Company lists · Data refreshed September 2026

Top 25 Mep engineering firms based in the United Kingdom

Name: Mep 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 1,362 companies tracked

RevenueBase identified 1,362 mep engineering firms headquartered in the United Kingdom as of September 2026 and tracks 19,311 professional contacts across them, including 8,459 with verified work emails. London is the largest hub.

This list covers mep 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

1,362Companies

19,311Contacts tracked

8,459Verified emails

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The 25 largest mep engineering firms based in the United Kingdom

Ranked by team size

Top 25 of 1,362 mep 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 mep 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	Hoare LEA	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	1,103 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 17, 2026
2	Black & White Engineering	Partial evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 17, 2026	1,001-5,000	888 contacts →
	Partial evidence “Black & White Engineering is a global, award-winning critical buildings and infrastructure engineering consultancy.” Source: RevenueBase Database · checked Sep 17, 2026
3	SES Engineering Services	Partial evidence	York, United KingdomHQ checked Sep 17, 2026	501-1,000	597 contacts →
	Partial evidence “SES Engineering Services boasts a rich 65-year history delivering engineering excellence in the UK.” Source: RevenueBase Database · checked Sep 17, 2026
4	VVB Engineering	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	336 contacts →
	Partial evidence “At VVB, we deliver mechanical, electrical, telecommunication, temporaries and fire engineering expertise and services for large-scale infrastructure projects.” Source: RevenueBase Database · checked Sep 17, 2026
5	JCA Engineering	Partial evidence	Stevenage, United KingdomHQ checked Sep 17, 2026	201-500	237 contacts →
	Partial evidence “JCA is a multi-faceted engineering services and construction business.” Source: RevenueBase Database · checked Sep 17, 2026
6	ESG	Partial evidence	Romford, United KingdomHQ checked Sep 17, 2026	201-500	236 contacts →
	Partial evidence “Essex Services Group (ESG) is a multi-disciplined MEP company founded in 1975, beginning as an electrical services contractor.” Source: RevenueBase Database · checked Sep 17, 2026
7	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
8	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
9	JCK Limited	Indirect evidence	Colnbrook, United KingdomHQ checked Sep 17, 2026	201-500	155 contacts →
	Indirect evidence “Established in 2003, JCK has successfully and consistently been delivering excellent service to clients in our areas of specialism: Mechanical, Electrical & Public Health Building…” Source: RevenueBase Database · checked Sep 17, 2026
10	Harley Haddow	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 17, 2026	51-200	146 contacts →
	Indirect evidence “Harley Haddow are Civil, Structural, Mechanical, Electrical, Building Performance & Sustainability and Geotechnical Consulting Engineers.” Source: RevenueBase Database · checked Sep 17, 2026
11	MCS	Partial evidence	Bristol, United KingdomHQ checked Sep 17, 2026	51-200	138 contacts →
	Partial evidence “MCS Ltd are specialist building services engineers covering all aspects of commercial and industrial building services and infrastructure engineering across varying market sectors.” Source: RevenueBase Database · checked Sep 17, 2026
12	Wintech	Partial evidence	Wolverhampton, United KingdomHQ checked Sep 17, 2026	51-200	127 contacts →
	Partial evidence “Wintech are a building engineering consultancy service with a strong design heritage, working on projects ranging from new build, sustainable developments to complex building…” Source: RevenueBase Database · checked Sep 17, 2026
13	Cilantro Engineering UK Limited	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	123 contacts →
	Partial evidence “Cilantro Engineering is a multi-discipline Building Services Contractor offering a vast range of Mechanical and Electrical Design & Installation services.” Source: RevenueBase Database · checked Sep 17, 2026
14	Wallace Whittle	Strong evidence	Glasgow, United KingdomHQ checked Sep 17, 2026	51-200	121 contacts →
	Strong evidence “WWe are a leading MEP & Sustainability engineering consultancy, committed to driving responsible and sustainable solutions in the built environment.” Source: RevenueBase Database · checked Sep 17, 2026
15	Watkins	Indirect evidence	Ramsgate, United KingdomHQ checked Sep 17, 2026	51-200	118 contacts →
	Indirect evidence “For over 60 years, Watkins has been a leading provider of Mechanical, Electrical and Plumbing services in London and SE England.” Source: RevenueBase Database · checked Sep 17, 2026
