Company lists · Data refreshed September 2026

Top 25 Ecological assessment firms based in the United Kingdom

Name: Ecological assessment 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 19, 2026 503 companies tracked

RevenueBase identified 503 ecological assessment firms headquartered in the United Kingdom as of September 2026 and tracks 5,707 professional contacts across them, including 2,761 with verified work emails. London is the largest hub.

This list covers ecological assessment 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 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

503Companies

5,707Contacts tracked

2,761Verified emails

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The 25 largest ecological assessment firms based in the United Kingdom

Ranked by team size

Top 25 of 503 ecological assessment firms 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 ecological assessment 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	Arbtech	Partial evidence	Chester, United KingdomHQ checked Sep 19, 2026	51-200	218 contacts →
	Partial evidence “Founded in 2005, Arbtech has grown into the UK's leading arboricultural and ecological consultancy.” Source: RevenueBase Database · checked Sep 19, 2026
2	RSK Biocensus	Partial evidence	Helsby, United KingdomHQ checked Sep 19, 2026	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 19, 2026
3	Thomson Environmental Consultants	Indirect evidence	Guildford, United KingdomHQ checked Sep 19, 2026	51-200	133 contacts →
	Indirect evidence “Thomson Environmental Consultants are experts in environmental compliance with offices in Guildford, Leeds, Cardiff, Birmingham and Manchester.” Source: RevenueBase Database · checked Sep 19, 2026
4	Middlemarch	Indirect evidence	Coventry, United KingdomHQ checked Sep 19, 2026	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 Sep 19, 2026
5	Yordas Group	Indirect evidence	Lancaster, United KingdomHQ checked Sep 19, 2026	51-200	112 contacts →
	Indirect evidence “In 2026, Yordas Group was acquired by 3E, the leading global provider of expert-led AI compliance solutions for chemical and workplace safety, product stewardship, and sustainable…” Source: RevenueBase Database · checked Sep 19, 2026
6	AES Sustainability Consultants	Indirect evidence	Tiverton, United KingdomHQ checked Sep 19, 2026	51-200	92 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 Sep 19, 2026
7	Cura Terrae Land & Nature	Partial evidence	Sheffield, United KingdomHQ checked Sep 19, 2026	51-200	92 contacts →
	Partial evidence “Our multidisciplinary teams work together to combine their expertise in ecology, the historic environment, environmental impact assessment, landscape architecture, habitat…” Source: RevenueBase Database · checked Sep 19, 2026
8	Lanpro	Indirect evidence	Norwich, United KingdomHQ checked Sep 19, 2026	51-200	87 contacts →
	Indirect evidence “We are planning-led multi-disciplinary environmental consultants.” Source: RevenueBase Database · checked Sep 19, 2026
9	Ecology Solutions	Indirect evidence	Broadway, United KingdomHQ checked Sep 19, 2026	11-50	85 contacts →
	Indirect evidence “Ecology Solutions is a leading multidisciplinary environmental consultancy, specialising in ecology, archaeology and heritage, landscape design, mitigation and biodiversity.” Source: RevenueBase Database · checked Sep 19, 2026
10	CSA Environmental	Indirect evidence	Ashwell, United KingdomHQ checked Sep 19, 2026	51-200	76 contacts →
	Indirect evidence “CSA Environmental is a multidisciplinary environmental consultancy practice providing specialist advice covering Ecology, Heritage, Landscape, and Masterplanning and Urban Design.” Source: RevenueBase Database · checked Sep 19, 2026
11	Ocean Ecology LTD	Indirect evidence	Gloucester, United KingdomHQ checked Sep 19, 2026	51-200	76 contacts →
	Indirect evidence “Ocean Ecology Limited is a leading marine environmental consultancy specialising in providing survey, technical, data and advisory services to organisations delivering and…” Source: RevenueBase Database · checked Sep 19, 2026
12	Atmos Consulting LTD	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 19, 2026	51-200	75 contacts →
	Indirect evidence “Atmos Consulting is a modern and dynamic environmental and planning consultancy uniquely structured to offer superior service to its clients by providing cost-effective, robust…” Source: RevenueBase Database · checked Sep 19, 2026
13	Rammsanderson Ecology LTD	Partial evidence	Beeston, United KingdomHQ checked Sep 19, 2026	51-200	74 contacts →
	Partial evidence “RammSanderson Ecology Ltd is a specialist ecological consultancy based at offices in the East Midlands, West Midlands, Yorkshire, North West, South West and South East, offering…” Source: RevenueBase Database · checked Sep 19, 2026
14	BSG Ecology	Partial evidence	Abingdon, United KingdomHQ checked Sep 19, 2026	51-200	73 contacts →
	Partial evidence “BSG Ecology is an award-winning independent ecological consultancy.” Source: RevenueBase Database · checked Sep 19, 2026
15	Envirocentre	Indirect evidence	Glasgow, United KingdomHQ checked Sep 19, 2026	51-200	71 contacts →
	Indirect evidence “EnviroCentre is a solutions orientated consultancy that has a proven track record in providing innovative, effective and valuable advice.” Source: RevenueBase Database · checked Sep 19, 2026
