Company lists · Data refreshed October 2026

Top 25 Geothermal engineering firms based in the United Kingdom

RevenueBase identified 270 company matches for geothermal engineering firms associated with the United Kingdom as of October 2026 and tracks 2,136 professional contacts across them, including 814 with verified work emails. London is the largest hub.

This list covers company matches for geothermal engineering firms associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 13, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 SmartSearch · Exact Recorded Oct 13, 2026 How this list was built
270Companies
2,136Contacts tracked
814Verified emails
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The 25 largest geothermal engineering firms based in the United Kingdom

Ranked by team size
Top 25 of 270 company matches for geothermal engineering firms based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 13, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchSudbrooke, United KingdomHQ recorded Oct 13, 202651-20080 contacts →

Exact match

“Star Energy Group plc is a British energy business.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
2Exact matchEynsham, United KingdomHQ recorded Oct 13, 202651-20076 contacts →

Exact match

“Zetica is the UK’s leader in engineering and environmental geophysics, with an enviable reputation for objective advice, novel problem solving, consistently high-quality surveys…”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
3Exact matchBallymoney, United KingdomHQ recorded Oct 13, 202651-20068 contacts →

Exact match

“Causeway Geotech Ltd bring together a team of Chartered Geotechnical Engineers with over 100 years of experience in total of offshore and onshore geotechnical ground investigation.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
4Exact matchLondon, United KingdomHQ recorded Oct 13, 202651-20067 contacts →

Exact match

“Dr.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
5Exact matchEdinburgh, United KingdomHQ recorded Oct 13, 202651-20059 contacts →

Exact match

“RSP Consulting Engineers LLP are leaders in sustainable and low energy building services design.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
6Exact matchHull, United KingdomHQ recorded Oct 13, 202651-20042 contacts →

Exact match

“OSL is a multi-disciplined team of creative, forward thinking technical specialists, working collaboratively with the energy and related sectors to provide quality implemented…”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
7Exact matchLondon, United KingdomHQ recorded Oct 13, 202611-5038 contacts →

Exact match

“Skelly & Couch is a leading environmental engineering practice with offices in London, Bristol, and Newcastle.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
8Exact matchLondon, United KingdomHQ recorded Oct 13, 202611-5033 contacts →

Exact match

“We’re helping to create a world where every building is truly zero carbon.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
9Exact matchNorwich, United KingdomHQ recorded Oct 13, 202611-5032 contacts →

Exact match

“Harrison Group Environmental is one of the UK’s leading geotechnical and geoenvironmental engineering firms.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
10Exact matchBristol, United KingdomHQ recorded Oct 13, 202611-5031 contacts →

Exact match

“Our Footprints combines a small and dedicated group of highly experienced and qualified Engineers/ Project Managers.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
11Exact matchCaterham, United KingdomHQ recorded Oct 13, 202651-20030 contacts →

Exact match

“Our founder, Simon Flatt, started the practice in 2003 to provide sustainable engineering solutions of the highest quality and standard.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
12Exact matchLondon, United KingdomHQ recorded Oct 13, 202651-20030 contacts →

Exact match

“GEO is a global company whose mission is to improve the efficiency of the drilling and excavation processes in the foundation industry, through the application of unique products…”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
13Exact matchGreat Yarmouth, United KingdomHQ recorded Oct 13, 202611-5029 contacts →

Exact match

“CeraPhi Energy is a leading project development company delivering global geothermal energy solutions at scale.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
14Exact matchLondon, United KingdomHQ recorded Oct 13, 202611-5028 contacts →

Exact match

“Geotechnical Consulting Group (GCG) is one of the world’s leading independent geotechnical engineering consultancies, recognised for delivering innovative, research driven…”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
15Exact matchNorwich, United KingdomHQ recorded Oct 13, 202611-5026 contacts →

Exact match

“A F Howland Associates was formed in 1981 to provide an independent practice offering a specialist service in geotechnical engineering and related disciplines.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
16Exact matchWarrington, United KingdomHQ recorded Oct 13, 202611-5024 contacts →

Exact match

“Founded in 1998, EPG has developed into a thriving and dynamic Geo Environmental Engineering Design Consultancy.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
17Exact matchKeele, United KingdomHQ recorded Oct 13, 202611-5023 contacts →

Exact match

“CQA International Ltd (CQA) is an environmental engineering consultancy that specialises in geotechnical and mining engineering, containment systems, waste management and…”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
18Exact matchCounty Durham, United KingdomHQ recorded Oct 13, 202611-5023 contacts →

Exact match

“M5tec Limited are a leading provider of engineering technical services to high assurance industries worldwide such as Marine Mining, Subsea & Offshore, Nuclear and Oil & Gas.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
19Exact matchThe Pensnett Estate, United KingdomHQ recorded Oct 13, 202611-5022 contacts →

Exact match

“Established in the heart of the Black Country in 1982, GIP is now one of the largest geo-environmental and geotechnical engineering companies of its kind in the Midlands…”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
20Exact matchWhaley Bridge, United KingdomHQ recorded Oct 13, 202611-5022 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
21Exact matchKirdford, United KingdomHQ recorded Oct 13, 202651-20021 contacts →

Exact match

“Nicholls Boreholes & Ground Source is an established, industry leading, family-run, specialist drilling company.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
22Exact matchSeaham, United KingdomHQ recorded Oct 13, 202611-5021 contacts →

Exact match

“Drilcorp was established in 1992 and since then has developed into one of the UK’s top drilling companies.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
23Exact matchFlax Bourton, United KingdomHQ recorded Oct 13, 202611-5021 contacts →

Exact match

“Taranis engineering was formed in October 2013 by the former director shareholders of JCW air-conditioning together with Jon Salter, John Lawrence and Alex Bond.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
24Exact matchCardiff, United KingdomHQ recorded Oct 13, 202611-5020 contacts →

Exact match

“At Nuvolt we advise, design, construct, maintain and optimise low carbon technology solutions.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
25Exact matchStourbridge, United KingdomHQ recorded Oct 13, 202611-5018 contacts →

Exact match

“SwitchOn Power is a specialized engineering company, focusing on renewable energy generation projects.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase

Showing 25 of 270 geothermal engineering firms based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 814 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Geothermal engineering firms based in the United Kingdom at a glance

As of Oct 13, 2026
38.1%Verified-email coverage
7.9Average contacts per company
1-10Median size (employees)
17.0%Largest-city concentration · London
Oct 13, 2026Page data refreshed

Companies by employee count

1-10
159
11-50
92
51-200
14
201-500
1
1,001-5,000
2

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 270 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Company records associated with the United Kingdom whose business descriptions match “geothermal engineering firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 814 professional contacts with verified work emails across the full matched dataset. 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 October 13, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Geothermal engineering firms by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “geothermal engineering firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many geothermal engineering firms are there based in the United Kingdom?

RevenueBase identified 270 company matches for geothermal engineering firms associated with the United Kingdom as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Star Energy Group PLC tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most geothermal engineering firms?

London leads with 46 company records, followed by Aberdeen (10) and Edinburgh (8).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 814 professional contacts with verified work emails tracked across these 270 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 13, 2026.

Ready to reach these companies? Verified emails and direct dials for all 270 geothermal engineering firms based in the United Kingdom. Start with a free account, no credit card.

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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 SmartSearch, 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.