Company lists · Data refreshed September 2026

Top 25 Insulation and air sealing companies based in the United Kingdom

Name: Insulation and air sealing companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 489 companies tracked

RevenueBase identified 489 insulation and air sealing companies headquartered in the United Kingdom as of September 2026 and tracks 3,582 professional contacts across them, including 1,425 with verified work emails. London is the largest hub.

This list covers insulation and air sealing companies 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 20, 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 20, 2026 86% judged on-target in blind review

489Companies

3,582Contacts tracked

1,425Verified emails

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The 25 largest insulation and air sealing companies based in the United Kingdom

Ranked by team size

Top 25 of 489 insulation and air sealing companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to insulation and air sealing companies: 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	Instagroup LTD	Indirect evidence	Finchampstead, United KingdomHQ checked Sep 20, 2026	51-200	104 contacts →
	Indirect evidence “Established in 1980, InstaGroup are a UK leader in the energy efficiency industry, covering commercial and residential projects.” Source: RevenueBase Database · checked Sep 20, 2026
2	A&m Insulations A&m Energy Solutions	Partial evidence	Rainford, United KingdomHQ checked Sep 20, 2026	51-200	70 contacts →
	Partial evidence “We are one of the UK's largest providers of insulation services.” Source: RevenueBase Database · checked Sep 20, 2026
3	Scis Group	Indirect evidence	Fareham, United KingdomHQ checked Sep 20, 2026	51-200	60 contacts →
	Indirect evidence “Hello.” Source: RevenueBase Database · checked Sep 20, 2026
4	MAX Energy LTD	Partial evidence	Leicester, United KingdomHQ checked Sep 20, 2026	201-500	53 contacts →
	Partial evidence “Max Energy Ltd is a UK based new build construction company specialising in the sale of insulation to the new build housing sector on a supply and install basis.” Source: RevenueBase Database · checked Sep 20, 2026
5	RGM Group	Strong evidence	Ballyclare, United KingdomHQ checked Sep 20, 2026	51-200	49 contacts →
	Strong evidence “RGM Group offers certified and accredited Ductwork, Fire & Smoke, Air Conditioning and Insulation solutions across the UK and Ireland.” Source: RevenueBase Database · checked Sep 20, 2026
6	Essex Thermal Services LTD	Strong evidence	Dartford, United KingdomHQ checked Sep 20, 2026	51-200	47 contacts →
	Strong evidence “Essex Thermal Services Ltd are a UK based company specialising in Thermal Insulation, Trace Heating, Ventilation and Air Conditioning Installs.” Source: RevenueBase Database · checked Sep 20, 2026
7	Sureserve Energy Services North	Partial evidence	Brighouse, United KingdomHQ checked Sep 20, 2026	1,001-5,000	43 contacts →
	Partial evidence “Sureserve Energy Services North is a leading national installer of insulation, heating solutions and renewable technologies.” Source: RevenueBase Database · checked Sep 20, 2026
8	The Installation Assurance Authority The IAA	Indirect evidence	Leighton Buzzard, United KingdomHQ checked Sep 20, 2026	51-200	42 contacts →
	Indirect evidence “The Installation Assurance Authority (IAA) is the industry body that provides a quality assurance framework covering consumer protection, technical guidance, Certification…” Source: RevenueBase Database · checked Sep 20, 2026
9	Avonside Energy	Partial evidence	Rearsby, United KingdomHQ checked Sep 20, 2026	201-500	42 contacts →
	Partial evidence “Avonside Energy: Your Partner in Sustainable Building Solutions At Avonside Energy, we are dedicated to delivering best-in-class services across: New Build Insulation…” Source: RevenueBase Database · checked Sep 20, 2026
10	Kingspan Technical Insulation LTD	Partial evidence	Basildon, United KingdomHQ checked Sep 20, 2026	51-200	40 contacts →
	Partial evidence “We manufacture high performance insulation products for pipework and ductwork in building services / HVAC, process, petrochemical and refrigeration services applications.” Source: RevenueBase Database · checked Sep 20, 2026
11	Homelogic	Indirect evidence	Southampton, United KingdomHQ checked Sep 20, 2026	51-200	38 contacts →
	Indirect evidence “Homelogic®, based in Southampton, Hampshire, are an innovative, forward-thinking company dedicated to bringing eco-friendly, cost effective energy saving solutions to the homes…” Source: RevenueBase Database · checked Sep 20, 2026
12	Effisus	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	36 contacts →
	Indirect evidence “Effisus is a leading provider of innovative solutions that seamlessly blend Efficiency and Sustainability, delivering integrated systems with superior quality and high added value.” Source: RevenueBase Database · checked Sep 20, 2026
13	Q-Bot LTD	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	32 contacts →
	Indirect evidence “Q-Bot transforms cold, draughty floor voids into warm, efficient and healthier spaces.” Source: RevenueBase Database · checked Sep 20, 2026
14	Actis Insulation	Partial evidence	Chippenham, United KingdomHQ checked Sep 20, 2026	11-50	28 contacts →
	Partial evidence “ACTIS is an innovative European insulation specialist whose vision is to develop effective and environmentally friendly ways of reducing energy consumption.” Source: RevenueBase Database · checked Sep 20, 2026
