Company lists · Data refreshed September 2026

Top 25 Energy efficient windows companies based in the United Kingdom

Name: Energy efficient windows 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 16, 2026 263 companies tracked

RevenueBase identified 263 energy efficient windows companies headquartered in the United Kingdom as of September 2026 and tracks 1,953 professional contacts across them, including 570 with verified work emails. London is the largest hub.

This list covers energy efficient windows 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 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

263Companies

1,953Contacts tracked

570Verified emails

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The 25 largest energy efficient windows companies based in the United Kingdom

Ranked by team size

Top 25 of 263 energy efficient windows companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to energy efficient windows 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	Nordan UK LTD	Partial evidence	Livingston, United KingdomHQ checked Sep 16, 2026	51-200	154 contacts →
	Partial evidence “NorDan is one of Europe’s leading manufacturers of high performance windows, doors and smart accessories.” Source: RevenueBase Database · checked Sep 16, 2026
2	Press Glass UK	Indirect evidence	Swansea, United KingdomHQ checked Sep 16, 2026	1,001-5,000	132 contacts →
	Indirect evidence “PRESS GLASS WE ARE HERE TO MAKE A DIFFERENCE.” Source: RevenueBase Database · checked Sep 16, 2026
3	KAT UK Macclesfield	Partial evidence	Macclesfield, United KingdomHQ checked Sep 16, 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 16, 2026
4	Monodraught LTD	Partial evidence	High Wycombe, United KingdomHQ checked Sep 16, 2026	51-200	81 contacts →
	Partial evidence “Monodraught Ltd design and manufacture low carbon, low energy solutions for the Natural Ventilation, Natural Daylight and Natural Cooling markets.” Source: RevenueBase Database · checked Sep 16, 2026
5	Senior Architectural Systems	Indirect evidence	Doncaster, United KingdomHQ checked Sep 16, 2026	51-200	60 contacts →
	Indirect evidence “Senior Architectural Systems (Senior) is one of the UK's leading manufacturers of aluminium fenestration solutions.” Source: RevenueBase Database · checked Sep 16, 2026
6	Munster Joinery U.K	Strong evidence	Warwick, United KingdomHQ checked Sep 16, 2026	1,001-5,000	45 contacts →
	Strong evidence “For 50 years in business, Munster Joinery is now among Europe's largest manufacturers of energy-efficient windows and doors.” Source: RevenueBase Database · checked Sep 16, 2026
7	Russell Timber Technology	Strong evidence	Glasgow, United KingdomHQ checked Sep 16, 2026	51-200	39 contacts →
	Strong 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 16, 2026
8	Dekko Window Systems LTD	Partial evidence	Ashton-under-lyne, United KingdomHQ checked Sep 16, 2026	51-200	36 contacts →
	Partial evidence “DEKKO WINDOW SYSTEMS LIMITED Manufacturers of a wide range of glazing products for professional installation companies.” Source: RevenueBase Database · checked Sep 16, 2026
9	Joedan Windows & Doors	Indirect evidence	Tewkesbury, United KingdomHQ checked Sep 16, 2026	201-500	35 contacts →
	Indirect evidence “At Joedan, we are a family run business with Retail Design Centres across the Midlands and Southern England; to include a Manufacturing Facility and a Commercial Division.” Source: RevenueBase Database · checked Sep 16, 2026
10	Kloeber UK LTD	Partial evidence	Somersham, United KingdomHQ checked Sep 16, 2026	51-200	30 contacts →
	Partial evidence “Kloeber offer high quality doors, windows and advanced glazing products.” Source: RevenueBase Database · checked Sep 16, 2026
11	FABCO	Partial evidence	Climping, United KingdomHQ checked Sep 16, 2026	51-200	29 contacts →
	Partial evidence “Our creativity and technology continue to transform the steel window industry.” Source: RevenueBase Database · checked Sep 16, 2026
12	Everglade Windows LTD	Partial evidence	Greenford, United KingdomHQ checked Sep 16, 2026	51-200	27 contacts →
	Partial evidence “At Everglade Windows, we are devoted to progressive thinking and pushing boundaries.” Source: RevenueBase Database · checked Sep 16, 2026
13	Clydebuilt Windows & Doors	Indirect evidence	Glasgow, United KingdomHQ checked Sep 16, 2026	51-200	24 contacts →
	Indirect evidence “Clydebuilt Group is based in Glasgow with depots in Aberdeen and Elgin, covering all of Scotland.” Source: RevenueBase Database · checked Sep 16, 2026
14	Crystal Units Limited	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	24 contacts →
	Indirect evidence “Crystal Units Limited is a Glass Manufacturing company based out of 100 West Hendon Broadway, London, United Kingdom.” Source: RevenueBase Database · checked Sep 16, 2026
15	Salisbury Glass Centre Limited	Indirect evidence	Fordingbridge, United KingdomHQ checked Sep 16, 2026	11-50	19 contacts →
	Indirect evidence “SALISBURY GLASS CENTRE LIMITED is a company based out of Fordingbridge, Hampshire, United Kingdom.” Source: RevenueBase Database · checked Sep 16, 2026
