Company lists · Data refreshed September 2026

Top 25 Mechanical contractors for energy based in the United Kingdom

Name: Mechanical contractors for energy 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 1,418 companies tracked

RevenueBase identified 1,418 mechanical contractors for energy headquartered in the United Kingdom as of September 2026 and tracks 13,780 professional contacts across them, including 4,819 with verified work emails. London is the largest hub.

This list covers mechanical contractors for energy 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

1,418Companies

13,780Contacts tracked

4,819Verified emails

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The 25 largest mechanical contractors for energy based in the United Kingdom

Ranked by team size

Top 25 of 1,418 mechanical contractors for energy 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 mechanical contractors for energy: 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	Space Engineering Services LTD	Indirect evidence	Bristol, United KingdomHQ checked Sep 17, 2026	201-500	312 contacts →
	Indirect evidence “Space Engineering Services is the UK’s leading provider of refrigeration, heating, ventilation and air conditioning services.” Source: RevenueBase Database · checked Sep 17, 2026
2	Rainham Industrial Services LTD	Indirect evidence	Essex, United KingdomHQ checked Sep 17, 2026	501-1,000	264 contacts →
	Indirect evidence “Rainham provides specialist industrial services that support the installation, maintenance, refurbishment, decommissioning and replacement of large industrial plants and building…” Source: RevenueBase Database · checked Sep 17, 2026
3	Laker Vent Engineering Limited	Strong evidence	Ellesmere Port, United KingdomHQ checked Sep 17, 2026	201-500	175 contacts →
	Strong evidence “Piping and Mechanical contractors for the, Nuclear, Power, Energy from Waste, Pharmaceutical, Food, Brewing, Chemical, Agrochemical, Oil & Gas, Healthcare & Aerospace process…” Source: RevenueBase Database · checked Sep 17, 2026
4	Swegon Uk&i	Partial evidence	Ashby-de-la-zouch, United KingdomHQ checked Sep 17, 2026	501-1,000	156 contacts →
	Partial evidence “Swegon is a market leading supplier of energy efficient indoor climate, cooling and life safety systems.” Source: RevenueBase Database · checked Sep 17, 2026
5	MCS	Indirect evidence	Bristol, United KingdomHQ checked Sep 17, 2026	51-200	138 contacts →
	Indirect 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
6	Geoffrey Robinson Limited	Strong evidence	Billingham, United KingdomHQ checked Sep 17, 2026	201-500	136 contacts →
	Strong evidence “Geoffrey Robinson are an award-winning mechanical, electrical and construction contractor, one of the largest in the North East.” Source: RevenueBase Database · checked Sep 17, 2026
7	Irwin M&e	Strong evidence	Portadown, United KingdomHQ checked Sep 17, 2026	201-500	134 contacts →
	Strong evidence “We provide a full range of Mechanical, Electrical, Energy and Renewables installation and maintenance services to clients, across both public and private sectors throughout the UK…” Source: RevenueBase Database · checked Sep 17, 2026
8	Cilantro Engineering UK Limited	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	123 contacts →
	Strong 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
9	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
10	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
11	Cavendish Northern Limited	Partial evidence	Billingham, United KingdomHQ checked Sep 17, 2026	51-200	111 contacts →
	Partial evidence “CAVENDISH NORTHERN LTD (CNL) ARE A PIPEWORK AND MECHANICAL INSTALLATION CONTRACTING COMPANY.” Source: RevenueBase Database · checked Sep 17, 2026
12	Stothers M&e LTD	Partial evidence	Belfast, United KingdomHQ checked Sep 17, 2026	51-200	109 contacts →
	Partial 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
13	Correct Contract Services CCS	Strong evidence	Andover, United KingdomHQ checked Sep 17, 2026	201-500	108 contacts →
	Strong evidence “Correct Contract Services (CCS) is a trusted main contractor for compliance and energy services, expertly serving social housing landlords across the UK.” Source: RevenueBase Database · checked Sep 17, 2026
14	Hotchkiss LTD	Partial evidence	Eastbourne, United KingdomHQ checked Sep 17, 2026	201-500	107 contacts →
	Partial evidence “Hotchkiss is the UK's leading air conditioning and ventilation contractor.” Source: RevenueBase Database · checked Sep 17, 2026
15	MSE LTD	Indirect evidence	Redditch, United KingdomHQ checked Sep 17, 2026	11-50	101 contacts →
	Indirect evidence “MSE are a midlands based building services company and have over 30 years experience in the commercial and industrial environment working with a broad range of clients.” Source: RevenueBase Database · checked Sep 17, 2026
16	Woodford	Partial evidence	Loughton, United KingdomHQ checked Sep 17, 2026	51-200	99 contacts →
