Company lists · Data refreshed September 2026

Top 25 Electrical systems integration contractors based in the United Kingdom

Name: Electrical systems integration contractors based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 5,229 companies tracked

RevenueBase identified 5,229 electrical systems integration contractors headquartered in the United Kingdom as of September 2026 and tracks 35,736 professional contacts across them, including 11,386 with verified work emails and 1,628 with mobile numbers. London is the largest hub.

This list covers electrical systems integration contractors 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 29, 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 29, 2026 86% judged on-target in blind review

5,229Companies

35,736Contacts tracked

11,386Verified emails

1,628Mobile numbers

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The 25 largest electrical systems integration contractors based in the United Kingdom

Ranked by team size

Top 25 of 5,229 electrical systems integration contractors based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to electrical systems integration 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	MJ Quinn	Indirect evidence	Prescot, United KingdomHQ checked Sep 29, 2026	1,001-5,000	1,126 contacts →
	Indirect evidence “At MJ Quinn we believe in creating great connections, with our customers, our people and our world.” Source: RevenueBase Database · checked Sep 29, 2026
2	Imtech	Indirect evidence	Staines-upon-thames, United KingdomHQ checked Sep 29, 2026	1,001-5,000	494 contacts →
	Indirect evidence “Imtech has rebranded to Dalkia UK.” Source: RevenueBase Database · checked Sep 29, 2026
3	Balfour Beatty Kilpatrick	Strong evidence	Glasgow, United KingdomHQ checked Sep 29, 2026	1,001-5,000	456 contacts →
	Strong evidence “As a leading mechanical & electrical engineering provider, we design, install and maintain the complex systems and technologies that underpin the UK’s national infrastructure and…” Source: RevenueBase Database · checked Sep 29, 2026
4	Trinity Fire & Security Systems	Indirect evidence	Exeter, United KingdomHQ checked Sep 29, 2026	501-1,000	386 contacts →
	Indirect evidence “Trinity’s mission statement is simple - to provide high quality design, installation, commissioning and long term after care of Fire Detection, Fire Suppression, Life Safety and…” Source: RevenueBase Database · checked Sep 29, 2026
5	Clarkson Evans LTD	Strong evidence	Gloucester, United KingdomHQ checked Sep 29, 2026	501-1,000	331 contacts →
	Strong evidence “With over 850 staff, we are one of the UK’s leading electrical contractors and solar PV installers.” Source: RevenueBase Database · checked Sep 29, 2026
6	Kings Secure Technologies	Partial evidence	Bradford, United KingdomHQ checked Sep 29, 2026	501-1,000	326 contacts →
	Partial evidence “Kings Secure Technologies (KST) is a high-end, enterprise-level systems integrator.” Source: RevenueBase Database · checked Sep 29, 2026
7	MARCH	Indirect evidence	Multiple Locations Uk-wide, United KingdomHQ checked Sep 29, 2026	1,001-5,000	273 contacts →
	Indirect evidence “We are March.” Source: RevenueBase Database · checked Sep 29, 2026
8	Scci Alphatrack	Partial evidence	Harlow, United KingdomHQ checked Sep 29, 2026	201-500	205 contacts →
	Partial evidence “Part of the SCCI Group, SCCI Alphatrack designs, installs, and maintains connected building systems across social housing, commercial property, new builds, and public sector…” Source: RevenueBase Database · checked Sep 29, 2026
9	Actemium UK	Partial evidence	Birmingham, United KingdomHQ checked Sep 29, 2026	501-1,000	190 contacts →
	Partial evidence “At Actemium UK, we are expert electrical, automation and mechanical engineers delivering bespoke engineering solutions across industry, infrastructure and beyond.” Source: RevenueBase Database · checked Sep 29, 2026
10	Abec LTD	Strong evidence	Tewkesbury, United KingdomHQ checked Sep 29, 2026	51-200	175 contacts →
	Strong evidence “ABEC is one of the leading independent Building Management System (BMS) and Electrical Power Monitoring System (EPMS) specialists.” Source: RevenueBase Database · checked Sep 29, 2026
11	Gough & Kelly	Partial evidence	Leeds, United KingdomHQ checked Sep 29, 2026	51-200	157 contacts →
	Partial evidence “A premier provider of security products and services across England, Gough & Kelly was formed in 1988 to influence and inspire the security and electrical marketplace by providing…” Source: RevenueBase Database · checked Sep 29, 2026
12	Asee Group	Strong evidence	Newry, United KingdomHQ checked Sep 29, 2026	51-200	151 contacts →
	Strong evidence “ASEE Group is a leader in mechanical and electrical engineering, specialising in generator integration and full-service installations for 45+ years.” Source: RevenueBase Database · checked Sep 29, 2026
13	Kempston Controls	Partial evidence	Rushden, United KingdomHQ checked Sep 29, 2026	201-500	139 contacts →
	Partial evidence “Kempston Controls is a leader in distributing electrical and mechanical industrial control and automation components.” Source: RevenueBase Database · checked Sep 29, 2026
14	DPS Group	Indirect evidence	Glenrothes, United KingdomHQ checked Sep 29, 2026	51-200	139 contacts →
	Indirect evidence “Shaping the future, together.” Source: RevenueBase Database · checked Sep 29, 2026
