Company lists · Data refreshed September 2026

Top 25 Electrical testing and commissioning firms based in the United Kingdom

Name: Electrical testing and commissioning firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 3,157 companies tracked

RevenueBase identified 3,157 electrical testing and commissioning firms headquartered in the United Kingdom as of September 2026 and tracks 16,949 professional contacts across them, including 4,373 with verified work emails. London is the largest hub.

This list covers electrical testing and commissioning 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 19, 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 19, 2026 86% judged on-target in blind review

3,157Companies

16,949Contacts tracked

4,373Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest electrical testing and commissioning firms based in the United Kingdom

Ranked by team size

Top 25 of 3,157 electrical testing and commissioning firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to electrical testing and commissioning firms: 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	Quartzelec Limited	Partial evidence	Rugby, United KingdomHQ checked Sep 19, 2026	501-1,000	412 contacts →
	Partial evidence “Quartzelec is a leading independent electrical engineering group delivering solutions and services in both UK and global markets.” Source: RevenueBase Database · checked Sep 19, 2026
2	JKM	Partial evidence	Bedlington, United KingdomHQ checked Sep 19, 2026	201-500	183 contacts →
	Partial evidence “JKM Electricals is a well-established company which has built up a first-class reputation, Through successfully delivering high-quality workmanship.” Source: RevenueBase Database · checked Sep 19, 2026
3	Guardian Electrical Compliance LTD	Partial evidence	Sheffield, United KingdomHQ checked Sep 19, 2026	51-200	137 contacts →
	Partial evidence “Founded in 2010, Guardian Electrical Compliance Ltd have become the market leaders in terms of Duty Holder guidance, technical & legislative support, site delivery and after sales…” Source: RevenueBase Database · checked Sep 19, 2026
4	Darke & Taylor LTD	Indirect evidence	Oxfordshire, United KingdomHQ checked Sep 19, 2026	51-200	112 contacts →
	Indirect 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 19, 2026
5	G & A Barnie Group LTD	Indirect evidence	Inverness, United KingdomHQ checked Sep 19, 2026	201-500	109 contacts →
	Indirect evidence “Premier quality workmanship and personal attention are characteristics of G&A Barnie.” Source: RevenueBase Database · checked Sep 19, 2026
6	Rock Power Connections LTD	Partial evidence	Bromsgrove, United KingdomHQ checked Sep 19, 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 19, 2026
7	RGE Services	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	94 contacts →
	Partial evidence “We’ve been providing fire and electrical compliance services for over 30 years, supporting clients across London and the Southeast with our locally based engineers.” Source: RevenueBase Database · checked Sep 19, 2026
8	Sureserve Compliance Fire	Strong evidence	Horsham, United KingdomHQ checked Sep 19, 2026	501-1,000	94 contacts →
	Strong evidence “With over 35 Years expertise, Sureserve Compliance Fire is an Industry leading business excelling in delivering Fire and Electrical compliance and testing services to housing…” Source: RevenueBase Database · checked Sep 19, 2026
9	Seaward	Strong evidence	Peterlee, United KingdomHQ checked Sep 19, 2026	51-200	83 contacts →
	Strong evidence “With over 75 years’ experience at the cutting edge of electrical safety testing, our expertise and innovations have produced a number of world firsts.” Source: RevenueBase Database · checked Sep 19, 2026
10	GTDS	Partial evidence	Hill, United KingdomHQ checked Sep 19, 2026	51-200	82 contacts →
	Partial evidence “GTDS was established in July 2004 to provide specialist installation and commissioning services to the major manufacturers, National Grid and the Distribution Network Operators…” Source: RevenueBase Database · checked Sep 19, 2026
11	AKD	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 19, 2026	51-200	79 contacts →
	Indirect evidence “AKD’s clients get quick results, normally leading to reduced costs and gaining an improved service.” Source: RevenueBase Database · checked Sep 19, 2026
12	Fletcher Moorland	Partial evidence	Stoke On Trent, United KingdomHQ checked Sep 19, 2026	51-200	75 contacts →
	Partial evidence “Fletcher Moorland Ltd, are the experts in repairing, replacing, or upgrading Electric Motors, Pumps, Air Handling Units, Inverter Drives, Servo Motors, HMIs, PCBs, PSUs and more.” Source: RevenueBase Database · checked Sep 19, 2026
13	MKE Engineering Group	Partial evidence	Sittingbourne, United KingdomHQ checked Sep 19, 2026	51-200	63 contacts →
	Partial evidence “MKE Engineering (Mid Kent Electrical) is the largest independent engineering service provider of its kind in the South East, operating from 3 different sites covering Kent…” Source: RevenueBase Database · checked Sep 19, 2026
14	C&p Engineering Services LTD	Partial evidence	Swansea, United KingdomHQ checked Sep 19, 2026	51-200	62 contacts →
	Partial evidence “Through our integrated electrical, control & instrumentation services we design, construct & deliver complete projects & provide maintenance services to companies throughout the…” Source: RevenueBase Database · checked Sep 19, 2026
15	LCA Group	Strong evidence	Harwarden, United KingdomHQ checked Sep 19, 2026	51-200	58 contacts →
	Strong evidence “LCA Group is a leading provider of project design, manufacture, installation, commissioning and maintenance of electrical, instrumentation and control systems throughout the UK…” Source: RevenueBase Database · checked Sep 19, 2026
16	Premier Electrics	Partial evidence	Magherafelt, United KingdomHQ checked Sep 19, 2026	51-200	58 contacts →
	Partial evidence “Premier Electrics have been delivering exciting projects throughout Ireland, UK and Europe since 1993.” Source: RevenueBase Database · checked Sep 19, 2026
17	Orton Group LTD	Partial evidence	Wombourne, United KingdomHQ checked Sep 19, 2026	51-200	56 contacts →
	Partial evidence “01902 894871 Marking its 25th anniversary this year, Orton is a leading provider of electrical, mechanical, installation and maintenance services covering both commercial and…” Source: RevenueBase Database · checked Sep 19, 2026
18	Pitts Wilson Limited	Partial evidence	Bradford, United KingdomHQ checked Sep 19, 2026	51-200	55 contacts →
	Partial evidence “Mechanical & Electrical Design and Installation company specialising in Commercial, Retail, Industrial and Leisure Projects.” Source: RevenueBase Database · checked Sep 19, 2026
19	Hvss High Voltage Substation Services LTD	Partial evidence	Watford, United KingdomHQ checked Sep 19, 2026	11-50	55 contacts →
	Partial evidence “HVSS (High Voltage Substation Services) was formed in 2009 specializing in installation and commissioning of High Voltage Substations Systems up to 400kV.” Source: RevenueBase Database · checked Sep 19, 2026
20	Lantei	Strong evidence	Preston, United KingdomHQ checked Sep 19, 2026	51-200	53 contacts →
	Strong evidence “We are the first choice trusted partner, supporting businesses in meeting their regulatory electrical testing requirements.” Source: RevenueBase Database · checked Sep 19, 2026
21	RJ Power	Partial evidence	Sidcup, United KingdomHQ checked Sep 19, 2026	51-200	53 contacts →
	Partial evidence “RJ Power Group is a specialist electrical contracting business, providing engineering solutions in the power sector.” Source: RevenueBase Database · checked Sep 19, 2026
22	The Wiggett Group LTD	Partial evidence	Brentwood, United KingdomHQ checked Sep 19, 2026	201-500	51 contacts →
	Partial evidence “Wiggett Electrical has gone from strength to strength.” Source: RevenueBase Database · checked Sep 19, 2026
23	Monitra	Strong evidence	Manchester, United KingdomHQ checked Sep 19, 2026	51-200	51 contacts →
	Strong evidence “Monitra (formerly HVPD) are experts in the field of Partial Discharge (PD) testing and monitoring of Medium Voltage and High Voltage electrical equipment, which can be performed…” Source: RevenueBase Database · checked Sep 19, 2026
24	NES	Partial evidence	Inverness, United KingdomHQ checked Sep 19, 2026	11-50	51 contacts →
	Partial evidence “NES is an Industrial and Commercial Electrical Engineering and Contracting business, based in the North and North East of Scotland.” Source: RevenueBase Database · checked Sep 19, 2026
25	Lloyd Morris Electrical LTD	Partial evidence	Wrexham, United KingdomHQ checked Sep 19, 2026	51-200	47 contacts →
	Partial evidence “Lloyd Morris Electrical Limited is a company of Electrical Engineers, specialising in the design, manufacture and installation of Electrical Distribution and Control Systems for…” Source: RevenueBase Database · checked Sep 19, 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 testing and commissioning 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 electrical testing and commissioning firms.
Partial evidence: Its own public description names part of electrical testing and commissioning firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name electrical testing and commissioning 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 3,157 electrical testing and commissioning firms based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 4,373 reachable decision-makers.

