Company lists · Data refreshed September 2026

Top 24 Custom window manufacturers based in London, United Kingdom

Name: Custom 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 30, 2026 93 companies tracked

RevenueBase identified 93 custom window manufacturers headquartered in London, United Kingdom as of September 2026 and tracks 424 professional contacts across them, including 111 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers custom 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 30, 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 30, 2026 86% judged on-target in blind review

93Companies

424Contacts tracked

111Verified emails

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The 24 largest custom window manufacturers based in London, United Kingdom

Ranked by team size

Top 24 of 93 custom window manufacturers based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to custom 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	ODC Door And Glass Systems	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	29 contacts →
	Partial evidence “Based in London and Poole, ODC Door & Glass Systems design, manufacture and install high-quality architectural glazing solutions, including folding sliding door systems, glass…” Source: RevenueBase Database · checked Sep 30, 2026
2	Core Sash Windows	Partial evidence	London, United KingdomHQ checked Sep 30, 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 30, 2026
3	Dalcon LTD	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	14 contacts →
	Indirect evidence “We are pleased to announce our expansion in U.K.” Source: RevenueBase Database · checked Sep 30, 2026
4	Ecovia	Indirect evidence	London, United KingdomHQ checked Sep 30, 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 30, 2026
5	Ayrton Bespoke LTD	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	12 contacts →
	Partial evidence “London's leading replacement timber window and door company.” Source: RevenueBase Database · checked Sep 30, 2026
6	Bespoke Glazing Design	Partial evidence	London, United KingdomHQ checked Sep 30, 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 30, 2026
7	Stronghold Security Doors	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	9 contacts →
	Indirect evidence “Welcome to where meticulous craftsmanship meets security expertise.” Source: RevenueBase Database · checked Sep 30, 2026
8	Sashline LTD	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	8 contacts →
	Partial evidence “SashLine provides superior quality Timber Sash Windows, Casement Windows and Door Systems.” Source: RevenueBase Database · checked Sep 30, 2026
9	Panoramah United Kingdom	Partial evidence	London, United KingdomHQ checked Sep 30, 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 30, 2026
10	West Leigh Group	Partial evidence	London, United KingdomHQ checked Sep 30, 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 30, 2026
11	Bennbrook Windows	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	7 contacts →
	Strong 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 30, 2026
12	Prizma Windows Limited	Partial evidence	London, United KingdomHQ checked Sep 30, 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 30, 2026
13	DM Window Solutions	Partial evidence	London, United KingdomHQ checked Sep 30, 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 30, 2026
14	Glaze London	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	5 contacts →
	Indirect evidence “GLAZE LONDON is a specialist provider of architectural glazing and fenestration solutions for both residential and commercial projects across the UK.” Source: RevenueBase Database · checked Sep 30, 2026
15	Hugo Carter	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	5 contacts →
	Partial evidence “Bespoke windows which last a lifetime.” Source: RevenueBase Database · checked Sep 30, 2026
16	Sashed LTD	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	5 contacts →
	Indirect evidence “Sashed are a superior design led and technologically advanced joinery company.” Source: RevenueBase Database · checked Sep 30, 2026
17	Daylight London	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	4 contacts →
	Indirect evidence “The Daylight Difference: Daylight Architectural Glazing source, supply, install and project manage bespoke architectural, structural and specialist glazing for developers…” Source: RevenueBase Database · checked Sep 30, 2026
18	The Blind Company LTD	Indirect evidence	London, United KingdomHQ checked Sep 30, 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 30, 2026
19	Greenmark Joinery	Strong evidence	London, United KingdomHQ checked Sep 30, 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 30, 2026
20	Natural Windows LTD	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	4 contacts →
	Strong evidence “Natural Windows Ltd offers high-quality bespoke wooden windows and doors to private and business customers, architects, building companies, property developers, in London and…” Source: RevenueBase Database · checked Sep 30, 2026
21	SPS Timber Windows	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	4 contacts →
	Strong evidence “SPS Timber Windows is London’s most well-established and trusted manufacturer and installer of bespoke, energy-efficient and fully-finished Accoya® timber windows and doors…” Source: RevenueBase Database · checked Sep 30, 2026
22	European Window Sales EWS	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	3 contacts →
	Partial evidence “EWS offers multiple, high end window systems which include our traditional timber/aluminium composite and our low carbon, passivhaus certified fibreglass composite.” Source: RevenueBase Database · checked Sep 30, 2026
23	Fenstercraft UK	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	3 contacts →
	Strong evidence “We are an international window and door manufacturer, based in Wimbledon, London, but active all over the United Kingdom and Europe.” Source: RevenueBase Database · checked Sep 30, 2026
24	Conessence LTD	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	3 contacts →
	Partial evidence “Timber Windows and Doors, Joinery, Solar Protection” Source: RevenueBase Database · checked Sep 30, 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: custom 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 custom window manufacturers.
Partial evidence: Its own public description names part of custom window manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name custom 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 24 of 93 custom window manufacturers based in London, United Kingdom

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Custom window manufacturers based in London, United Kingdom at a glance

As of Sep 30, 2026

26.2%Verified-email coverage

4.6Average contacts per company

1-10Median size (employees)

Sep 30, 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 93 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 custom 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 “custom 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 custom 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 custom 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, 111 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 30, 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 custom 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 custom window manufacturers are there based in London, United Kingdom?

RevenueBase identified 93 custom 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?

ODC Door And Glass Systems, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most custom window manufacturers?

London leads the United Kingdom with 93 headquartered companies, followed by Norwich (19) and Leicester (17).

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 111 verified decision-maker contacts tracked across these 93 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 30, 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.