Company lists · Data refreshed September 2026

Top 25 Ventilation system contractors based in the United Kingdom

Name: Ventilation system contractors based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 857 companies tracked

RevenueBase identified 857 ventilation system contractors headquartered in the United Kingdom as of September 2026 and tracks 6,857 professional contacts across them, including 2,560 with verified work emails. London is the largest hub.

This list covers ventilation system contractors headquartered in the 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 19, 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 19, 2026 86% judged on-target in blind review

857Companies

6,857Contacts tracked

2,560Verified emails

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The 25 largest ventilation system contractors based in the United Kingdom

Ranked by team size

Top 25 of 857 ventilation system contractors based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to ventilation system 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	Colt International	Indirect evidence	Petersfield, United KingdomHQ checked Sep 19, 2026	1,001-5,000	505 contacts →
	Indirect evidence “Since 1931 we have been harnessing the natural elements to provide healthy, comfortable and safe working and living conditions in buildings.” Source: RevenueBase Database · checked Sep 19, 2026
2	Space Engineering Services LTD	Partial evidence	Bristol, United KingdomHQ checked Sep 19, 2026	201-500	312 contacts →
	Partial evidence “Space Engineering Services is the UK’s leading provider of refrigeration, heating, ventilation and air conditioning services.” Source: RevenueBase Database · checked Sep 19, 2026
3	Envirovent	Strong evidence	Harrogate, United KingdomHQ checked Sep 19, 2026	201-500	200 contacts →
	Strong evidence “envirovent is the leading manufacturer and supplier of ventilation systems.” Source: RevenueBase Database · checked Sep 19, 2026
4	VES	Partial evidence	Eastleigh, United KingdomHQ checked Sep 19, 2026	201-500	167 contacts →
	Partial evidence “For over 55 years, VES has been at the heart of British manufacturing, delivering intelligent ventilation solutions that keep buildings running efficiently.” Source: RevenueBase Database · checked Sep 19, 2026
5	Vent-Axia	Partial evidence	Crawley, United KingdomHQ checked Sep 19, 2026	201-500	153 contacts →
	Partial evidence “Established in 1936 when Joe Akester invented the world’s first electrically-operated window fan, Vent-Axia has been setting the standard for ventilation for over 85 years.” Source: RevenueBase Database · checked Sep 19, 2026
6	SE Controls	Strong evidence	Lichfield, United KingdomHQ checked Sep 19, 2026	51-200	136 contacts →
	Strong evidence “SE Controls is a leading international specialist in the design and delivery of intelligent smoke and environmental ventilation systems using façade automation as an integral part…” Source: RevenueBase Database · checked Sep 19, 2026
7	ELTA	Indirect evidence	Fareham, United KingdomHQ checked Sep 19, 2026	51-200	124 contacts →
	Indirect evidence “For over 50 years, Elta has been a leader in fan design and engineering, offering a diverse range of products for various applications.” Source: RevenueBase Database · checked Sep 19, 2026
8	Hotchkiss LTD	Strong evidence	Eastbourne, United KingdomHQ checked Sep 19, 2026	201-500	107 contacts →
	Strong evidence “Hotchkiss is the UK's leading air conditioning and ventilation contractor.” Source: RevenueBase Database · checked Sep 19, 2026
9	Gilberts Blackpool LTD	Strong evidence	Blackpool, United KingdomHQ checked Sep 19, 2026	201-500	77 contacts →
	Strong evidence “Established in 1960, Gilberts is the UK’s leading designer and manufacturer of grilles, diffusers, louvres, smoke/fire dampers, and natural ventilation systems for the heating…” Source: RevenueBase Database · checked Sep 19, 2026
10	Greenmill AIR Conditioning And Ventilation	Partial evidence	Colchester, United KingdomHQ checked Sep 19, 2026	51-200	65 contacts →
	Partial evidence “Greenmill is one of the UK's leading wholesalers of Air Conditioning and Ventilation Install products.” Source: RevenueBase Database · checked Sep 19, 2026
11	Chapman Ventilation Limited	Partial evidence	Welwyn Garden City, United KingdomHQ checked Sep 19, 2026	51-200	65 contacts →
	Partial evidence “Restaurant ventilation for the likes of Nando's, Five Guys and The Ivy.” Source: RevenueBase Database · checked Sep 19, 2026
12	Vent Engineering	Strong evidence	Poole, United KingdomHQ checked Sep 19, 2026	51-200	60 contacts →
	Strong evidence “Vent Engineering are a specialist in natural and smoke ventilation systems and have been manufacturing, supplying, installing and commissioning ventilation systems since 1988 for…” Source: RevenueBase Database · checked Sep 19, 2026
13	AIR Technology Systems	Strong evidence	Bromsgrove, United KingdomHQ checked Sep 19, 2026	51-200	57 contacts →
	Strong evidence “Air Technology Systems Ltd (ATS) are design and project management specialist contractors focused on providing proprietary and energy saving, Climate Control & Ventilation…” Source: RevenueBase Database · checked Sep 19, 2026
14	The FDS Group	Strong evidence	Dartford, United KingdomHQ checked Sep 19, 2026	51-200	54 contacts →
	Strong evidence “We are experts in providing consultative fire engineering services and smoke ventilation systems for contractors, architects, consultants and developers.” Source: RevenueBase Database · checked Sep 19, 2026
15	Systemair UK	Partial evidence	Birmingham, United KingdomHQ checked Sep 19, 2026	51-200	54 contacts →
