Company lists · Data refreshed September 2026

Top 25 Environmental consultancy firms based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 2, 2026 2,459 companies tracked

RevenueBase identified 2,459 environmental consultancy firms headquartered in the United Kingdom as of September 2026 and tracks 42,788 professional contacts across them, including 20,614 with verified work emails and 4,549 with mobile numbers. London is the largest hub.

This list covers environmental consultancy 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 September 2, 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 Sep 2, 2026 86% judged on-target in blind review

2,459Companies

42,788Contacts tracked

20,614Verified emails

4,549Mobile numbers

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The 25 largest environmental consultancy firms based in the United Kingdom

Ranked by team size

Top 25 of 2,459 environmental consultancy firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 2, 2026. RevenueBase Smart Search rates how each company's information relates to environmental consultancy 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	Exponent	Indirect evidence	London, United Kingdom	1,001-5,000	1,561 contacts →
	Indirect evidence “In an era of accelerating change, Exponent is the only premium engineering and scientific consulting firm with the depth and breadth of expertise to solve our clients’ most…” Source: RevenueBase Database · checked Sep 2, 2026
2	RSK Group	Partial evidence	Bristol, United Kingdom	10001+	1,245 contacts →
	Partial evidence “RSK Group is a global leader in the delivery of environmental and engineering solutions.” Source: RevenueBase Database · checked Sep 2, 2026
3	Hoare LEA	Partial evidence	London, United Kingdom	501-1,000	1,116 contacts →
	Partial evidence “We are an award-winning engineering consultancy with a creative team of engineers, designers, and technical specialists.” Source: RevenueBase Database · checked Sep 2, 2026
4	Pell Frischmann	Strong evidence	London, United Kingdom	501-1,000	687 contacts →
	Strong evidence “Pell Frischmann is a specialist advisory and technical consultancy operating across the built and natural environment, helping to shape a better future for the communities in…” Source: RevenueBase Database · checked Sep 2, 2026
5	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 Sep 2, 2026
6	KBR Granherne	Partial evidence	Leatherhead, United Kingdom	501-1,000	656 contacts →
	Partial evidence “KBR Consulting is one of the world's foremost engineering consultancies specializing in the hydrocarbon and energy industry.” Source: RevenueBase Database · checked Sep 2, 2026
7	Dalcour Maclaren	Partial evidence	Chesterton, United Kingdom	501-1,000	583 contacts →
	Partial evidence “Dalcour Maclaren: delivering land, stakeholder and environmental solutions.” Source: RevenueBase Database · checked Sep 2, 2026
8	Waterman Group	Partial evidence	London, United Kingdom	1,001-5,000	572 contacts →
	Partial evidence “Waterman Group is a multidisciplinary consultancy providing sustainable solutions to meet the planning, engineering design and project delivery needs of the property…” Source: RevenueBase Database · checked Sep 2, 2026
9	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 Sep 2, 2026
10	Fairhurst	Indirect evidence	London, United Kingdom	201-500	446 contacts →
	Indirect evidence “Welcome to Fairhurst: Fairhurst is a Limited Liability Partnership (LLP) of Consulting Engineers practicing in the UK, employing circa 400 staff in 16 principal offices.” Source: RevenueBase Database · checked Sep 2, 2026
11	Fichtner Consulting Engineers LTD	Partial evidence	Glasgow, United Kingdom	51-200	418 contacts →
	Partial evidence “Fichtner is one of the world's leading independent engineering consultancy firms.” Source: RevenueBase Database · checked Sep 2, 2026
12	LUC	Strong evidence	Sheffield, United Kingdom	201-500	379 contacts →
	Strong evidence “LUC is an independent, employee-owned environmental consultancy celebrating its 60th anniversary.” Source: RevenueBase Database · checked Sep 2, 2026
13	Curtins	Indirect evidence	Edinburgh, United Kingdom	201-500	373 contacts →
	Indirect evidence “At Curtins we believe that the true value of our work is defined by the difference for good we make in the lives of real people.” Source: RevenueBase Database · checked Sep 2, 2026
14	Valpak Limited	Partial evidence	Stratford-Upon-Avon, United Kingdom	201-500	364 contacts →
	Partial evidence “Valpak, a Reconomy brand, is an EcoVadis Platinum certified leader in environmental compliance, recycling, and sustainability solutions.” Source: RevenueBase Database · checked Sep 2, 2026
15	Baily Garner	Partial evidence	London, United Kingdom	201-500	265 contacts →
