Company lists · Data refreshed September 2026

Top 25 Replacement window companies based in the United Kingdom

Name: Replacement window 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 21, 2026 828 companies tracked

RevenueBase identified 828 replacement window companies headquartered in the United Kingdom as of September 2026 and tracks 5,145 professional contacts across them, including 1,280 with verified work emails. London is the largest hub.

This list covers replacement window 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 21, 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 21, 2026 86% judged on-target in blind review

828Companies

5,145Contacts tracked

1,280Verified emails

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The 25 largest replacement window companies based in the United Kingdom

Ranked by team size

Top 25 of 828 replacement window companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to replacement window 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	First Home Improvements	Indirect evidence	Norwich, United KingdomHQ checked Sep 21, 2026	201-500	248 contacts →
	Indirect evidence “First Home Improvements traces its roots to the 1970's and prides itself on installing highly innovative A rated energy saving products unrivaled by many others within our…” Source: RevenueBase Database · checked Sep 21, 2026
2	Nordan UK LTD	Partial evidence	Livingston, United KingdomHQ checked Sep 21, 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 21, 2026
3	Nationwide Windows And Doors	Partial evidence	Rugby, United KingdomHQ checked Sep 21, 2026	501-1,000	126 contacts →
	Partial evidence “Manufacturers and Installers of PVCu Windows and Doors,Composite and Fire Doors and Conservatories to the Retail, Trade and Commercial Sector.” Source: RevenueBase Database · checked Sep 21, 2026
4	Emplas Window Systems	Partial evidence	Wellingborough, United KingdomHQ checked Sep 21, 2026	201-500	117 contacts →
	Partial 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 21, 2026
5	KAT UK Macclesfield	Partial evidence	Macclesfield, United KingdomHQ checked Sep 21, 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 21, 2026
6	Unique Window Systems LTD	Partial evidence	Leicester, United KingdomHQ checked Sep 21, 2026	201-500	71 contacts →
	Partial 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 21, 2026
7	Polyframe	Partial evidence	Lenwade, United KingdomHQ checked Sep 21, 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 21, 2026
8	VBH GB	Indirect evidence	Gillingham, United KingdomHQ checked Sep 21, 2026	51-200	62 contacts →
	Indirect evidence “VBH is the largest company in the hardware sector.” Source: RevenueBase Database · checked Sep 21, 2026
9	Glazerite UK Group LTD	Indirect evidence	Wellingborough, United KingdomHQ checked Sep 21, 2026	201-500	61 contacts →
	Indirect evidence “Glazerite UK Group is a leading trade fabricator offering installers access to one of the most comprehensive product ranges in the industry.” Source: RevenueBase Database · checked Sep 21, 2026
10	CWG Choices Limited	Partial evidence	Corby, United KingdomHQ checked Sep 21, 2026	201-500	50 contacts →
	Partial evidence “CWG Choices Ltd is a double glazing supplier of windows, doors, conservatories and garden studios/offices.” Source: RevenueBase Database · checked Sep 21, 2026
11	Munster Joinery U.K	Partial evidence	Warwick, United KingdomHQ checked Sep 21, 2026	1,001-5,000	45 contacts →
	Partial 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 21, 2026
12	Crystal Windows And Doors LTD	Strong evidence	Romford, United KingdomHQ checked Sep 21, 2026	201-500	43 contacts →
	Strong evidence “Crystal® was started in 1995 to offer a fair and honest service to customers wanting replacement windows and doors.” Source: RevenueBase Database · checked Sep 21, 2026
13	Hazlemere Group	Indirect evidence	High Wycombe, United KingdomHQ checked Sep 21, 2026	51-200	39 contacts →
	Indirect evidence “Hazlemere is a family owned and run double glazing manufacturer and installer based in High Wycombe, Buckinghamshire.” Source: RevenueBase Database · checked Sep 21, 2026
14	Russell Timber Technology	Partial evidence	Glasgow, United KingdomHQ checked Sep 21, 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 21, 2026
15	Dekko Window Systems LTD	Partial evidence	Ashton-under-lyne, United KingdomHQ checked Sep 21, 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 21, 2026
16	Joedan Windows & Doors	Indirect evidence	Tewkesbury, United KingdomHQ checked Sep 21, 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 21, 2026
17	Coral Windows Bradford Limited	Partial evidence	Bradford, United KingdomHQ checked Sep 21, 2026	51-200	34 contacts →
