Company lists · Data verified August 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 Verified Aug 28, 2026 2,459 companies tracked

There are 2,459 environmental consultancy firms headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase 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. Data current as of August 28, 2026.

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 verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Exponent	London	1,001-5,000	1,561	980
2	RSK Group	Bristol	10001+	1,245	29
3	Hoare LEA	London	501-1,000	1,116	641
4	Pell Frischmann	London	501-1,000	687	349
5	Ricardo PLC	London	1,001-5,000	680	290
6	KBR Granherne	Leatherhead	501-1,000	656	101
7	Dalcour Maclaren	Chesterton	501-1,000	583	405
8	Waterman Group	London	1,001-5,000	572	322
9	ADP Consulting	London	201-500	463	270
10	Fairhurst	London	201-500	446	261
11	Fichtner Consulting Engineers LTD	Glasgow	51-200	418	112
12	LUC	Sheffield	201-500	379	247
13	Curtins	Edinburgh	201-500	373	268
14	Valpak Limited	Stratford-Upon-Avon	201-500	364	264
15	Baily Garner	London	201-500	265	170
16	Wardell Armstrong LLP Part Of SLR	Edinburgh	501-1,000	253	131
17	Roughan & O'donovan	Otley Leeds	201-500	221	173
18	WRC Group	Swindon	201-500	220	137
19	The Erith Group	London	501-1,000	215	127
20	Horwath HTL	London	201-500	200	78
21	Frankham Group	London	51-200	194	104
22	RSK Biocensus	Leeds	201-500	164	119
23	Aqua Consultants	Birmingham	51-200	163	99
24	Lucion	Gateshead	501-1,000	162	97
25	Arthian LTD	Anglesey	201-500	152	105

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 Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 378 HQs

4,549Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

1,652

11-50

562

51-200

144

201-500

501-1,000

1,001-5,000

10001+

Environmental consultancy firms by metro

Metro	Companies
Environmental consultancy firms in London	378
Environmental consultancy firms in Manchester	54
Environmental consultancy firms in Bristol	45
Environmental consultancy firms in Edinburgh	32
Environmental consultancy firms in Glasgow	30
Environmental consultancy firms in Leeds	29
Environmental consultancy firms in Cardiff	26

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “environmental consultancy firms”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many environmental consultancy firms are there based in the United Kingdom?

There are 2,459 environmental consultancy firms headquartered in the United Kingdom as of August 2026 (RevenueBase).

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 is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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Environmental consultancy firms by geography

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.