Company lists · Data refreshed September 2026

Top 25 Equipment installation contractors based in London, United Kingdom

Name: Equipment installation 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 136 companies tracked

RevenueBase identified 136 equipment installation contractors headquartered in London, United Kingdom as of September 2026 and tracks 833 professional contacts across them, including 247 with verified work emails. London is the largest hub.

This list covers equipment installation 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

136Companies

833Contacts tracked

247Verified emails

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The 25 largest equipment installation contractors based in London, United Kingdom

Ranked by team size

Top 25 of 136 equipment installation 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 equipment installation 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	Elmech LTD	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	42 contacts →
	Indirect evidence “The core activities of our business are all aspects of mechanical and electrical services including air conditioning, sprinkler systems, CHW<HW, ventilation, BMS, door entry and…” Source: RevenueBase Database · checked Sep 16, 2026
3	Redworx MEP Limited	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	37 contacts →
	Partial 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
4	ECS Systems LTD	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	35 contacts →
	Indirect evidence “Here at ECS Systems we pride ourselves on providing the highest level of personalised service, to every client.” Source: RevenueBase Database · checked Sep 16, 2026
5	Phoenix ME	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	33 contacts →
	Partial evidence “We stand as a well-established industry leader, specialising in the design, installation, and commissioning of mechanical and electrical systems across diverse sectors.” Source: RevenueBase Database · checked Sep 16, 2026
6	ARC Electrical	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	30 contacts →
	Partial evidence “Electrical Contractors and Wholesalers based in Central London and Essex.” Source: RevenueBase Database · checked Sep 16, 2026
7	Leonari LTD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	25 contacts →
	Partial evidence “Established in 2014, Leonari is a Mechanical & Electrical contractor working in London and the South East.” Source: RevenueBase Database · checked Sep 16, 2026
8	Axiom Projects LTD	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	14 contacts →
	Indirect evidence “Our core offerings are split into three main business streams, Mechanical, Electrical & Fit-out.” Source: RevenueBase Database · checked Sep 16, 2026
9	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
10	Rederic LTD	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	12 contacts →
	Indirect evidence “Here at Rederic, we leverage our wealth of industry knowledge and expertise to provide efficient, personalised solutions for all mechanical & electrical, audiovisual, data…” Source: RevenueBase Database · checked Sep 16, 2026
11	SPL Construct LTD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	12 contacts →
	Partial 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
12	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
13	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
14	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
15	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
16	Atmosair Limited	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	6 contacts →
	Indirect evidence “Providing our Clients with every aspect of Mechanical services from design concept to completion on time with professionalism.” Source: RevenueBase Database · checked Sep 16, 2026
17	Associated Cooling Services Limited	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	6 contacts →
	Partial evidence “ACS were formed in 1991 to specialise in the installation and maintenance of Air Conditioning and Ventilation Systems.” Source: RevenueBase Database · checked Sep 16, 2026
18	Harrison HOW LTD	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	6 contacts →
	Indirect evidence “Harrison How Limited are situated in the heart of London and have been serving clients since 1939.” Source: RevenueBase Database · checked Sep 16, 2026
19	Astoria Fire And Security	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	5 contacts →
	Partial evidence “Astoria Fire and Security carry out installations and provide maintenance services in the Electrical, Fire Alarm and CCTV industry to commercial, industrial and domestic…” Source: RevenueBase Database · checked Sep 16, 2026
20	J&m Services Group	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	5 contacts →
	Indirect evidence “At J&M Mechanical Services, we specialise in providing expert mechanical solutions for commercial and industrial clients.” Source: RevenueBase Database · checked Sep 16, 2026
21	Racsel Building Services LTD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	5 contacts →
	Partial evidence “With over 50 years’ experience within the industry Racsel Building Services Limited specialize in Design, Installation, Maintenance and Servicing of heating, ventilation, cooling…” Source: RevenueBase Database · checked Sep 16, 2026
22	SES Electrical Contractors UK LTD	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	5 contacts →
	Indirect evidence “Fire Safety & Electrical Compliance for London Buildings SES designs, installs, tests and maintains fire alarm, emergency lighting and life-safety systems, alongside electrical…” Source: RevenueBase Database · checked Sep 16, 2026
23	Hoveair Maintenance Services Limited	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	4 contacts →
	Partial evidence “Hoveair are specialists in all disciplines of the Air Conditioning, Heating and Ventilation and Industry, giving comprehensive Design, Management, Installation, Commissioning and…” Source: RevenueBase Database · checked Sep 16, 2026
24	Franklynair Limited	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	4 contacts →
	Partial evidence “Franklyn Air are specialists in the maintenance and installation of air conditioning across London homes and businesses as well as specialising in the installation and maintenance…” Source: RevenueBase Database · checked Sep 16, 2026
25	Aircond LTD	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	4 contacts →
	Indirect evidence “Air Cond Ltd.” 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: equipment installation 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 equipment installation contractors.
Partial evidence: Its own public description names part of equipment installation contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name equipment installation 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 136 equipment installation contractors based in London, United Kingdom

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Equipment installation contractors based in London, United Kingdom at a glance

As of Sep 16, 2026

29.7%Verified-email coverage

6.1Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

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 136 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 equipment installation 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 “equipment installation 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 equipment installation 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 equipment installation 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, 247 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.

Equipment installation contractors by metro in the United Kingdom

Equipment installation contractors in London136
Equipment installation contractors in Manchester30
Equipment installation contractors in Bristol26

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 equipment installation 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 equipment installation contractors are there based in London, United Kingdom?

RevenueBase identified 136 equipment installation 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 equipment installation contractors?

London leads with 136 headquartered companies, followed by Manchester (30) and Bristol (26).

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 247 verified decision-maker contacts tracked across these 136 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.