	Partial evidence “Coral Windows are a family run business who have had over 33 years experience within the home improvement industry.” Source: RevenueBase Database · checked Sep 21, 2026
18	Mumford & Wood LTD	Partial evidence	Tiptree, United KingdomHQ checked Sep 21, 2026	51-200	32 contacts →
	Partial evidence “Timber Windows and Doors Established in 1954 Mumford & Wood has since become the UK’s premier manufacturer of high quality timber windows and doors.” Source: RevenueBase Database · checked Sep 21, 2026
19	Kloeber UK LTD	Partial evidence	Somersham, United KingdomHQ checked Sep 21, 2026	51-200	30 contacts →
	Partial evidence “Kloeber offer high quality doors, windows and advanced glazing products.” Source: RevenueBase Database · checked Sep 21, 2026
20	Everglade Windows LTD	Partial evidence	Greenford, United KingdomHQ checked Sep 21, 2026	51-200	27 contacts →
	Partial evidence “At Everglade Windows, we are devoted to progressive thinking and pushing boundaries.” Source: RevenueBase Database · checked Sep 21, 2026
21	Chigwell Window Centre PLC	Partial evidence	Forest Rd, United KingdomHQ checked Sep 21, 2026	51-200	27 contacts →
	Partial evidence “Established in 1996, Chigwell Window Centre PLC (part of Chigwell Group PLC) manufactures, supplies and installs aluminium and uPVC doors and windows for domestic, commercial and…” Source: RevenueBase Database · checked Sep 21, 2026
22	Starglaze Home Improvements	Partial evidence	Lincoln, United KingdomHQ checked Sep 21, 2026	51-200	25 contacts →
	Partial evidence “Established in 1974, Starglaze Home Improvements LLP is one of Lincolnshire’s leading manufacturers and installers of PVC-U and aluminium windows, doors, conservatories, and home…” Source: RevenueBase Database · checked Sep 21, 2026
23	Precision Windows & Doors LTD	Partial evidence	Newmains, United KingdomHQ checked Sep 21, 2026	51-200	24 contacts →
	Partial evidence “Precision Windows & Doors Ltd Lanarkshire is a well-established manufacturer and installer of double glazing windows and doors operating across Scotland since 2004.” Source: RevenueBase Database · checked Sep 21, 2026
24	Clydebuilt Windows & Doors	Indirect evidence	Glasgow, United KingdomHQ checked Sep 21, 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 21, 2026
25	Britannia Windows	Partial evidence	Clevedon, United KingdomHQ checked Sep 21, 2026	51-200	24 contacts →
	Partial evidence “Britannia Windows started as a family business and remains in the family to this day.” Source: RevenueBase Database · checked Sep 21, 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: replacement window 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 replacement window companies.
Partial evidence: Its own public description names part of replacement window companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name replacement window 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 828 replacement window companies based in the United Kingdom

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Replacement window companies based in the United Kingdom at a glance

As of Sep 21, 2026

24.9%Verified-email coverage

6.2Average contacts per company

1-10Median size (employees)

4.1%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

422

11-50

265

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 828 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 replacement window 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 “replacement window 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 replacement window 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 replacement window 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, 1,280 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 21, 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.

Replacement window companies by metro

Replacement window 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 replacement window 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 replacement window companies are there based in the United Kingdom?

RevenueBase identified 828 replacement window 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?

First Home Improvements, headquartered in Norwich, tops this list with the largest team on record.

Which city has the most replacement window companies?

London leads with 34 headquartered companies, followed by Leicester (12) and Norwich (12).

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 1,280 verified decision-maker contacts tracked across these 828 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 21, 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.