city concentration · London

Aug 31, 2026Page data refreshed

Companies by employee count

1-10

967

11-50

281

51-200

201-500

501-1,000

1,001-5,000

10001+

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 climate consulting firms, 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 “climate consulting firms”. 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 climate consulting firms), 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 climate consulting firms, 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, 27,876 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 August 31, 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.

Climate consulting firms by metro

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 climate consulting firms, 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 climate consulting firms are there based in the United Kingdom?

RevenueBase identified 1,364 climate consulting firms headquartered in the United Kingdom as of August 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?

Arcadis, headquartered in Croydon, tops this list with the largest team on record.

Which city has the most climate consulting firms?

London leads with 463 headquartered companies, followed by Edinburgh (34) and Bristol (33).

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 27,876 verified decision-maker contacts tracked across these 1,364 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 31, 2026.

Ready to reach these companies? Verified emails and direct dials for all 1,364 climate consulting firms based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Climate consulting firms by geography

Browse the directory

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.