Free signup · no credit card

View the full list →

Electrical testing and commissioning firms based in the United Kingdom at a glance

As of Sep 19, 2026

25.8%Verified-email coverage

5.4Average contacts per company

1-10Median size (employees)

6.0%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

2,039

11-50

902

51-200

123

201-500

501-1,000

1,001-5,000

10001+

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 3,157 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 electrical testing and commissioning 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 “electrical testing and commissioning 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 electrical testing and commissioning 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 electrical testing and commissioning 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, 4,373 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 19, 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 testing and commissioning firms by metro

Electrical testing and commissioning firms in London190
Electrical testing and commissioning firms in Manchester48
Electrical testing and commissioning firms in Bristol33
Electrical testing and commissioning firms in Nottingham29
Electrical testing and commissioning firms in Birmingham28
Electrical testing and commissioning firms in Sheffield28
Electrical testing and commissioning firms in Leicester27
Electrical testing and commissioning firms in Glasgow26

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 testing and commissioning 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 electrical testing and commissioning firms are there based in the United Kingdom?

RevenueBase identified 3,157 electrical testing and commissioning 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?

Quartzelec Limited, headquartered in Rugby, tops this list with the largest team on record.

Which city has the most electrical testing and commissioning firms?

London leads with 190 headquartered companies, followed by Manchester (48) and Bristol (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 4,373 verified decision-maker contacts tracked across these 3,157 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 19, 2026.

Ready to reach these companies? Verified emails and direct dials for all 3,157 electrical testing and commissioning firms based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Electrical testing and commissioning firms by geography

Browse the directory

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.