Company lists · Data refreshed September 2026

Top 25 Refinery engineering firms based in the United Kingdom

Name: Refinery engineering 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 17, 2026 1,113 companies tracked

RevenueBase identified 1,113 refinery engineering firms headquartered in the United Kingdom as of September 2026 and tracks 60,165 professional contacts across them, including 14,083 with verified work emails. London is the largest hub.

This list covers refinery engineering 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 17, 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 17, 2026 86% judged on-target in blind review

1,113Companies

60,165Contacts tracked

14,083Verified emails

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The 25 largest refinery engineering firms based in the United Kingdom

Ranked by team size

Top 25 of 1,113 refinery engineering firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to refinery engineering 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	WOOD	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	10001+	26,949 contacts →
	Partial evidence “Wood is a global leader in consulting and engineering, delivering critical solutions across energy and materials markets.” Source: RevenueBase Database · checked Sep 17, 2026
2	Penspen	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	1,007 contacts →
	Indirect evidence “Penspen designs, maintains, and optimises energy infrastructure to improve access to secure and sustainable energy for communities worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
3	Pd&ms Group	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	501-1,000	653 contacts →
	Partial evidence “PD & MS Group has full multi-discipline in-house EPCC capability and is recognised as a provider of safe, effective, and cost efficient design and engineering services to onshore…” Source: RevenueBase Database · checked Sep 17, 2026
4	KBR Granherne	Partial evidence	Leatherhead, United KingdomHQ checked Sep 17, 2026	501-1,000	648 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 17, 2026
5	Bgen LTD	Indirect evidence	Warrington, United KingdomHQ checked Sep 17, 2026	1,001-5,000	646 contacts →
	Indirect evidence “We are BGEN.” Source: RevenueBase Database · checked Sep 17, 2026
6	Ineos Grangemouth	Indirect evidence	Grangemouth, United KingdomHQ checked Sep 17, 2026	1,001-5,000	466 contacts →
	Indirect evidence “Located at Grangemouth, some 40km west of Edinburgh, one of INEOS’ largest manufacturing sites directly employs c1500 highly skilled people.” Source: RevenueBase Database · checked Sep 17, 2026
7	Fairhurst	Indirect evidence	Glasgow, United KingdomHQ checked Sep 17, 2026	201-500	437 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 17, 2026
8	MES	Partial evidence	Leatherhead, United KingdomHQ checked Sep 17, 2026	201-500	403 contacts →
	Partial evidence “Monaco Engineering Solutions (MES) is a specialised technical consultancy with a focus in the Oil & Gas, Petrochemical and Refining, Renewable & Clean Energy, Chemical…” Source: RevenueBase Database · checked Sep 17, 2026
9	Trant Engineering LTD	Partial evidence	Southampton, United KingdomHQ checked Sep 17, 2026	501-1,000	376 contacts →
	Partial evidence “Trant Engineering Ltd is one of the leading, privately owned engineering companies in the UK.” Source: RevenueBase Database · checked Sep 17, 2026
10	Claxton Engineering Services	Indirect evidence	Great Yarmouth, United KingdomHQ checked Sep 17, 2026	201-500	279 contacts →
	Indirect evidence “Claxton, an AF Gruppen Company, combines decades of industry experience, proprietary technology, and exceptional service quality to cut through offshore installation and…” Source: RevenueBase Database · checked Sep 17, 2026
11	Ledwood Mechanical Engineering LTD	Partial evidence	Pembrokeshire, United KingdomHQ checked Sep 17, 2026	501-1,000	266 contacts →
	Partial evidence “Ledwood is an independent engineering, fabrication and construction company specialising in the delivery of complex projects across the oil, gas, process and energy industries.” Source: RevenueBase Database · checked Sep 17, 2026
12	The Erith Group	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	217 contacts →
	Indirect 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 17, 2026
13	Actemium UK	Partial evidence	Birmingham, United KingdomHQ checked Sep 17, 2026	501-1,000	190 contacts →
	Partial evidence “At Actemium UK, we are expert electrical, automation and mechanical engineers delivering bespoke engineering solutions across industry, infrastructure and beyond.” Source: RevenueBase Database · checked Sep 17, 2026
14	Wilton Engineering	Partial evidence	Middlesbrough, United KingdomHQ checked Sep 17, 2026	201-500	188 contacts →
	Partial evidence “Wilton Engineering is a multi-disciplined Engineering Services provider based on a 113 acre site by the River Tees in Middlesbrough, North-East England.” Source: RevenueBase Database · checked Sep 17, 2026
15	Blackrow Group	Partial evidence	Grimsby, United KingdomHQ checked Sep 17, 2026	201-500	182 contacts →
	Partial evidence “For over 45 years, Blackrow Engineering has been delivering high-quality engineering, fabrication, and site services to clients across the UK and worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
