Company lists · Data verified August 2026

Top 25 Data center consulting firms based in the United Kingdom

Name: Data center consulting firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 542 companies tracked

There are 542 data center consulting firms headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 8,529 professional contacts across them, including 3,201 with verified work emails and 824 with mobile numbers. London is the largest hub.

This list covers data center consulting 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. Data current as of August 28, 2026.

542Companies

8,529Contacts tracked

3,201Verified emails

824Mobile numbers

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The 25 largest data center consulting firms based in the United Kingdom

Ranked by team size

Top 25 of 542 data center consulting firms based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	ONNEC	London	501-1,000	580	375
2	Maintech, Incorporated	London	501-1,000	529	245
3	Colt Data Centre Services	London	201-500	421	235
4	Zenzero	Coventry	501-1,000	403	281
5	Smart Managed Solutions	London	501-1,000	264	152
6	Sudlows	London	201-500	230	103
7	Proact IT Group AB	Leeds	1,001-5,000	224	79
8	Proact IT UK	Glasgow	1,001-5,000	206	139
9	Datalec Precision Installations Limited	Buntingford Herts	51-200	179	107
10	Creative ITC	London	201-500	175	99
11	MICIM	Reading	51-200	91	52
12	Sysgroup	London	51-200	88	55
13	Technimove	London	51-200	86	55
14	Excool	Bromsgrove	201-500	86	4
15	ORM	London	51-200	82	10
16	Future-Tech	Wokingham	51-200	80	33
17	Brightsolid	Dundee	51-200	77	50
18	6point6 Part Of Accenture	London	201-500	73	29
19	Teknicor Corporation	London	51-200	70	41
20	Cogeco Peer 1	Southampton	501-1,000	67	7
21	Onyx Group	Gateshead	51-200	66	2
22	IDS Group	London	51-200	55	25
23	Nesevo Group	Birmingham	51-200	48	30
24	Phoenix Trescray	London London	51-200	39	22
25	Bladeroom Data Centres	Leamington Spa	51-200	36	14

Showing 25 of 542 data center consulting firms based in the United Kingdom

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Data center consulting firms based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 218 HQs

824Contacts with mobile numbers

2Emails re-verified in last 30 days

Companies by employee count

1-10

319

11-50

151

51-200

201-500

501-1,000

1,001-5,000

Data center consulting firms by metro

Metro	Companies
Data center consulting firms in London	218
Data center consulting firms in Manchester	11
Data center consulting firms in Reading	11
Data center consulting firms in Leeds	9
Data center consulting firms in Milton Keynes	7
Data center consulting firms in Bristol	7
Data center consulting firms in Birmingham	5

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “data center consulting firms”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 2 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many data center consulting firms are there based in the United Kingdom?

There are 542 data center consulting firms headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

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

Which city has the most data center consulting firms?

London leads with 218 headquartered companies, followed by Manchester (11) and Reading (11).

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 3,201 verified decision-maker contacts tracked across these 542 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.