	Partial evidence “Baily Garner is a leading multidisciplinary construction consultancy on a mission to positively impact people's lives.” Source: RevenueBase Database · checked Sep 2, 2026
16	Wardell Armstrong LLP Part Of SLR	Partial evidence	Edinburgh, United Kingdom	501-1,000	253 contacts →
	Partial 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 Sep 2, 2026
17	Roughan & O'donovan	Strong evidence	Otley Leeds, United Kingdom	201-500	221 contacts →
	Strong evidence “Roughan and O’Donovan (ROD) is a leading civil, environmental and structural engineering consultancy.” Source: RevenueBase Database · checked Sep 2, 2026
18	WRC Group	Partial evidence	Swindon, United Kingdom	201-500	220 contacts →
	Partial evidence “Water Research Centre (WRc) is a trusted provider of consultancy, technical services, accreditation schemes, research, innovation and training to customers around the globe.” Source: RevenueBase Database · checked Sep 2, 2026
19	The Erith Group	Partial evidence	London, United Kingdom	501-1,000	215 contacts →
	Partial evidence “Supported by a network of specialist consulting engineers, environmentalists and our own collective experience, our philosophy is simple: to provide a qualitative economic and…” Source: RevenueBase Database · checked Sep 2, 2026
20	Horwath HTL	Indirect evidence	London, United Kingdom	201-500	200 contacts →
	Indirect evidence “Bold steps forward.” Source: RevenueBase Database · checked Sep 2, 2026
21	Frankham Group	Strong evidence	London, United Kingdom	51-200	194 contacts →
	Strong evidence “The Frankham Group provides a full range of consultany services to the built environment, including design, engineering and compliance.” Source: RevenueBase Database · checked Sep 2, 2026
22	RSK Biocensus	Partial evidence	Leeds, United Kingdom	201-500	164 contacts →
	Partial 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 Sep 2, 2026
23	Aqua Consultants	Strong evidence	Birmingham, United Kingdom	51-200	163 contacts →
	Strong evidence “Aqua Consultants provide tailored environmental consultancy to broaden your thinking, lead transformation, and achieve successful outcomes.” Source: RevenueBase Database · checked Sep 2, 2026
24	Lucion	Indirect evidence	Gateshead, United Kingdom	501-1,000	162 contacts →
	Indirect evidence “We're not just service providers; we're your long-term partners in creating a sustainable, compliant, and efficient future for your assets.” Source: RevenueBase Database · checked Sep 2, 2026
25	Arthian LTD	Indirect evidence	Anglesey, United Kingdom	201-500	152 contacts →
	Indirect evidence “Arthian has been established following a merger between Mabbett and IKM Consulting.” Source: RevenueBase Database · checked Sep 2, 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: environmental consultancy 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 environmental consultancy firms.
Partial evidence: Its own public description names part of environmental consultancy firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental consultancy 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 2,459 environmental consultancy firms based in the United Kingdom

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Environmental consultancy firms based in the United Kingdom at a glance

As of Sep 2, 2026

48.2%Verified-email coverage

10.6%Mobile-number coverage

17.4Average contacts per company

1-10Median size (employees)

15.4%Largest-city concentration · London

Sep 2, 2026Page data refreshed

Companies by employee count

1-10

1,652

11-50

562

51-200

144

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 environmental consultancy 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 “environmental consultancy 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 environmental consultancy 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 environmental consultancy 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, 20,614 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 2, 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.

Environmental consultancy 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 environmental consultancy 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 environmental consultancy firms are there based in the United Kingdom?

RevenueBase identified 2,459 environmental consultancy firms 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?

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

Which city has the most environmental consultancy firms?

London leads with 378 headquartered companies, followed by Manchester (54) and Bristol (45).

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 20,614 verified decision-maker contacts tracked across these 2,459 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 2, 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.