Company lists · Data refreshed September 2026

Top 25 Insulated glass unit manufacturers based in the United Kingdom

Name: Insulated glass unit manufacturers based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 655 companies tracked

RevenueBase identified 655 insulated glass unit manufacturers headquartered in the United Kingdom as of September 2026 and tracks 7,455 professional contacts across them, including 1,970 with verified work emails. London is the largest hub.

This list covers insulated glass unit manufacturers 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 17, 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 17, 2026 86% judged on-target in blind review

655Companies

7,455Contacts tracked

1,970Verified emails

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The 25 largest insulated glass unit manufacturers based in the United Kingdom

Ranked by team size

Top 25 of 655 insulated glass unit manufacturers based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to insulated glass unit manufacturers: 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	Pilkington United Kingdom Limited	Partial evidence	Lancashire, United KingdomHQ checked Sep 17, 2026	501-1,000	1,805 contacts →
	Partial evidence “Pilkington United Kingdom Limited, part of the NSG Group, is one of the global leaders in glass and glazing technology.” Source: RevenueBase Database · checked Sep 17, 2026
2	Press Glass UK	Partial evidence	Swansea, United KingdomHQ checked Sep 17, 2026	1,001-5,000	132 contacts →
	Partial evidence “PRESS GLASS WE ARE HERE TO MAKE A DIFFERENCE.” Source: RevenueBase Database · checked Sep 17, 2026
3	Emplas Window Systems	Indirect evidence	Wellingborough, United KingdomHQ checked Sep 17, 2026	201-500	117 contacts →
	Indirect evidence “Emplas is the window and door fabricator of choice, offering a complete range of premium-quality, high-security, energy-efficient windows and doors for the trade installer, new…” Source: RevenueBase Database · checked Sep 17, 2026
4	Careyglass	Partial evidence	Armagh, United KingdomHQ checked Sep 17, 2026	501-1,000	102 contacts →
	Partial evidence “Since 1965, Carey Glass has been pushing the boundaries of what’s possible with glass, from providing safer and more energy efficient windows to contributing to stunning…” Source: RevenueBase Database · checked Sep 17, 2026
5	Aluk GB	Indirect evidence	Chepstow, United KingdomHQ checked Sep 17, 2026	201-500	98 contacts →
	Indirect evidence “For more than 40 years across the world, AluK has been at the forefront of the design of aluminium curtain walling, window and door systems, combining unique and innovative…” Source: RevenueBase Database · checked Sep 17, 2026
6	Clayton Glass	Strong evidence	Stanley, United KingdomHQ checked Sep 17, 2026	501-1,000	94 contacts →
	Strong evidence “Clayton Glass is the UK’s favourite Independent IGU supplier and the UK’s leading Conservatory Roof Glass & Composite Door Glass Manufacturer.” Source: RevenueBase Database · checked Sep 17, 2026
7	KAT UK Macclesfield	Partial evidence	Macclesfield, United KingdomHQ checked Sep 17, 2026	51-200	82 contacts →
	Partial evidence “KAT UK is a Macclesfield based manufacturer of specialist glazing products, including Aluminium and PVCu bifold doors, sliding patio doors, entrance doors, French doors, windows…” Source: RevenueBase Database · checked Sep 17, 2026
8	IQ Glass	Partial evidence	Amersham, United KingdomHQ checked Sep 17, 2026	51-200	73 contacts →
	Partial evidence “IQ Glass is the UK's leader in high specification architectural glazing, supplying and installing the most pioneering architectural glass technology.” Source: RevenueBase Database · checked Sep 17, 2026
9	GG Glass & Glazing LTD	Indirect evidence	Liverpool, United KingdomHQ checked Sep 17, 2026	51-200	72 contacts →
	Indirect evidence “A truly national planned and emergency glazier for commercial customers such as nationwide retailers, local authorities, the leisure industry and small to medium businesses.” Source: RevenueBase Database · checked Sep 17, 2026
10	Schüco UK And Ireland	Indirect evidence	Milton Keynes, United KingdomHQ checked Sep 17, 2026	51-200	71 contacts →
	Indirect evidence “With over 30 years of experience, Schüco UK Ltd is a leading building envelope specialist supplying high-quality system solutions in aluminium and steel for windows, doors…” Source: RevenueBase Database · checked Sep 17, 2026
11	Unique Window Systems LTD	Indirect evidence	Leicester, United KingdomHQ checked Sep 17, 2026	201-500	71 contacts →
	Indirect evidence “An award-winning designer, fabricator and installer of UPVC and aluminium windows, doors and curtain walling, Unique Window Systems Ltd specialises in the supply of quality…” Source: RevenueBase Database · checked Sep 17, 2026
12	Polyframe	Partial evidence	Lenwade, United KingdomHQ checked Sep 17, 2026	201-500	66 contacts →
	Partial evidence “Polyframe are a multi award-winning manufacturer of high quality windows, doors and conservatories.” Source: RevenueBase Database · checked Sep 17, 2026
13	Obex UK	Indirect evidence	Worcester, United KingdomHQ checked Sep 17, 2026	51-200	62 contacts →
	Indirect evidence “OBEX Protection Ltd is a global leader in the supply of innovative sealing and protection solutions for commercial glazing and façades.” Source: RevenueBase Database · checked Sep 17, 2026
14	Senior Architectural Systems	Partial evidence	Doncaster, United KingdomHQ checked Sep 17, 2026	51-200	60 contacts →
	Partial evidence “Senior Architectural Systems (Senior) is one of the UK's leading manufacturers of aluminium fenestration solutions.” Source: RevenueBase Database · checked Sep 17, 2026
