Company lists · Data refreshed September 2026

Top 25 Mission critical facility builders based in the United Kingdom

Name: Mission critical facility builders based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 88 companies tracked

RevenueBase identified 88 mission critical facility builders headquartered in the United Kingdom as of September 2026 and tracks 3,702 professional contacts across them, including 1,934 with verified work emails. London is the largest hub.

This list covers mission critical facility builders 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 20, 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 20, 2026 86% judged on-target in blind review

88Companies

3,702Contacts tracked

1,934Verified emails

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The 25 largest mission critical facility builders based in the United Kingdom

Ranked by team size

Top 25 of 88 mission critical facility builders based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to mission critical facility builders: 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	RED Engineering Design	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	785 contacts →
	Strong evidence “RED Engineering Design, a company of Tractebel, is a global engineering consultancy specialising in the design of complex, mission-critical Data Centre and digital infrastructure…” Source: RevenueBase Database · checked Sep 20, 2026
2	ONNEC	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	585 contacts →
	Indirect evidence “Onnec is a leading partner for IT Infrastructure design, installation and operational support services.” Source: RevenueBase Database · checked Sep 20, 2026
3	Colt Data Centre Services	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	415 contacts →
	Indirect evidence “At Colt Data Centre Services, we aspire to our customers’ success, ensuring your growth is supported by the best infrastructure solution for your business’ unique vision.” Source: RevenueBase Database · checked Sep 20, 2026
4	Smart Managed Solutions	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	259 contacts →
	Partial evidence “Over the last 15 years, we have worked in the world's top data centres and commercial facilities, providing quality engineering services.” Source: RevenueBase Database · checked Sep 20, 2026
5	Sudlows	Strong evidence	Manchester, United KingdomHQ checked Sep 20, 2026	201-500	228 contacts →
	Strong evidence “Sudlows is a multi-award winning Critical Infrastructures, Enterprise Services and Facilities Management specialist which provides a full range of technical services for…” Source: RevenueBase Database · checked Sep 20, 2026
6	Datalec Precision Installations Limited	Indirect evidence	Buntingford Herts, United KingdomHQ checked Sep 20, 2026	51-200	178 contacts →
	Indirect evidence “OFFICIAL ACCOUNT* Datalec Precision Installations provides world-class data centre design, build, and installation services that leverage unique technical expertise, including…” Source: RevenueBase Database · checked Sep 20, 2026
7	DOWDS	Indirect evidence	Ballymena, United KingdomHQ checked Sep 20, 2026	201-500	164 contacts →
	Indirect evidence “With 45+ years in business, Dowds expertise spans the full lifecycle of complex build environments – from initial design and systems integration to final handover and beyond.” Source: RevenueBase Database · checked Sep 20, 2026
8	MICIM	Strong evidence	Reading, United KingdomHQ checked Sep 20, 2026	51-200	92 contacts →
	Strong evidence “The founders of MiCiM (Mission Critical Management)[pronounced "My Sim"] created the company with a shared vision: to offer a focused, end-to-end, hands-on project management and…” Source: RevenueBase Database · checked Sep 20, 2026
9	Future-Tech	Indirect evidence	Wokingham, United KingdomHQ checked Sep 20, 2026	51-200	82 contacts →
	Indirect evidence “Future-tech is a specialist data centre engineering services provider.” Source: RevenueBase Database · checked Sep 20, 2026
10	IDS Group	Indirect evidence	Fleet, United KingdomHQ checked Sep 20, 2026	51-200	56 contacts →
	Indirect evidence “IDS Group are a global data centre and colocation specialist providing a variety of services to support our customers around the world from both our UK and Netherlands office…” Source: RevenueBase Database · checked Sep 20, 2026
11	Durata	Partial evidence	Middlesbrough, United KingdomHQ checked Sep 20, 2026	11-50	47 contacts →
	Partial evidence “Durata is the trusted partner your business needs for critical power, legacy optimisation and modular data centre solutions.” Source: RevenueBase Database · checked Sep 20, 2026
12	BRG Technologies	Strong evidence	Cheltenham, United KingdomHQ checked Sep 20, 2026	51-200	46 contacts →
	Strong evidence “BRG Technologies is the global leader in the off-site construction of mission-critical facilities, specialising in the data centre and healthcare sectors.” Source: RevenueBase Database · checked Sep 20, 2026
13	Phoenix Trescray	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	39 contacts →
	Indirect evidence “We are a leading IT installation company offering complete infrastructure solutions within data centre and commercial sectors.” Source: RevenueBase Database · checked Sep 20, 2026
14	Bladeroom Data Centres	Indirect evidence	Cheltenham, United KingdomHQ checked Sep 20, 2026	51-200	37 contacts →
	Indirect evidence “BladeRoom Data Centres are designed to be globally consistent and deployable anywhere in the world with speed and precision.” Source: RevenueBase Database · checked Sep 20, 2026