15	MCS	Indirect evidence	Bristol, United KingdomHQ checked Sep 29, 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 29, 2026
16	Cema LTD	Partial evidence	Nottingham, United KingdomHQ checked Sep 29, 2026	201-500	131 contacts →
	Partial evidence “CEMA was founded in 1987 in Nottingham, and has quickly grown to become one of the leading electrical engineering companies in the United Kingdom, specialising in understanding…” Source: RevenueBase Database · checked Sep 29, 2026
17	AF Switchgear	Indirect evidence	Sutton-in-ashfield, United KingdomHQ checked Sep 29, 2026	201-500	117 contacts →
	Indirect evidence “AF Switchgear is one of the UK's largest switchgear manufacturers and set the standard for LV Switchgear and Power Distribution.” Source: RevenueBase Database · checked Sep 29, 2026
18	TES Group	Partial evidence	Cookstown, United KingdomHQ checked Sep 29, 2026	51-200	116 contacts →
	Partial evidence “TES are Mechanical & Electrical Specialists, working to the highest standard of engineering excellence.” Source: RevenueBase Database · checked Sep 29, 2026
19	LJJ LTD	Partial evidence	Stockton On Tees, United KingdomHQ checked Sep 29, 2026	201-500	114 contacts →
	Partial evidence “LJJ formed in 2001 as a private limited company and is a multi-disciplined organisation capable of completing major mechanical, electrical and public health service contracts in a…” Source: RevenueBase Database · checked Sep 29, 2026
20	Darke & Taylor LTD	Partial evidence	Oxfordshire, United KingdomHQ checked Sep 29, 2026	51-200	112 contacts →
	Partial 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 29, 2026
21	G & A Barnie Group LTD	Indirect evidence	Inverness, United KingdomHQ checked Sep 29, 2026	201-500	109 contacts →
	Indirect evidence “Premier quality workmanship and personal attention are characteristics of G&A Barnie.” Source: RevenueBase Database · checked Sep 29, 2026
22	PCE Automation	Partial evidence	Beccles, United KingdomHQ checked Sep 29, 2026	201-500	105 contacts →
	Partial evidence “Formed in 1961, PCE Automation Ltd has established itself as an automation solutions provider for a wide range of product handling, assembling and testing systems with a worldwide…” Source: RevenueBase Database · checked Sep 29, 2026
23	Rock Power Connections LTD	Partial evidence	Bromsgrove, United KingdomHQ checked Sep 29, 2026	51-200	105 contacts →
	Partial evidence “Rock Power Connections are experts in electrical connections with a proven track record of quality and safety.” Source: RevenueBase Database · checked Sep 29, 2026
24	EFT Group	Indirect evidence	Southport, United KingdomHQ checked Sep 29, 2026	51-200	102 contacts →
	Indirect evidence “We are EFT Group.” Source: RevenueBase Database · checked Sep 29, 2026
25	MSE LTD	Indirect evidence	Redditch, United KingdomHQ checked Sep 29, 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 29, 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: electrical systems integration 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 electrical systems integration contractors.
Partial evidence: Its own public description names part of electrical systems integration contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name electrical systems integration 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 25 of 5,229 electrical systems integration contractors based in the United Kingdom

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Electrical systems integration contractors based in the United Kingdom at a glance

As of Sep 29, 2026

31.9%Verified-email coverage

4.6%Mobile-number coverage

6.8Average contacts per company

1-10Median size (employees)

6.5%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

3,034

11-50

1,701

51-200

302

201-500

501-1,000

1,001-5,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 31.0d

4,9440–30

6,03431–60

38161–90

690–180

21180+

Company record updated

Median 95.0d

00–30

1,70531–60

11,83361–90

20,48390–180

1,715180+

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 electrical systems integration 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 the United Kingdom whose own description of what they do matches “electrical systems integration 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 electrical systems integration 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 electrical systems integration contractors, 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, 11,386 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 29, 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.

Electrical systems integration contractors by metro

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 electrical systems integration 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 electrical systems integration contractors are there based in the United Kingdom?

RevenueBase identified 5,229 electrical systems integration contractors 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?

MJ Quinn, headquartered in Prescot, tops this list with the largest team on record.

Which city has the most electrical systems integration contractors?

London leads with 339 headquartered companies, followed by Manchester (71) and Nottingham (58).

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 11,386 verified decision-maker contacts tracked across these 5,229 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 29, 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.