15	Britplas	Indirect evidence	Warrington, United KingdomHQ checked Sep 17, 2026	51-200	58 contacts →
	Indirect evidence “Britplas are experts in the design, fabrication and installation of all types of commercial glazing and curtain walling, including Schueco, Kawneer, Aluprof and Smart systems as…” Source: RevenueBase Database · checked Sep 17, 2026
16	JPJ Installations LTD	Indirect evidence	Braintree, United KingdomHQ checked Sep 17, 2026	51-200	57 contacts →
	Indirect evidence “JPJ Installations Ltd are specialists in Aluminium Glazing Systems including Curtain Wall, Framing, Door and Window Systems.” Source: RevenueBase Database · checked Sep 17, 2026
17	Fleetwood Architectural Aluminium LTD	Partial evidence	Slough, United KingdomHQ checked Sep 17, 2026	51-200	56 contacts →
	Partial evidence “Fleetwood Architectural Aluminium (FAA) is one of the UK’s leading designers, manufacturers and installers of aluminium curtain walling, facades, windows and doors.” Source: RevenueBase Database · checked Sep 17, 2026
18	CWG Choices Limited	Indirect evidence	Corby, United KingdomHQ checked Sep 17, 2026	201-500	50 contacts →
	Indirect evidence “CWG Choices Ltd is a double glazing supplier of windows, doors, conservatories and garden studios/offices.” Source: RevenueBase Database · checked Sep 17, 2026
19	Walsin LTD	Indirect evidence	Lisburn, United KingdomHQ checked Sep 17, 2026	51-200	46 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
20	ESG Group	Partial evidence	Witham, United KingdomHQ checked Sep 17, 2026	51-200	46 contacts →
	Partial evidence “ESG is one of the UK’s leading independent glass processors.” Source: RevenueBase Database · checked Sep 17, 2026
21	Granada Glazing	Partial evidence	Sheffield, United KingdomHQ checked Sep 17, 2026	51-200	45 contacts →
	Partial evidence “Granada Glazing is the UK’s leading manufacturer of premium bespoke secondary glazing systems, trusted for over 45 years by architects, developers, contractors and property…” Source: RevenueBase Database · checked Sep 17, 2026
22	Cantifix LTD	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	40 contacts →
	Partial evidence “For 40 years, Cantifix has been pushing the boundaries of structural glazing, delivering bespoke architectural glass solutions for some of the UK's most ambitious residential…” Source: RevenueBase Database · checked Sep 17, 2026
23	Arkay Windows	Indirect evidence	Watford, United KingdomHQ checked Sep 17, 2026	51-200	40 contacts →
	Indirect evidence “Arkay Windows provides a one stop shop high-end glazing solution for commercial & domestic projects.” Source: RevenueBase Database · checked Sep 17, 2026
24	Russell Timber Technology	Partial evidence	Glasgow, United KingdomHQ checked Sep 17, 2026	51-200	39 contacts →
	Partial evidence “For over 55 years, Russell Timber Technology has been the UK’s leading manufacturer of energy efficient, sustainable, precision-engineered Timber and Alu-Clad windows, doors and…” Source: RevenueBase Database · checked Sep 17, 2026
25	Dualseal Glass	Strong evidence	Huddersfield, United KingdomHQ checked Sep 17, 2026	51-200	38 contacts →
	Strong evidence “dualseal began as a family business in 1995, strategically established in Huddersfield to supply the local market with insulating glass units (IGUs)- incorporating the…” Source: RevenueBase Database · checked Sep 17, 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: insulated glass unit manufacturers. 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 insulated glass unit manufacturers.
Partial evidence: Its own public description names part of insulated glass unit manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name insulated glass unit manufacturers. 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 655 insulated glass unit manufacturers based in the United Kingdom

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Insulated glass unit manufacturers based in the United Kingdom at a glance

As of Sep 17, 2026

26.4%Verified-email coverage

11.4Average contacts per company

11-50Median size (employees)

7.9%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

263

11-50

237

51-200

115

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 655 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 insulated glass unit manufacturers, 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 “insulated glass unit manufacturers”. 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 insulated glass unit manufacturers), 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 insulated glass unit manufacturers, 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, 1,970 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 17, 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.

Insulated glass unit manufacturers by metro

Insulated glass unit manufacturers in London52

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 insulated glass unit manufacturers, 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 insulated glass unit manufacturers are there based in the United Kingdom?

RevenueBase identified 655 insulated glass unit manufacturers 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?

Pilkington United Kingdom Limited, headquartered in Lancashire, tops this list with the largest team on record.

Which city has the most insulated glass unit manufacturers?

London leads with 52 headquartered companies, followed by Birmingham (13) and Norwich (9).

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 1,970 verified decision-maker contacts tracked across these 655 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 17, 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.