Company lists · Data refreshed October 2026

Top 22 Electrical construction companies based in London, United Kingdom

Name: Electrical construction companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 12, 2026 327 companies tracked

RevenueBase identified 327 company matches for electrical construction companies associated with London, United Kingdom as of October 2026 and tracks 1,511 professional contacts across them, including 460 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for electrical construction companies associated with London, United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 12, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Oct 12, 2026 How this list was built

327Companies

1,511Contacts tracked

460Verified emails

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

The 22 largest electrical construction companies based in London, United Kingdom

Ranked by team size

Top 22 of 327 company matches for electrical construction companies based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 12, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Grant Walker Engineering	Exact match	London, United KingdomHQ recorded Oct 12, 2026	51-200	87 contacts →
	Exact match “Grant Walker Engineering specialise in the complete installation of Electrical and Mechanical systems across all work sectors including quality office developments, commercial and…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
2	Phoenix ME	Exact match	London, United KingdomHQ recorded Oct 12, 2026	501-1,000	47 contacts →
	Exact match “We stand as a well-established industry leader, specialising in the design, installation, and commissioning of mechanical and electrical systems across diverse sectors.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
3	Redworx MEP	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	41 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
4	Hanover Building Services	Exact match	London, United KingdomHQ recorded Oct 12, 2026	51-200	34 contacts →
	Exact match “Hanover is an award-winning building services provider that specialises in electrical, mechanical, plumbing, heating and renewable energy installations.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
5	VHL Mechanical	Exact match	London, United KingdomHQ recorded Oct 12, 2026	51-200	32 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
6	ARC Electrical	Exact match	London, United KingdomHQ recorded Oct 12, 2026	1-10	29 contacts →
	Exact match “Electrical Contractors and Wholesalers based in Central London and Essex.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
7	Leonari LTD	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	27 contacts →
	Exact match “Established in 2014, Leonari is a Mechanical & Electrical contractor working in London and the South East.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
8	Eltrade Electrical LTD	Exact match	London, United KingdomHQ recorded Oct 12, 2026	1-10	27 contacts →
	Exact match “ELTRADE ELECTRICAL LTD is a civil engineering company” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
9	Niblock Electrical Services	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	21 contacts →
	Exact match “Niblock Electrical Services are a M&E contractor based in South East London.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
10	Dennis Johns Service Group	Exact match	London, United KingdomHQ recorded Oct 12, 2026	51-200	20 contacts →
	Exact match “The Dennis Johns Service Group is a forward thinking group of companies providing, Electrical, CCTV and Access Control, installation and maintenance contracting services.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
11	LOS Electrical	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	15 contacts →
	Exact match “LOS Electrical Engineers is a specialist electrical contractor delivering high-quality electrical engineering solutions across the water and industrial sectors.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
12	SI Electrical LTD	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	15 contacts →
	Exact match “SI Electrical provide complete electrical solutions and are renowned for our expertise in lighting and controls.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
13	GPM London LTD	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	15 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
14	Cole Group	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	14 contacts →
	Exact match “At COLE Group, we specialize in delivering outstanding electrical solutions for both new build and refurbishment projects.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
15	Switched On London LTD	Exact match	London, United KingdomHQ recorded Oct 12, 2026	1-10	13 contacts →
	Exact match “Plumbing, Gas and Electrical contractors based in Earlsfield, SW18.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
16	Rederic LTD	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	13 contacts →
	Exact match “Here at Rederic, we leverage our wealth of industry knowledge and expertise to provide efficient, personalised solutions for all mechanical & electrical, audiovisual, data…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
17	London Electrical Solutions LTD	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	11 contacts →
	Exact match “London Electrical Solutions: Experienced Electricians operating across London Residential & Commercial Electricians serving Greater London London Electrical Solutions is a…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
18	Concepto Solutions LTD	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	11 contacts →
	Exact match “Concepto AV is an electrical-led technology company delivering high-quality electrical installations across residential and commercial projects in London.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
19	Zeus Electrical Constructions	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	11 contacts →
	Exact match “ZEUS is engaged in studies and electrical installations.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
20	TNS Electrical Contractors LTD	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	10 contacts →
	Exact match “We are TNS Electrical Contractors Ltd and based in East London with over 15 years of experience in the electrical industry.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
21	NES Security Limited	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	9 contacts →
	Exact match “An independent electrical services company providing bespoke and high-quality CCTV, Security, Access control and Automation technology systems to private and corporate clients in…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
22	JSJ Smart Homes	Exact match	London, United KingdomHQ recorded Oct 12, 2026	1-10	9 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “electrical construction companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 22 of 327 electrical construction companies based in London, United Kingdom

See the full list, filter by size, metro and specialty, and access 460 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Electrical construction companies based in London, United Kingdom at a glance

As of Oct 12, 2026

30.4%Verified-email coverage

4.6Average contacts per company

1-10Median size (employees)

Oct 12, 2026Page data refreshed

Companies by employee count

1-10

206

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 327 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with London, United Kingdom whose business descriptions match “electrical construction companies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 460 professional contacts with verified work emails across the full matched dataset. 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 October 12, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Electrical construction companies by metro in the United Kingdom

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “electrical construction companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many electrical construction companies are there based in London, United Kingdom?

RevenueBase identified 327 company matches for electrical construction companies associated with London, United Kingdom as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Grant Walker Engineering tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United Kingdom has the most electrical construction companies?

London leads the United Kingdom with 327 company records, followed by Manchester (67) and Bristol (63).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 460 professional contacts with verified work emails tracked across these 327 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 12, 2026.

Ready to reach these companies? Verified emails and direct dials for all 327 electrical construction companies based in London, United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Electrical construction companies 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 SmartSearch, 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.