16	NEW World Developments Limited	Partial evidence	Ballymena, United KingdomHQ checked Sep 16, 2026	201-500	19 contacts →
	Partial evidence “NEW WORLD DEVELOPMENTS LIMITED manufactures a range of window and doors and is based out of Woodside Road Industrial Estate, Ballymena, CO.ANTRIM, United Kingdom.” Source: RevenueBase Database · checked Sep 16, 2026
17	Idsystems	Indirect evidence	Norwich, United KingdomHQ checked Sep 16, 2026	51-200	18 contacts →
	Indirect evidence “For almost 20 years IDSystems has manufactured, supplied and installed some of the most advanced glazing solutions on the market.” Source: RevenueBase Database · checked Sep 16, 2026
18	Exterior Plas	Indirect evidence	Loughton, United KingdomHQ checked Sep 16, 2026	11-50	17 contacts →
	Indirect evidence “Exterior Plas Limited is a construction company based out of Old Station Rd, Loughton, United Kingdom.” Source: RevenueBase Database · checked Sep 16, 2026
19	Windowworx	Partial evidence	Reading, United KingdomHQ checked Sep 16, 2026	11-50	17 contacts →
	Partial evidence “WindowWorx \| Premium Aluminium Doors & Windows At WindowWorx we design, supply and install premium aluminium doors, windows and glazing systems for homes and commercial projects…” Source: RevenueBase Database · checked Sep 16, 2026
20	3d Aluminium	Partial evidence	Eynsham, United KingdomHQ checked Sep 16, 2026	11-50	15 contacts →
	Partial evidence “With over 53 years experience 3D Aluminium is one of the leading players in the commercial and public sectors, offering a range of technically advanced window, door and curtain…” Source: RevenueBase Database · checked Sep 16, 2026
21	Pacegrade Limited	Indirect evidence	Stourbridge, United KingdomHQ checked Sep 16, 2026	1-10	13 contacts →
	Indirect evidence “We pride ourselves on the ability to translate design intent into a fully developed and detailed design, with all of our projects created to suit individual needs.” Source: RevenueBase Database · checked Sep 16, 2026
22	Evolution Windows & Doors	Partial evidence	Biggleswade, United KingdomHQ checked Sep 16, 2026	51-200	13 contacts →
	Partial evidence “Evolution has created a unique position within the world of windows and doors.” Source: RevenueBase Database · checked Sep 16, 2026
23	Ecohaus Windows & Doors	Indirect evidence	Stroud, United KingdomHQ checked Sep 16, 2026	11-50	10 contacts →
	Indirect evidence “Distinctive by DESIGN.” Source: RevenueBase Database · checked Sep 16, 2026
24	Festa System UK	Indirect evidence	Huddersfield, United KingdomHQ checked Sep 16, 2026	1-10	10 contacts →
	Indirect evidence “Here at Festa, we love to combine latest technology with fresh designing trends to provide intelligent aluminium solutions for your home or business building.” Source: RevenueBase Database · checked Sep 16, 2026
25	Veranti Limited	Indirect evidence	Waterlooville, United KingdomHQ checked Sep 16, 2026	11-50	10 contacts →
	Indirect evidence “Veranti Limited specialise in the design, manufacture and installation of high quality and high performance building envelopes, including aluminium and composite curtain walling…” 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: energy efficient windows 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 energy efficient windows companies.
Partial evidence: Its own public description names part of energy efficient windows companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy efficient windows 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 263 energy efficient windows companies based in the United Kingdom

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Energy efficient windows companies based in the United Kingdom at a glance

As of Sep 16, 2026

29.2%Verified-email coverage

7.4Average contacts per company

11-50Median size (employees)

6.5%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

115

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 263 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 energy efficient windows 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 “energy efficient windows 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 energy efficient windows 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 energy efficient windows 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, 570 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.

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 energy efficient windows 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 energy efficient windows companies are there based in the United Kingdom?

RevenueBase identified 263 energy efficient windows 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?

Nordan UK LTD, headquartered in Livingston, tops this list with the largest team on record.

Which city has the most energy efficient windows companies?

London leads with 17 headquartered companies, followed by Glasgow (7) and Birmingham (4).

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 570 verified decision-maker contacts tracked across these 263 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.