	Partial evidence “Woodford specialise in mechanical and electrical building services for the construction market.” Source: RevenueBase Database · checked Sep 17, 2026
17	DPL Group LTD	Partial evidence	Ipswich, United KingdomHQ checked Sep 17, 2026	51-200	96 contacts →
	Partial evidence “DPL Group consists of multiple divisions, including Mechanical & Electrical Installations, Fire & Security Installations and Renewable Technologies.” Source: RevenueBase Database · checked Sep 17, 2026
18	Spirax Sarco UK And Ireland	Indirect evidence	Cheltenham, United KingdomHQ checked Sep 17, 2026	1,001-5,000	92 contacts →
	Indirect evidence “Why are we here?” Source: RevenueBase Database · checked Sep 17, 2026
19	Oakray Limited	Indirect evidence	Enfield, United KingdomHQ checked Sep 17, 2026	201-500	90 contacts →
	Indirect evidence “Oakray was established in 1979 and we are very proud of our long heritage.” Source: RevenueBase Database · checked Sep 17, 2026
20	Taylor And Fraser	Partial evidence	Paisley, United KingdomHQ checked Sep 17, 2026	51-200	88 contacts →
	Partial evidence “As a leading contractor within the construction and engineering industry, and now a proud subsidiary of Suir Engineering, we deliver projects across a range of markets to our…” Source: RevenueBase Database · checked Sep 17, 2026
21	PJD Mechanical Engineering	Strong evidence	Doncaster, United KingdomHQ checked Sep 17, 2026	51-200	86 contacts →
	Strong evidence “PJD Mechanical Engineering Ltd Ltd has worked with a number of leading clients, operators and technology companies throughout the UK energy sector for over 30 years.” Source: RevenueBase Database · checked Sep 17, 2026
22	CPS Building Services LTD	Partial evidence	Cambridge, United KingdomHQ checked Sep 17, 2026	51-200	85 contacts →
	Partial evidence “CPS Building Services Ltd are experts in design, installation and maintenance of all mechanical and electrical services including renewables.” Source: RevenueBase Database · checked Sep 17, 2026
23	Gloster MEP LTD	Strong evidence	Southwark, United KingdomHQ checked Sep 17, 2026	51-200	85 contacts →
	Strong evidence “Gloster MEP Ltd are a dynamic driven Mechanical and Electrical Contractor, well known within the industry for successfully delivering building services solutions to the Central…” Source: RevenueBase Database · checked Sep 17, 2026
24	Purdy Part Of Sureserve	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	85 contacts →
	Indirect evidence “Who are we?” Source: RevenueBase Database · checked Sep 17, 2026
25	Grant Walker Engineering	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	81 contacts →
	Partial evidence “Grant Walker Engineering specialise in the complete installation of Electrical and Mechanical systems across all work sectors including quality office developments, commercial 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: mechanical contractors for energy. 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 mechanical contractors for energy.
Partial evidence: Its own public description names part of mechanical contractors for energy, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name mechanical contractors for energy. 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 1,418 mechanical contractors for energy based in the United Kingdom

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Mechanical contractors for energy based in the United Kingdom at a glance

As of Sep 17, 2026

35.0%Verified-email coverage

9.7Average contacts per company

11-50Median size (employees)

8.0%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

551

11-50

654

51-200

161

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 1,418 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 mechanical contractors for energy, 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 “mechanical contractors for energy”. 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 mechanical contractors for energy), 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 mechanical contractors for energy, 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, 4,819 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.

Mechanical contractors for energy by metro

Mechanical contractors for energy in London114
Mechanical contractors for energy in Bristol25

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 mechanical contractors for energy, 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 mechanical contractors for energy are there based in the United Kingdom?

RevenueBase identified 1,418 mechanical contractors for energy 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?

Space Engineering Services LTD, headquartered in Bristol, tops this list with the largest team on record.

Which city has the most mechanical contractors for energy?

London leads with 114 headquartered companies, followed by Bristol (25) and Hull (19).

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 4,819 verified decision-maker contacts tracked across these 1,418 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.