Company lists · Data refreshed September 2026
Top 25 Building systems engineering firms based in the United Kingdom
RevenueBase identified 872 building systems engineering firms headquartered in the United Kingdom as of September 2026 and tracks 11,974 professional contacts across them, including 5,389 with verified work emails. London is the largest hub.
This list covers building systems 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 16, 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.
The 25 largest building systems engineering firms based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 16, 2026Thanks. The Data Team will review it. | |||||
| 2 | 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 16, 2026Thanks. The Data Team will review it. | |||||
| 3 | 146 contacts → | ||||
Partial evidence “Harley Haddow are Civil, Structural, Mechanical, Electrical, Building Performance & Sustainability and Geotechnical Consulting Engineers.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 4 | 138 contacts → | ||||
Strong 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 16, 2026Thanks. The Data Team will review it. | |||||
| 5 | 127 contacts → | ||||
Strong 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 16, 2026Thanks. The Data Team will review it. | |||||
| 6 | 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 16, 2026Thanks. The Data Team will review it. | |||||
| 7 | 112 contacts → | ||||
Strong evidence “Our mission is to excel in the design, installation and maintenance of the electro-technical systems that connect to create fit for purpose building environments.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 8 | 111 contacts → | ||||
Partial 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 16, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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 16, 2026Thanks. The Data Team will review it. | |||||
| 10 | 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 16, 2026Thanks. The Data Team will review it. | |||||
| 11 | 103 contacts → | ||||
Strong 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 16, 2026Thanks. The Data Team will review it. | |||||
| 12 | 102 contacts → | ||||
Indirect evidence “We are EFT Group.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 13 | 99 contacts → | ||||
Partial evidence “Woodford specialise in mechanical and electrical building services for the construction market.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 14 | 98 contacts → | ||||
Partial evidence “We are an independent Building Services Consultancy providing national coverage.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 15 | 95 contacts → | ||||
Strong 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 16, 2026Thanks. The Data Team will review it. | |||||
| 16 | 89 contacts → | ||||
Indirect evidence “Narro is a team of Consulting Structural & Civil Engineers with offices in Edinburgh, Glasgow, Stirling, Inverness, Aberdeen, Newcastle, and London.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 17 | 87 contacts → | ||||
Strong evidence “SDS is a forward-looking, dynamic construction consultancy specialising in the design of sustainable, mechanical and electrical engineering systems for buildings.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 18 | 81 contacts → | ||||
Strong 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 16, 2026Thanks. The Data Team will review it. | |||||
| 19 | 79 contacts → | ||||
Strong evidence “Established in 1955, we are a leading mechanical and electrical building services engineering contractor operating throughout the United Kingdom and Ireland.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 20 | 78 contacts → | ||||
Strong evidence “Principle One provides Systems Engineering, Architecture and Business Consulting services within the Law Enforcement, National Security, Health and wider public sector.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 21 | 77 contacts → | ||||
Indirect evidence “Will Rudd are Consulting Civil & Structural Engineers with an excellent track record in delivering a quality product.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 22 | 75 contacts → | ||||
Partial evidence “Synoptix was formed in 2011 to provide engineering solutions across various technical industries.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 23 | 73 contacts → | ||||
Partial evidence “Delap & Waller Mechanical and Electrical Building Services Engineers was founded in 1911, and to this day we remain a leader in the field of Mechanical and Electrical Building…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 24 | 69 contacts → | ||||
Partial evidence “PWP Building Services is a UK provider of mechanical and electrical building services, fire, security and facilities management – supporting commercial organisations across…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 25 | 68 contacts → | ||||
Strong evidence “JDP is a Building Services Engineering Consultancy with offices in Reading, employing engineers with practical design skills.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
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: building systems 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 building systems engineering firms.
- Partial evidence
- Its own public description names part of building systems engineering firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name building systems 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 872 building systems engineering firms based in the United Kingdom
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Building systems engineering firms based in the United Kingdom at a glance
As of Sep 16, 2026Companies by employee count
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 872 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 building systems 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 “building systems 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 building systems 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 building systems 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, 5,389 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 16, 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.
Building systems engineering firms by metro
- Building systems engineering firms in London128
- Building systems engineering firms in Bristol28
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 building systems 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 building systems engineering firms are there based in the United Kingdom?
RevenueBase identified 872 building systems 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 building systems engineering firms?
London leads with 128 headquartered companies, followed by Bristol (28) and Manchester (20).
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 5,389 verified decision-maker contacts tracked across these 872 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 16, 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.
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