Company lists · Data refreshed September 2026

Top 25 Mechanical systems integrators based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 100 companies tracked

RevenueBase identified 100 mechanical systems integrators headquartered in London, United Kingdom as of September 2026 and tracks 1,512 professional contacts across them, including 612 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers mechanical systems integrators 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 28, 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 28, 2026 86% judged on-target in blind review

100Companies

1,512Contacts tracked

612Verified emails

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The 25 largest mechanical systems integrators based in London, United Kingdom

Ranked by team size

Top 25 of 100 mechanical systems integrators based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to mechanical systems integrators: 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	Beck & Pollitzer	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	443 contacts →
	Indirect evidence “Beck & Pollitzer is the world’s leading provider of complex engineering solutions, including industrial installation and relocation services.” Source: RevenueBase Database · checked Sep 28, 2026
2	Gratte Brothers Group	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	501-1,000	270 contacts →
	Indirect evidence “Gratte Brothers Group is a leading independent provider of comprehensive building services, renowned for exceptional quality.” Source: RevenueBase Database · checked Sep 28, 2026
3	Grant Walker Engineering	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	81 contacts →
	Strong 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 28, 2026
4	Link Media Systems	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	37 contacts →
	Strong evidence “We are systems integrators.” Source: RevenueBase Database · checked Sep 28, 2026
5	Okto Technologies	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	32 contacts →
	Strong evidence “Master Systems Integrator OKTO Technologies is a leader in the design, development & installation of Smart Building Technology for- SuperPrime Residential - Luxury Hospitality -…” Source: RevenueBase Database · checked Sep 28, 2026
6	Torpedo Factory Group	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	27 contacts →
	Strong evidence “AMAZING DIGITAL EXPERIENCES THAT WOW BY DESIGN Torpedo Factory Group is a Master Systems Integrator providing professional services for Intelligent Environments & Smart Buildings…” Source: RevenueBase Database · checked Sep 28, 2026
7	Condition Environment Services Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	26 contacts →
	Partial evidence “At Condition Environment Services Limited, we lead the way in mechanical building services.” Source: RevenueBase Database · checked Sep 28, 2026
8	Pipewize LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	23 contacts →
	Partial evidence “PipeWize Ltd is a specialist mechanical engineering contractor headquartered in London, delivering complex, high-integrity projects across the UK and internationally.” Source: RevenueBase Database · checked Sep 28, 2026
9	S&g Hvac Mechanical Specialists	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	13 contacts →
	Partial evidence “S&G are a Mechanical Contractor with offices in London, Wales and the Midlands.” Source: RevenueBase Database · checked Sep 28, 2026
10	BTP Consultants	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	12 contacts →
	Strong evidence “We design mechanical and electrical systems, advise on all aspects of energy, carbon reduction and building physics.” Source: RevenueBase Database · checked Sep 28, 2026
11	GPM London LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
12	Intellicasa	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	11 contacts →
	Partial evidence “We are an award-winning, SafeContractor approved company specialised in SMART automation technologies and entertainment systems for the residential and commercial sectors.” Source: RevenueBase Database · checked Sep 28, 2026
13	WB Shiels	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	9 contacts →
	Indirect evidence “Building services engineers are rarely renowned for their creative flair.” Source: RevenueBase Database · checked Sep 28, 2026
14	Celsius Solutions LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	9 contacts →
	Indirect evidence “Celsius Solutions Ltd delivers projects throughout London, the South East and the UK with our unequalled Design and Build service for the HVAC sector.” Source: RevenueBase Database · checked Sep 28, 2026
15	Atmosair Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	6 contacts →
	Partial evidence “Providing our Clients with every aspect of Mechanical services from design concept to completion on time with professionalism.” Source: RevenueBase Database · checked Sep 28, 2026
16	TH Electrical & Mechanical LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	6 contacts →
	Partial evidence “TH ELECTRICAL & MECHANICAL LTD is a construction company based in London and operating throughout London and the South East, delivering the full range of mechanical, electrical &…” Source: RevenueBase Database · checked Sep 28, 2026
17	Harrison HOW LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
18	Intes UK	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	5 contacts →
	Strong evidence “London based security systems integrator presently engaged on some of the most existing London landmark buildings.” Source: RevenueBase Database · checked Sep 28, 2026
19	Mechanical Contracts LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	5 contacts →
	Partial evidence “Welcome to Mechanical Contracts Ltd, your trusted partner in comprehensive mechanical solutions.” Source: RevenueBase Database · checked Sep 28, 2026
20	J&m Services Group	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	5 contacts →
	Partial evidence “At J&M Mechanical Services, we specialise in providing expert mechanical solutions for commercial and industrial clients.” Source: RevenueBase Database · checked Sep 28, 2026
21	Racsel Building Services LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	5 contacts →
	Indirect 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 28, 2026
22	4 Mech	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	4 contacts →
	Strong evidence “4MECH Specialise in the complete install of all Mechanical Pipework Systems across a variety of work sectors, Including Commercial, Industrial, Data Centres, Education, Health…” Source: RevenueBase Database · checked Sep 28, 2026
23	Tenways	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	4 contacts →
	Indirect evidence “Tenways Engineering provides Installation and control solutions for HVAC.” Source: RevenueBase Database · checked Sep 28, 2026
24	Network Bridge Solutions LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	4 contacts →
	Indirect evidence “Network Bridge Solutions works with manufacturers where IT and operational technology have grown apart, and where that gap has become a liability.” Source: RevenueBase Database · checked Sep 28, 2026
25	Hoveair Maintenance Services Limited	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	4 contacts →
	Indirect 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 28, 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: mechanical systems integrators. 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 mechanical systems integrators.
Partial evidence: Its own public description names part of mechanical systems integrators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name mechanical systems integrators. 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 100 mechanical systems integrators based in London, United Kingdom

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Mechanical systems integrators based in London, United Kingdom at a glance

As of Sep 28, 2026

40.5%Verified-email coverage

15.1Average contacts per company

11-50Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

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 100 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 mechanical systems integrators, 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 “mechanical systems integrators”. 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 mechanical systems integrators), 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 mechanical systems integrators, 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, 612 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 28, 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.

Mechanical systems integrators by metro in the United Kingdom

Mechanical systems integrators in Birmingham25

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 mechanical systems integrators, 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 mechanical systems integrators are there based in London, United Kingdom?

RevenueBase identified 100 mechanical systems integrators 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?

Beck & Pollitzer, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most mechanical systems integrators?

London leads the United Kingdom with 100 headquartered companies, followed by Birmingham (25) and Manchester (24).

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 612 verified decision-maker contacts tracked across these 100 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 28, 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.