Company lists · Data refreshed September 2026

Top 25 Window manufacturers based in London, United Kingdom

Name: Window manufacturers based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 146 companies tracked

RevenueBase identified 146 window manufacturers headquartered in London, United Kingdom as of September 2026 and tracks 747 professional contacts across them, including 232 with verified work emails. London is the largest hub.

This list covers window manufacturers headquartered in London, 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

146Companies

747Contacts tracked

232Verified emails

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The 25 largest window manufacturers based in London, United Kingdom

Ranked by team size

Top 25 of 146 window manufacturers based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to window 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	Windowmaker Software	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	150 contacts →
	Partial evidence “Since 1983, we have been a global leader in providing innovative software solutions to thSince 1983, Windowmaker has developed software exclusively for the window and door…” Source: RevenueBase Database · checked Sep 19, 2026
2	RED Systems Limited	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	35 contacts →
	Indirect evidence “RED Systems helps main contractors and developers plan and deliver £1m to £10m packages across higher-risk residential, mixed-use and regeneration projects.” Source: RevenueBase Database · checked Sep 19, 2026
3	Core Sash Windows	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	19 contacts →
	Partial evidence “The timber-framed window company" Specialties- New Sash and Casement Windows - Double Glazing - Full Restoration - Complete Refurbishment - Draught Proofing We take great pride in…” Source: RevenueBase Database · checked Sep 19, 2026
4	Plantation Shutters LTD	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	18 contacts →
	Indirect evidence “Since 1982 Plantation Shutters have been synonymous with superlative quality, imaginative and distinctive design and exemplary craftsmanship and service.” Source: RevenueBase Database · checked Sep 19, 2026
5	Ecovia	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	13 contacts →
	Indirect evidence “Ecovia is a specialist provider of high-performance architectural timber and glazing solutions tailored for discerning architects and contemporary building projects.” Source: RevenueBase Database · checked Sep 19, 2026
6	Ayrton Bespoke LTD	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	12 contacts →
	Partial evidence “London's leading replacement timber window and door company.” Source: RevenueBase Database · checked Sep 19, 2026
7	TYMAN	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	1,001-5,000	12 contacts →
	Partial evidence “Tyman plc is a leading international supplier of engineered components to the door and window industry.” Source: RevenueBase Database · checked Sep 19, 2026
8	Bespoke Glazing Design	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	11 contacts →
	Partial evidence “Crittall Window Specialist - Cortizo/ Janisol/ Schuco / Smarts Aluminium Bespoke Glazing Design has extensive experience in working with homeowners, architects, interior designers…” Source: RevenueBase Database · checked Sep 19, 2026
9	The Shutter Shop	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	10 contacts →
	Indirect evidence “The Shutter Shop is the UK’s leading family-run business for plantation shutters.” Source: RevenueBase Database · checked Sep 19, 2026
10	Stronghold Security Doors	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	9 contacts →
	Indirect evidence “Welcome to where meticulous craftsmanship meets security expertise.” Source: RevenueBase Database · checked Sep 19, 2026
11	Sashline LTD	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	8 contacts →
	Partial evidence “SashLine provides superior quality Timber Sash Windows, Casement Windows and Door Systems.” Source: RevenueBase Database · checked Sep 19, 2026
12	BSF Group UK	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	7 contacts →
	Partial evidence “BSF Group manufacture, supply and install some of the most pioneering architectural glass technology available today.” Source: RevenueBase Database · checked Sep 19, 2026
13	Panoramah United Kingdom	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	7 contacts →
	Partial evidence “PANORAMAH (UK) LIMITED are specialists in in-house design, manufacture and installation for architectural glazing products.” Source: RevenueBase Database · checked Sep 19, 2026
14	West Leigh Group	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	7 contacts →
	Partial evidence “In 1943 West Leigh were busy repairing the bomb damaged windows and facades of London's buildings.” Source: RevenueBase Database · checked Sep 19, 2026
15	Sash Windows London	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	7 contacts →
	Partial evidence “Sash Windows London is one of the leading suppliers and installers of sash windows & doors across London and Surrey.” Source: RevenueBase Database · checked Sep 19, 2026
16	Bennbrook Windows	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	7 contacts →
	Partial evidence “Bennbrook Windows prides itself on giving its customers an unrivalled combination of exceptional value for money and high quality products.” Source: RevenueBase Database · checked Sep 19, 2026
17	Prizma Windows Limited	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	6 contacts →
	Partial evidence “PRIZMA WINDOWS LIMITED is a double glazing company based out of 23 GORST ROAD LONDON, London, United Kingdom.” Source: RevenueBase Database · checked Sep 19, 2026
18	Original Sash	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	6 contacts →
	Partial evidence “Original Sash is a family owned business with a customer focus and a reputation as a leading timber window and door provider across London and the South East.” Source: RevenueBase Database · checked Sep 19, 2026
19	DM Window Solutions	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	6 contacts →
	Partial evidence “The company is an expert in manufacturing, supplying and installing innovatively designed windows and doors.” Source: RevenueBase Database · checked Sep 19, 2026
20	Blind Technique LTD	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	5 contacts →
	Indirect evidence “Founded in 2004 by John & Richard Pink, Blind Technique is a family run business, providing a full and comprehensive range of made-to-measure blinds, shutters, curtains and…” Source: RevenueBase Database · checked Sep 19, 2026
21	Hugo Carter	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	5 contacts →
	Partial evidence “Bespoke windows which last a lifetime.” Source: RevenueBase Database · checked Sep 19, 2026
22	Sashed LTD	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	5 contacts →
	Indirect evidence “Sashed are a superior design led and technologically advanced joinery company.” Source: RevenueBase Database · checked Sep 19, 2026
23	The Blind Company LTD	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	4 contacts →
	Indirect evidence “An established company headquartered in Kent providing bespoke blinds, shutters & curtains to both the domestic and commercial sector.” Source: RevenueBase Database · checked Sep 19, 2026
24	Greenmark Joinery	Strong evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	4 contacts →
	Strong evidence “Greenmark Joinery is a specialist bespoke window and doors joinery and cabinet manufacturer and installer.” Source: RevenueBase Database · checked Sep 19, 2026
25	Fortress Aluminium Limited	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	4 contacts →
	Indirect evidence “Fortress Aluminium Limited is a mechanical or industrial engineering company based out Russell Gardens, Wickford” 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: window 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 window manufacturers.
Partial evidence: Its own public description names part of window manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name window 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 146 window manufacturers based in London, United Kingdom

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Window manufacturers based in London, United Kingdom at a glance

As of Sep 19, 2026

31.1%Verified-email coverage

5.1Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

1,001-5,000

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 146 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 window 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 London, United Kingdom whose own description of what they do matches “window 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 window 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 window manufacturers, and records with no verified work email. Companies headquartered outside London 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, 232 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.

Window manufacturers by metro in the United Kingdom

Window manufacturers in London146
Window manufacturers in Birmingham35
Window manufacturers in Norwich35
Window manufacturers in Leeds28
Window manufacturers in Glasgow26
Window manufacturers in Bristol25

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 window 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 window manufacturers are there based in London, United Kingdom?

RevenueBase identified 146 window manufacturers headquartered in London, 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?

Windowmaker Software, headquartered in London, tops this list with the largest team on record.

Which city has the most window manufacturers?

London leads with 146 headquartered companies, followed by Birmingham (35) and Norwich (35).

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 232 verified decision-maker contacts tracked across these 146 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.