Company lists · Data refreshed November 2026

Top 21 Electrical systems integration contractors based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 387 companies tracked

RevenueBase identified 387 company matches for electrical systems integration contractors associated with London, United Kingdom as of November 2026 and tracks 6,131 professional contacts across them, including 1,883 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for electrical systems integration contractors 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 November 6, 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 Nov 6, 2026 How this list was built

387Companies

6,131Contacts tracked

1,883Verified emails

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The 21 largest electrical systems integration contractors based in London, United Kingdom

Ranked by team size

Top 21 of 387 company matches for electrical systems integration contractors based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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	J Brand LTD	Exact match	London, United KingdomHQ recorded Nov 6, 2026	n/a	1,265 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Tclarke	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	652 contacts →
	Exact match “TClarke is an industry leader in the design, installation, integration and maintenance of the digital, mechanical and electrical technologies and infrastructures that a 21st…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Grant Walker Engineering	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	92 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 · Nov 6, 2026 · View company records in RevenueBase
4	Malcolm Building Services Limited	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	49 contacts →
	Exact match “Malcolm Building Services are a London based Mechanical and Electrical contractor specialising in Commercial & residential new build mixed use schemes.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Redworx MEP	Exact match	London, United KingdomHQ recorded Nov 6, 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 · Nov 6, 2026 · View company records in RevenueBase
6	OKTO	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	41 contacts →
	Exact match “For over thirty years, OKTO has designed, built and commissioned the technology inside buildings where failure has consequences.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Link Media Systems	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	38 contacts →
	Exact match “We are systems integrators.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	ECS Systems LTD	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	38 contacts →
	Exact match “Here at ECS Systems we pride ourselves on providing the highest level of personalised service, to every client.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	ARC Electrical	Exact match	London, United KingdomHQ recorded Nov 6, 2026	n/a	31 contacts →
	Exact match “Electrical Contractors and Wholesalers based in Central London and Essex.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Leonari LTD	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	28 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 · Nov 6, 2026 · View company records in RevenueBase
11	The Full Electrical Services Co. LTD	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	26 contacts →
	Exact match “The Full Electrical Services Company Ltd covers a wide range of mechanical and electrical installation activities and have an extensive portfolio of completed projects.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	ONE MEP	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	25 contacts →
	Exact match “At ONE MEP, we deliver professional, reliable, and high-quality MEP solutions across London and surrounding areas.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Interlinked Group	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	23 contacts →
	Exact match “Specialise in Electrical, AV/IT, Wireless Networks, Smart Buildings, Fire & Security in the construction sector, over the UK & Europe.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Niblock Electrical Services	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	23 contacts →
	Exact match “Niblock Electrical Services are a M&E contractor based in South East London.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Dennis Johns Service Group	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	22 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 · Nov 6, 2026 · View company records in RevenueBase
16	Phoenix ME	Exact match	London, United KingdomHQ recorded Nov 6, 2026	501-1,000	18 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 · Nov 6, 2026 · View company records in RevenueBase
17	SI Electrical LTD	Exact match	London, United KingdomHQ recorded Nov 6, 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 · Nov 6, 2026 · View company records in RevenueBase
18	Cole Group	Exact match	London, United KingdomHQ recorded Nov 6, 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 · Nov 6, 2026 · View company records in RevenueBase
19	We ARE BAU Group	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	14 contacts →
	Exact match “Bau group are a privately owned and operated business that has grown substantially since its inception and continues to expand, consolidating its position in all sectors of…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Rederic LTD	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	14 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 · Nov 6, 2026 · View company records in RevenueBase
21	Twentytwo Integration	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	12 contacts →
	Exact match “TwentyTwo Integration are experts in bringing together audio, television, lighting, telephone & communications, data networks, security & other bespoke systems into a unified…” Recorded in the RevenueBase company graph · Nov 6, 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 systems integration contractors”. 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 21 of 387 electrical systems integration contractors based in London, United Kingdom

See the full list, filter by size, metro and specialty, and access 1,883 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Electrical systems integration contractors based in London, United Kingdom at a glance

As of Nov 6, 2026

30.7%Verified-email coverage

15.8Average contacts per company

1-10Median size (employees)

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

224

11-50

115

51-200

201-500

501-1,000

1,001-5,000

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 387 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 systems integration contractors” 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 1,883 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 November 6, 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 systems integration contractors 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 systems integration contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many electrical systems integration contractors are there based in London, United Kingdom?

RevenueBase identified 387 company matches for electrical systems integration contractors associated with London, United Kingdom as of November 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?

J Brand LTD 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 systems integration contractors?

London leads the United Kingdom with 387 company records, followed by Manchester (84) and Nottingham (64).

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 1,883 professional contacts with verified work emails tracked across these 387 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 November 6, 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 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.