15	ECO 247	Indirect evidence	St Asaph, United KingdomHQ checked Sep 20, 2026	51-200	25 contacts →
	Indirect evidence “At Eco 247, we are committed to building a greener future through sustainable energy solutions.” Source: RevenueBase Database · checked Sep 20, 2026
16	Green Improve	Partial evidence	Blackburn, United KingdomHQ checked Sep 20, 2026	11-50	24 contacts →
	Partial evidence “At Green Improve, we specialise in providing solutions for renewable heating and insulation installations.” Source: RevenueBase Database · checked Sep 20, 2026
17	Sealprem	Indirect evidence	Scunthorpe, United KingdomHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “Premier Sealant Systems Ltd.” Source: RevenueBase Database · checked Sep 20, 2026
18	ECO Systems Group LTD	Strong evidence	Harold Wood, United KingdomHQ checked Sep 20, 2026	51-200	18 contacts →
	Strong evidence “Eco Systems Group has been delivering high-quality insulation, retrofit, solar solutions & air source heat pumps across the commercial and residential sectors for over 13 years.” Source: RevenueBase Database · checked Sep 20, 2026
19	Jones Weatherproofing	Indirect evidence	Walsall, United KingdomHQ checked Sep 20, 2026	51-200	17 contacts →
	Indirect evidence “The globally trusted partner for weatherproofing solutions in construction.” Source: RevenueBase Database · checked Sep 20, 2026
20	Skyform Group	Partial evidence	Glasgow, United KingdomHQ checked Sep 20, 2026	51-200	17 contacts →
	Partial evidence “Skyform Group is a multi-disciplined company providing access, construction, insulation and energy efficiency solutions throughout the UK to various market sectors.” Source: RevenueBase Database · checked Sep 20, 2026
21	Ecogiants	Indirect evidence	Clitheroe, United KingdomHQ checked Sep 20, 2026	11-50	16 contacts →
	Indirect evidence “EcoGiants is a leading UK-based sustainable building retrofit specialist, delivering large-scale energy efficiency solutions for commercial and residential properties.” Source: RevenueBase Database · checked Sep 20, 2026
22	City Fire Proofing	Indirect evidence	Brentwood, United KingdomHQ checked Sep 20, 2026	51-200	15 contacts →
	Indirect evidence “City Fire Proofing provide solutions from single fire stop seals, to building wide systems, remedial works and surveys.” Source: RevenueBase Database · checked Sep 20, 2026
23	Novora Building Services	Indirect evidence	Wakefield, United KingdomHQ checked Sep 20, 2026	51-200	15 contacts →
	Indirect evidence “Novora Building Services provides a dedicated national service across the UK from a regional branch network centrally controlled from our head office in Yorkshire.” Source: RevenueBase Database · checked Sep 20, 2026
24	URP Group LTD	Indirect evidence	Sheffield, United KingdomHQ checked Sep 20, 2026	11-50	14 contacts →
	Indirect evidence “We are Urban Renewable Power (URP), experts in providing energy efficiency measures.” Source: RevenueBase Database · checked Sep 20, 2026
25	AIM	Partial evidence	Crawley, United KingdomHQ checked Sep 20, 2026	51-200	14 contacts →
	Partial evidence “Established in 1989 as an insulation converter.” Source: RevenueBase Database · checked Sep 20, 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: insulation and air sealing companies. 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 insulation and air sealing companies.
Partial evidence: Its own public description names part of insulation and air sealing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name insulation and air sealing companies. 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 489 insulation and air sealing companies based in the United Kingdom

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Insulation and air sealing companies based in the United Kingdom at a glance

As of Sep 20, 2026

39.8%Verified-email coverage

7.3Average contacts per company

1-10Median size (employees)

7.0%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

243

11-50

185

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 489 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 insulation and air sealing companies, 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 “insulation and air sealing companies”. 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 insulation and air sealing companies), 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 insulation and air sealing companies, 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, 1,425 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 20, 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.

Insulation and air sealing companies by metro

Insulation and air sealing companies in London34

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 insulation and air sealing companies, 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 insulation and air sealing companies are there based in the United Kingdom?

RevenueBase identified 489 insulation and air sealing companies 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?

Instagroup LTD, headquartered in Finchampstead, tops this list with the largest team on record.

Which city has the most insulation and air sealing companies?

London leads with 34 headquartered companies, followed by Manchester (12) and Glasgow (10).

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 1,425 verified decision-maker contacts tracked across these 489 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 20, 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.