16	LJJ LTD	Indirect evidence	Stockton On Tees, United KingdomHQ checked Sep 17, 2026	201-500	114 contacts →
	Indirect evidence “LJJ formed in 2001 as a private limited company and is a multi-disciplined organisation capable of completing major mechanical, electrical and public health service contracts in a…” Source: RevenueBase Database · checked Sep 17, 2026
17	Brookbanks	Partial evidence	United KingdomHQ checked Sep 17, 2026	51-200	113 contacts →
	Partial evidence “Project Consultant & Development Partner: Civil, Structural, Mechanical & Electrical Engineering Designs; Highways, Transportation & Environmental; Cost & Commercial & Development…” Source: RevenueBase Database · checked Sep 17, 2026
18	East West Connect LTD	Indirect evidence	Perivale, United KingdomHQ checked Sep 17, 2026	201-500	111 contacts →
	Indirect evidence “Founded in 1988, we are a family-owned business of passionate engineers who specialise in building services-driven construction projects, undertaking all major works in-house.” Source: RevenueBase Database · checked Sep 17, 2026
19	Stothers M&e LTD	Indirect evidence	Belfast, United KingdomHQ checked Sep 17, 2026	51-200	109 contacts →
	Indirect evidence “Founded in 1957, Stothers (M&E) Ltd is a national market leader in the provision of Mechanical and Electrical Building Services and Contract Maintenance.” Source: RevenueBase Database · checked Sep 17, 2026
20	Alan Wood & Partners	Indirect evidence	Hull, United KingdomHQ checked Sep 17, 2026	51-200	106 contacts →
	Indirect evidence “Established in 1968 as a firm of Consulting Civil & Structural Engineers Alan Wood & Partners now have 7 offices in the UK.” Source: RevenueBase Database · checked Sep 17, 2026
21	JCW Energy Services LTD	Partial evidence	Melbourn, United KingdomHQ checked Sep 17, 2026	201-500	103 contacts →
	Partial evidence “JCW Energy Services is a privately held SME business operating in the building services engineering sector throughout the UK.” Source: RevenueBase Database · checked Sep 17, 2026
22	Woodford	Indirect evidence	Loughton, United KingdomHQ checked Sep 17, 2026	51-200	99 contacts →
	Indirect evidence “Woodford specialise in mechanical and electrical building services for the construction market.” Source: RevenueBase Database · checked Sep 17, 2026
23	Hulley And Kirkwood	Indirect evidence	Glasgow, United KingdomHQ checked Sep 17, 2026	51-200	98 contacts →
	Indirect evidence “We are an independent Building Services Consultancy providing national coverage.” Source: RevenueBase Database · checked Sep 17, 2026
24	Castle	Partial evidence	Hebburn, United KingdomHQ checked Sep 17, 2026	201-500	97 contacts →
	Partial evidence “Castle offer design services, Principal Contracting, MEP Subcontracting, new builds, fit-outs and refurbs.” Source: RevenueBase Database · checked Sep 17, 2026
25	SOWGA	Partial evidence	Pulborough, United KingdomHQ checked Sep 17, 2026	51-200	95 contacts →
	Partial evidence “With over 40 years of experience in building services engineering, Sowga, a Pareto company, is a trusted provider of mechanical and electrical engineering, maintenance, and…” 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: mep 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 mep engineering firms.
Partial evidence: Its own public description names part of mep engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name mep 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 1,362 mep engineering firms based in the United Kingdom

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Mep engineering firms based in the United Kingdom at a glance

As of Sep 17, 2026

43.8%Verified-email coverage

14.2Average contacts per company

11-50Median size (employees)

14.8%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

622

11-50

527

51-200

162

201-500

501-1,000

1,001-5,000

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 1,362 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 mep 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 “mep 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 mep 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 mep 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, 8,459 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.

Mep engineering 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 mep 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 mep engineering firms are there based in the United Kingdom?

RevenueBase identified 1,362 mep 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?

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

Which city has the most mep engineering firms?

London leads with 201 headquartered companies, followed by Manchester (32) and Bristol (28).

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 8,459 verified decision-maker contacts tracked across these 1,362 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.