Company lists · Data refreshed September 2026

Top 24 Electricians and electrical contractors based in London, United Kingdom

Name: Electricians and 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 327 companies tracked

RevenueBase identified 327 electricians and electrical contractors headquartered in London, United Kingdom as of September 2026 and tracks 1,259 professional contacts across them, including 333 with verified work emails. London is the largest hub.

This list covers electricians and 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

327Companies

1,259Contacts tracked

333Verified emails

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The 24 largest electricians and electrical contractors based in London, United Kingdom

Ranked by team size

Top 24 of 327 electricians and 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 electricians and 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	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
2	Redworx MEP Limited	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	37 contacts →
	Strong evidence “About Us: Established in 2023, Redworx MEP Limited is a dynamic Mechanical and Electrical contractor aiming to make a significant impact in the London market.” Source: RevenueBase Database · checked Sep 16, 2026
3	Hanover Building Services	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	34 contacts →
	Partial evidence “Hanover is an award-winning building services provider that specialises in electrical, mechanical, plumbing, heating and renewable energy installations.” Source: RevenueBase Database · checked Sep 16, 2026
4	ARC Electrical	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	30 contacts →
	Strong evidence “Electrical Contractors and Wholesalers based in Central London and Essex.” Source: RevenueBase Database · checked Sep 16, 2026
5	VHL Mechanical	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	29 contacts →
	Partial evidence “We are one of the leading plumbing, heating and electrical companies nationally, serving residential and commercial clients throughout South East England With almost three decades…” Source: RevenueBase Database · checked Sep 16, 2026
6	Leonari LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	25 contacts →
	Strong evidence “Established in 2014, Leonari is a Mechanical & Electrical contractor working in London and the South East.” Source: RevenueBase Database · checked Sep 16, 2026
7	Niblock Electrical Services	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	22 contacts →
	Strong evidence “Niblock Electrical Services are a M&E contractor based in South East London.” Source: RevenueBase Database · checked Sep 16, 2026
8	Dennis Johns Service Group	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	20 contacts →
	Partial evidence “The Dennis Johns Service Group is a forward thinking group of companies providing, Electrical, CCTV and Access Control, installation and maintenance contracting services.” Source: RevenueBase Database · checked Sep 16, 2026
9	SI Electrical LTD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	14 contacts →
	Partial evidence “SI Electrical provide complete electrical solutions and are renowned for our expertise in lighting and controls.” Source: RevenueBase Database · checked Sep 16, 2026
10	Switched On London LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	13 contacts →
	Strong evidence “Plumbing, Gas and Electrical contractors based in Earlsfield, SW18.” Source: RevenueBase Database · checked Sep 16, 2026
11	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
12	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
13	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
14	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
15	London Electrical Solutions LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	11 contacts →
	Strong evidence “London Electrical Solutions: Experienced Electricians operating across London Residential & Commercial Electricians serving Greater London London Electrical Solutions is a…” Source: RevenueBase Database · checked Sep 16, 2026
16	TNS Electrical Contractors LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	11 contacts →
	Strong evidence “We are TNS Electrical Contractors Ltd and based in East London with over 15 years of experience in the electrical industry.” Source: RevenueBase Database · checked Sep 16, 2026
17	Intrelec LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	9 contacts →
	Strong evidence “Intrelec are NICEIC Approved Mechanical & Electrical Contractors in London providing M&E design, installation and maintenance services to commercial, industrial and residential…” Source: RevenueBase Database · checked Sep 16, 2026
18	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
19	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
20	Propertyrun Electrical Contractors	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	7 contacts →
	Strong evidence “PropertyRun Contracts Ltd are approved electrical contractors, that provide a full range of services all over London.” Source: RevenueBase Database · checked Sep 16, 2026
21	Newmay Electrical Services LTD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	7 contacts →
	Partial evidence “We are pleased to offer our expertise across a comprehensive range of electrical services, including full domestic and commercial installation, full and part rewires, home…” Source: RevenueBase Database · checked Sep 16, 2026
22	R P Bray Electrical Contractors	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	6 contacts →
	Partial evidence “R P Bray carry out electrical installation works to domestic, commercial and industrial projects, complete with design and testing facilities, specializing in the hotel, leisure…” Source: RevenueBase Database · checked Sep 16, 2026
23	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
24	Polkadot Plumbers	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	6 contacts →
	Partial evidence “NEW for 2023: We now offer ELECTRICALSand RENEWABLES as well as PLUMBING and HEATING!” 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: electricians and 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 electricians and electrical contractors.
Partial evidence: Its own public description names part of electricians and electrical contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name electricians and 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 24 of 327 electricians and electrical contractors based in London, United Kingdom

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Electricians and electrical contractors based in London, United Kingdom at a glance

As of Sep 16, 2026

26.4%Verified-email coverage

3.9Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

220

11-50

51-200

201-500

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 327 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 electricians and 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 “electricians and 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 electricians and 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 electricians and 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, 333 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.

Electricians and electrical contractors by metro in the United Kingdom

Electricians and electrical contractors in London327
Electricians and electrical contractors in Bristol60
Electricians and electrical contractors in Manchester60
Electricians and electrical contractors in Nottingham56
Electricians and electrical contractors in Leeds49
Electricians and electrical contractors in Glasgow48
Electricians and electrical contractors in Birmingham46
Electricians and electrical contractors in Leicester43
Electricians and electrical contractors in Sheffield41
Electricians and electrical contractors in Southampton40
Electricians and electrical contractors in Hull37
Electricians and electrical contractors in Liverpool31
Electricians and electrical contractors in Northampton29
Electricians and electrical contractors in Gloucester28
Electricians and electrical contractors in Peterborough28
Electricians and electrical contractors in Huddersfield27
Electricians and electrical contractors in Portsmouth27
Electricians and electrical contractors in Warrington27
Electricians and electrical contractors in Bournemouth26
Electricians and electrical contractors in Edinburgh26

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 electricians and 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 electricians and electrical contractors are there based in London, United Kingdom?

RevenueBase identified 327 electricians and 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?

Grant Walker Engineering, headquartered in London, tops this list with the largest team on record.

Which city has the most electricians and electrical contractors?

London leads with 327 headquartered companies, followed by Bristol (60) and Manchester (60).

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 333 verified decision-maker contacts tracked across these 327 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.