15	Studionwa	Indirect evidence	St Albans, United KingdomHQ checked Sep 20, 2026	11-50	33 contacts →
	Indirect evidence “studioNWA is founded on a vast understanding and experience of the data centre design.” Source: RevenueBase Database · checked Sep 20, 2026
16	PPA Phillipspage Associates	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	31 contacts →
	Strong evidence “Formed in 2008 PPA is a specialist Mission Critical Solutions consultancy delivering turnkey Data Centre solutions including Mechanical, Electrical, Public Health, ICT and…” Source: RevenueBase Database · checked Sep 20, 2026
17	Infiniti IT Limited	Indirect evidence	Witney, United KingdomHQ checked Sep 20, 2026	1-10	29 contacts →
	Indirect evidence “INFINITI is a one-stop data centre services provider with an eye for detail and outstanding customer service.” Source: RevenueBase Database · checked Sep 20, 2026
18	Critical Facilities Solutions LTD	Strong evidence	Witham, United KingdomHQ checked Sep 20, 2026	51-200	27 contacts →
	Strong evidence “Data Centre Solutions Critical Facilities Solutions (CFS) is a world-class facilities services business with more than 25 years’ experience working in Data Centre and Enterprise…” Source: RevenueBase Database · checked Sep 20, 2026
19	Prism DCS	Indirect evidence	Watford, United KingdomHQ checked Sep 20, 2026	51-200	26 contacts →
	Indirect evidence “Prism DCS is a data centre solutions provider specialising in the provision of hot & cold aisle containment, server cabinets, and security cages.” Source: RevenueBase Database · checked Sep 20, 2026
20	JB Associates Construction Consultancy	Partial evidence	Lymington, United KingdomHQ checked Sep 20, 2026	11-50	25 contacts →
	Partial evidence “Established over 20 years ago, JB Associates is an independent, specialist data centre and critical infrastructure consultancy delivering agile, reliable and relationship driven…” Source: RevenueBase Database · checked Sep 20, 2026
21	Deerns UK	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	24 contacts →
	Indirect evidence “An independent mechanical and electrical engineering firm which operates worldwide, Deerns has the capacity to make ideas a reality.” Source: RevenueBase Database · checked Sep 20, 2026
22	Workspace Technology LTD	Strong evidence	Sutton Coldfield, United KingdomHQ checked Sep 20, 2026	11-50	23 contacts →
	Strong evidence “Workspace Technology Ltd provide expertly engineered Mission Critical Infrastructure, Rack Colocation Hosting and Maintenance & Support Services.” Source: RevenueBase Database · checked Sep 20, 2026
23	Global Technical Realty	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	22 contacts →
	Indirect evidence “Global Technical Realty (GTR) has the data center experience you need.” Source: RevenueBase Database · checked Sep 20, 2026
24	FEL Group LTD	Indirect evidence	Scunthorpe, United KingdomHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “Protecting the Heartbeat of British Business'' We create, maintain and manage controlled live environments vital for the operation of thousands of servers at the heart of the UK…” Source: RevenueBase Database · checked Sep 20, 2026
25	HAZ Mission Critical	Strong evidence	Berkshire, United KingdomHQ checked Sep 20, 2026	51-200	19 contacts →
	Strong evidence “Haz Mission Critical provides professional Mission Critical support to clients around the world.” Source: RevenueBase Database · checked Sep 20, 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: mission critical facility builders. 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 mission critical facility builders.
Partial evidence: Its own public description names part of mission critical facility builders, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name mission critical facility builders. 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 88 mission critical facility builders based in the United Kingdom

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Mission critical facility builders based in the United Kingdom at a glance

As of Sep 20, 2026

52.2%Verified-email coverage

42.1Average contacts per company

11-50Median size (employees)

30.7%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 88 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 mission critical facility builders, 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 “mission critical facility builders”. 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 mission critical facility builders), 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 mission critical facility builders, 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, 1,934 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 20, 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.

Mission critical facility builders by metro

Mission critical facility builders in London27

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 mission critical facility builders, 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 mission critical facility builders are there based in the United Kingdom?

RevenueBase identified 88 mission critical facility builders 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?

RED Engineering Design, headquartered in London, tops this list with the largest team on record.

Which city has the most mission critical facility builders?

London leads with 27 headquartered companies, followed by Birmingham (2) and Manchester (2).

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 1,934 verified decision-maker contacts tracked across these 88 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 20, 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.