	Partial evidence “With our Head Office in Birmingham and a further 13 branches across the UK, we are ideally placed to offer our customers a fast efficient response to any enquiry for Ventilation &…” Source: RevenueBase Database · checked Sep 19, 2026
16	BTU Installation & Maintenance LTD	Indirect evidence	Guildford, United KingdomHQ checked Sep 19, 2026	51-200	53 contacts →
	Indirect evidence “BTU (Installation and Maintenance) Ltd, is a privately owned business based in Guildford, Surrey.” Source: RevenueBase Database · checked Sep 19, 2026
17	Imperial Ductwork Services LTD	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	45 contacts →
	Indirect evidence “From its foundation in 1997, Imperial Ductwork Services Ltd (IDSL) has grown into one of the industry’s leading companies in the Manufacture and Installation of Ductwork…” Source: RevenueBase Database · checked Sep 19, 2026
18	Brookvent	Partial evidence	Belfast, United KingdomHQ checked Sep 19, 2026	51-200	40 contacts →
	Partial evidence “Founded in 1984 by the visionary engineer Billy Divers, Brookvent has established itself as a trailblazer in the ventilation industry.” Source: RevenueBase Database · checked Sep 19, 2026
19	AIR Plants Dust Extraction LTD	Strong evidence	Leicester, United KingdomHQ checked Sep 19, 2026	51-200	39 contacts →
	Strong evidence “Air Plants offer the best solution for industries requiring highly efficient dust extraction and dust control ventilation systems on the market.” Source: RevenueBase Database · checked Sep 19, 2026
20	Airtemp AC LTD	Strong evidence	St Leonard's On Sea, United KingdomHQ checked Sep 19, 2026	51-200	36 contacts →
	Strong evidence “We provide the design, manufacture, installation and service of air conditioning and ventilation systems across the UK.” Source: RevenueBase Database · checked Sep 19, 2026
21	Medical AIR Technology	Partial evidence	Manchester, United KingdomHQ checked Sep 19, 2026	51-200	36 contacts →
	Partial evidence “MAT supplies specialist critical ventilation solutions for the NHS, private healthcare providers, and life science facilities such as universities and research establishments.” Source: RevenueBase Database · checked Sep 19, 2026
22	Farmwood M&e Services LTD	Partial evidence	Sittingbourne, United KingdomHQ checked Sep 19, 2026	11-50	34 contacts →
	Partial evidence “Ventilation and M&E company founded in 2002 by Dave Wood; the company has gone from strength to strength in the South-East, specialising in ventilation and air quality with a…” Source: RevenueBase Database · checked Sep 19, 2026
23	Principal Hvac	Strong evidence	Belfast, United KingdomHQ checked Sep 19, 2026	51-200	34 contacts →
	Strong evidence “Principal HVAC are at the leading edge of Heating, Ventilation & Air conditioning systems for commercial and residential property.” Source: RevenueBase Database · checked Sep 19, 2026
24	Quora Group	Partial evidence	North Shields, United KingdomHQ checked Sep 19, 2026	51-200	33 contacts →
	Partial evidence “Professional service supplying, installing and maintaining energy efficient HVAC systems.” Source: RevenueBase Database · checked Sep 19, 2026
25	London Ductwork Services T A RDS	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	33 contacts →
	Indirect evidence “RDS is one of the leading ductwork manufacturer and installation companies in the Capital that has expanded over the years gaining more than 40 years experience in the industry.” Source: RevenueBase Database · checked Sep 19, 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: ventilation system 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 ventilation system contractors.
Partial evidence: Its own public description names part of ventilation system contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name ventilation system 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 857 ventilation system contractors based in the United Kingdom

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Ventilation system contractors based in the United Kingdom at a glance

As of Sep 19, 2026

37.3%Verified-email coverage

8.0Average contacts per company

1-10Median size (employees)

9.1%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

435

11-50

341

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 857 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 ventilation system 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 the United Kingdom whose own description of what they do matches “ventilation system 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 ventilation system 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 ventilation system contractors, and records with no verified work email. Companies headquartered outside United Kingdom 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, 2,560 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 19, 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.

Ventilation system contractors by metro

Ventilation system contractors in London78

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 ventilation system 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 ventilation system contractors are there based in the United Kingdom?

RevenueBase identified 857 ventilation system contractors headquartered in the 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?

Colt International, headquartered in Petersfield, tops this list with the largest team on record.

Which city has the most ventilation system contractors?

London leads with 78 headquartered companies, followed by Birmingham (16) and Manchester (16).

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 2,560 verified decision-maker contacts tracked across these 857 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 19, 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.