16	Briggs Of Burton	Indirect evidence	Burton-On-Trent, United KingdomHQ checked Sep 17, 2026	201-500	175 contacts →
	Indirect evidence “Briggs are experienced Process Engineers, operating in the Brewing and Distilling sector since 1732 and responsible for some of the most high profile work of the last decade.” Source: RevenueBase Database · checked Sep 17, 2026
17	Eastgate Engineering	Partial evidence	Thornaby-on-tees, United KingdomHQ checked Sep 17, 2026	201-500	163 contacts →
	Partial evidence “Eastgate Engineering is an Electrical and Instrumentation contractor that delivers complex, high-risk infrastructure projects with cost certainty, without compromising safety or…” Source: RevenueBase Database · checked Sep 17, 2026
18	Z-Tech Control Systems LTD	Indirect evidence	Swavesey, United KingdomHQ checked Sep 17, 2026	201-500	156 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
19	Unitbirwelco	Indirect evidence	Elba Crescent, United KingdomHQ checked Sep 17, 2026	201-500	117 contacts →
	Indirect evidence “As a leading expert in thermal equipment, UnitBirwelco is dedicated to delivering excellence in design, project management, manufacturing, fabrication, construction, and…” Source: RevenueBase Database · checked Sep 17, 2026
20	CTS Offshore & Marine	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	106 contacts →
	Partial evidence “CTS Offshore & Marine Ltd is an independent provider of engineering services tailored for energy and material markets.” Source: RevenueBase Database · checked Sep 17, 2026
21	MII Engineering	Partial evidence	Bedwas, United KingdomHQ checked Sep 17, 2026	201-500	104 contacts →
	Partial evidence “Being a dynamic, customer focused Engineering company enables us to tailor each of our services to particular clients.” Source: RevenueBase Database · checked Sep 17, 2026
22	Petrex Energy Services Limited	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	11-50	99 contacts →
	Partial evidence “Innovative Engineering Excellence for the energy sector through our engineering design & field development divisions.” Source: RevenueBase Database · checked Sep 17, 2026
23	Intelect	Partial evidence	Middlesbrough, United KingdomHQ checked Sep 17, 2026	201-500	92 contacts →
	Partial evidence “At Intelect we have extensive experience providing engineering expertise to process industries involved in food & beverages manufacturing, utilities, heavy industry and renewable…” Source: RevenueBase Database · checked Sep 17, 2026
24	Katoni Engineering	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	90 contacts →
	Partial evidence “Katoni provides consulting, engineering, optimisation and emissions reduction support for the Energy Sector.” Source: RevenueBase Database · checked Sep 17, 2026
25	Barrier Group	Partial evidence	Wallsend, United KingdomHQ checked Sep 17, 2026	201-500	89 contacts →
	Partial evidence “Founded in 1975 in the North East of England, Barrier Group is a multi-disciplined turnkey engineering, design, and build contractor with over 50 years’ experience across…” Source: RevenueBase Database · checked Sep 17, 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: refinery engineering 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 refinery engineering firms.
Partial evidence: Its own public description names part of refinery engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name refinery engineering 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 1,113 refinery engineering firms based in the United Kingdom

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Refinery engineering firms based in the United Kingdom at a glance

As of Sep 17, 2026

23.4%Verified-email coverage

54.1Average contacts per company

1-10Median size (employees)

11.9%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

662

11-50

293

51-200

106

201-500

501-1,000

1,001-5,000

10001+

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 1,113 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 refinery engineering 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 “refinery engineering 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 refinery engineering 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 refinery engineering 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, 14,083 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 17, 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.

Refinery engineering firms by metro

Refinery engineering firms in London132
Refinery engineering firms in Aberdeen67

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 refinery engineering 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 refinery engineering firms are there based in the United Kingdom?

RevenueBase identified 1,113 refinery engineering 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?

WOOD, headquartered in Aberdeen, tops this list with the largest team on record.

Which city has the most refinery engineering firms?

London leads with 132 headquartered companies, followed by Aberdeen (67) and Manchester (22).

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 14,083 verified decision-maker contacts tracked across these 1,113 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 17, 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.