16	Brindle & Green Environmental Consultants	Indirect evidence	Radbourne, United KingdomHQ checked Sep 19, 2026	51-200	64 contacts →
	Indirect evidence “Over the last decade, Brindle & Green has worked tirelessly to create a business that strives for technical excellence alongside being recognised for creating a culture for our…” Source: RevenueBase Database · checked Sep 19, 2026
17	Lucion Delta-Simons LTD	Indirect evidence	Nettleham, United KingdomHQ checked Sep 19, 2026	201-500	64 contacts →
	Indirect evidence “Now part of Lucion, Delta-Simons was established to facilitate sustainable development through multi-disciplinary environmental and health and safety consultancy advice.” Source: RevenueBase Database · checked Sep 19, 2026
18	Aspect Ecology LTD	Partial evidence	Banbury, United KingdomHQ checked Sep 19, 2026	11-50	61 contacts →
	Partial evidence “Aspect Ecology's established team is highly qualified in all areas of ecological planning and biodiversity net gain (BNG).” Source: RevenueBase Database · checked Sep 19, 2026
19	Southern Ecological Solutions SES	Partial evidence	Downham, United KingdomHQ checked Sep 19, 2026	11-50	56 contacts →
	Partial evidence “Southern Ecological Solutions (SES) is a multidisciplinary independent business that provides ecological and arboricultural consulting services throughout the UK.” Source: RevenueBase Database · checked Sep 19, 2026
20	GE Consulting	Partial evidence	Christow, United KingdomHQ checked Sep 19, 2026	11-50	53 contacts →
	Partial evidence “Environmental Consultancy with offices in Exeter and Bristol providing a wide range of ecological, arboricultural and land management services throughout the south of England and…” Source: RevenueBase Database · checked Sep 19, 2026
21	Fiverivers	Partial evidence	Codford, United KingdomHQ checked Sep 19, 2026	51-200	49 contacts →
	Partial evidence “FiveRivers is a leading industry specialist in the consultation, design and delivery of ecological and environmental solutions.” Source: RevenueBase Database · checked Sep 19, 2026
22	Hidef Aerial Surveying Limited	Indirect evidence	Workington, United KingdomHQ checked Sep 19, 2026	51-200	48 contacts →
	Indirect evidence “HiDef & BioConsult SH are innovative, solutions-driven, survey and consultancy providers, with HiDef being the UK’s market leader in high-resolution digital aerial offshore…” Source: RevenueBase Database · checked Sep 19, 2026
23	NEO Environmental LTD	Indirect evidence	Glasgow, United KingdomHQ checked Sep 19, 2026	11-50	45 contacts →
	Indirect evidence “Neo Environmental Ltd is a multidisciplinary consultancy that provide cost effective environmental and technical services to the commercial energy, property, aggregates and…” Source: RevenueBase Database · checked Sep 19, 2026
24	Bowland Ecology LTD	Partial evidence	New, United KingdomHQ checked Sep 19, 2026	11-50	43 contacts →
	Partial evidence “Bowland Ecology is an independent practice specialising in ecological consultancy.” Source: RevenueBase Database · checked Sep 19, 2026
25	Keystone Environmental LTD	Partial evidence	Tetbury, United KingdomHQ checked Sep 19, 2026	11-50	43 contacts →
	Partial evidence “Keystone Environmental is an ecological consultancy with a practical, intelligent and pioneering approach to advising its clients.” 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: ecological assessment 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 ecological assessment firms.
Partial evidence: Its own public description names part of ecological assessment firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name ecological assessment 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 503 ecological assessment firms based in the United Kingdom

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Ecological assessment firms based in the United Kingdom at a glance

As of Sep 19, 2026

48.4%Verified-email coverage

11.3Average contacts per company

1-10Median size (employees)

4.8%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

344

11-50

122

51-200

201-500

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 503 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 ecological assessment 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 “ecological assessment 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 ecological assessment 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 ecological assessment 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, 2,761 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.

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 ecological assessment 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 ecological assessment firms are there based in the United Kingdom?

RevenueBase identified 503 ecological assessment 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?

Arbtech, headquartered in Chester, tops this list with the largest team on record.

Which city has the most ecological assessment firms?

London leads with 24 headquartered companies, followed by Bristol (8) and Exeter (7).

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 2,761 verified decision-maker contacts tracked across these 503 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.