Company lists · Data refreshed September 2026

Top 23 Data center electrical contractors based in London, United Kingdom

Name: Data center electrical contractors based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 184 companies tracked

RevenueBase identified 184 data center electrical contractors headquartered in London, United Kingdom as of September 2026 and tracks 3,051 professional contacts across them, including 913 with verified work emails. London is the largest hub.

This list covers data center electrical contractors headquartered in London, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 16, 2026 86% judged on-target in blind review

184Companies

3,051Contacts tracked

913Verified emails

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The 23 largest data center electrical contractors based in London, United Kingdom

Ranked by team size

Top 23 of 184 data center electrical contractors based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to data center electrical contractors: 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	J Brand LTD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	n/a	1,245 contacts →
	Partial evidence “Originally set up in 1933 by Joseph Brand as an electrical contracting and repair business in Margaret Street W1, the company today still operates today with the same guiding…” Source: RevenueBase Database · checked Sep 16, 2026
2	ONNEC	Indirect evidence	London, United KingdomHQ checked Sep 16, 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 16, 2026
3	Smart Managed Solutions	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	259 contacts →
	Strong 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 16, 2026
4	LMG Lmgiq.com	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	153 contacts →
	Indirect evidence “For 40 years, LMG has delivered secure, resilient and proven digital infrastructure solutions across the built environment.” Source: RevenueBase Database · checked Sep 16, 2026
5	Grant Walker Engineering	Partial evidence	London, United KingdomHQ checked Sep 16, 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 16, 2026
6	Phoenix ME	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	33 contacts →
	Partial evidence “We stand as a well-established industry leader, specialising in the design, installation, and commissioning of mechanical and electrical systems across diverse sectors.” Source: RevenueBase Database · checked Sep 16, 2026
7	Dacc Europe Limited	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	31 contacts →
	Indirect evidence “DACC Europe is a leading structured cable and network infrastructure provider established in 1996 in Docklands London, enjoying year on year growth and fully manufacturer…” Source: RevenueBase Database · checked Sep 16, 2026
8	Deerns UK	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	24 contacts →
	Partial 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 16, 2026
9	Cole Group	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	12 contacts →
	Partial evidence “At COLE Group, we specialize in delivering outstanding electrical solutions for both new build and refurbishment projects.” Source: RevenueBase Database · checked Sep 16, 2026
10	Concepto Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	12 contacts →
	Partial evidence “Concepto AV is an electrical-led technology company delivering high-quality electrical installations across residential and commercial projects in London.” Source: RevenueBase Database · checked Sep 16, 2026
11	GPM London LTD	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	12 contacts →
	Indirect evidence “At GPM London, we specialise in delivering hassle-free, professional MEP solutions tailored to your needs, no matter the size or complexity of the job.” Source: RevenueBase Database · checked Sep 16, 2026
12	Rederic LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	12 contacts →
	Strong evidence “Here at Rederic, we leverage our wealth of industry knowledge and expertise to provide efficient, personalised solutions for all mechanical & electrical, audiovisual, data…” Source: RevenueBase Database · checked Sep 16, 2026
13	SPL Construct LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	12 contacts →
	Strong evidence “As fully qualified, time served electrical contractors, we have a wealth of knowledge in the electrical industry, predominantly carrying out a wide range of services from design…” Source: RevenueBase Database · checked Sep 16, 2026
14	NM Cabling Solutions	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	9 contacts →
	Partial evidence “NM Cabling are a leading data cabling installer assisting IT, Technology, Value Added Re-sellers and Telephone Systems Companies in the London, South and surrounding areas with a…” Source: RevenueBase Database · checked Sep 16, 2026
15	JSJ Smart Homes	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	9 contacts →
	Strong evidence “JSJ Smart Homes was formed as a specialised contractor in the field of domestic installations, covering all aspects of electrical installs, such as home automation and data…” Source: RevenueBase Database · checked Sep 16, 2026
16	NES Security Limited	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	7 contacts →
	Partial evidence “An independent electrical services company providing bespoke and high-quality CCTV, Security, Access control and Automation technology systems to private and corporate clients in…” Source: RevenueBase Database · checked Sep 16, 2026
17	Total Electric Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	6 contacts →
	Partial evidence “Established in 2006, Total Electric Solutions Ltd provides a complete electrical package from the design & tendering process through to the final installation & after care.” Source: RevenueBase Database · checked Sep 16, 2026
18	Harrison HOW LTD	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	6 contacts →
	Indirect evidence “Harrison How Limited are situated in the heart of London and have been serving clients since 1939.” Source: RevenueBase Database · checked Sep 16, 2026
19	Vezo Energy	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	5 contacts →
	Partial evidence “Vezo Energy delivers professional electrical, construction and facilities services for offices, leisure facilities, hospitals, property managers, commercial properties and luxury…” Source: RevenueBase Database · checked Sep 16, 2026
20	Dacpros	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	5 contacts →
	Strong evidence “Data Centre Professionals Ltd (also known as Dacpros) is a leading smart-hand service provider in the UK, renowned for its proactive and innovative approach.” Source: RevenueBase Database · checked Sep 16, 2026
21	Eightcube Solutions	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	4 contacts →
	Partial evidence “EIGHTCUBE, based in London, is a fast-growing and ambitious electrical design and build business delivering high quality projects for both domestic and commercial properties and…” Source: RevenueBase Database · checked Sep 16, 2026
22	Bextec Electrical Services LTD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	4 contacts →
	Partial evidence “Bextec Electrical are a London based company operating in the commercial and residential sectors of the electrical industry.” Source: RevenueBase Database · checked Sep 16, 2026
23	MPE Electrical Contractors LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	3 contacts →
	Strong evidence “MPE Electrical Contractors are a London /Kent based company specialising in all aspects of electrical installation within the residential, commercial and industrial sectors.” Source: RevenueBase Database · checked Sep 16, 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: data center electrical contractors. 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 data center electrical contractors.
Partial evidence: Its own public description names part of data center electrical contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name data center electrical contractors. 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 23 of 184 data center electrical contractors based in London, United Kingdom

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Data center electrical contractors based in London, United Kingdom at a glance

As of Sep 16, 2026

29.9%Verified-email coverage

16.6Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

112

11-50

51-200

201-500

501-1,000

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 184 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 data center electrical contractors, 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 London, United Kingdom whose own description of what they do matches “data center electrical contractors”. 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 data center electrical contractors), 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 data center electrical contractors, and records with no verified work email. Companies headquartered outside London 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, 913 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.

Data center electrical contractors by metro in the United Kingdom

Data center electrical contractors in London184
Data center electrical contractors in Manchester36
Data center electrical contractors in Nottingham33
Data center electrical contractors in Bristol26
Data center electrical contractors in Glasgow25
Data center electrical contractors in Leeds25
Data center electrical contractors in Southampton25

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 data center electrical contractors, 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 data center electrical contractors are there based in London, United Kingdom?

RevenueBase identified 184 data center electrical contractors headquartered in London, 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?

J Brand LTD, headquartered in London, tops this list with the largest team on record.

Which city has the most data center electrical contractors?

London leads with 184 headquartered companies, followed by Manchester (36) and Nottingham (33).

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 913 verified decision-maker contacts tracked across these 184 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.