Company lists · Data refreshed September 2026
Top 25 Clerestory window manufacturers worldwide
RevenueBase identified 1,271 clerestory window manufacturers worldwide as of September 2026 and tracks 16,971 professional contacts across them, including 6,015 with verified work emails. The United States is the largest market and Toronto the largest hub.
This list covers clerestory window manufacturers worldwide, 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. Country and city lists for clerestory window manufacturers follow the table.
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.
The 25 largest clerestory window manufacturers worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 4,962 contacts → | ||||
Indirect evidence “For more than 80 years, the VELUX Group has created better living environments for people around the world; making the most of daylight and fresh air through the roof.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 2 | 452 contacts → | ||||
Partial evidence “State Window Corporation offers complete design, engineering, manufacturing and installation of custom window wall systems.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 3 | 332 contacts → | ||||
Partial evidence “After 75 years, Kolbe Windows & Doors is best known for superior quality, custom craftsmanship, and attention to detail.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 4 | 314 contacts → | ||||
Indirect evidence “FAKRO is a private company established in Poland in 1991.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 5 | 257 contacts → | ||||
Partial evidence “Weather Shield has been committed to making windows and doors the best way we know how- by putting the wants of our customers first.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 6 | 186 contacts → | ||||
Partial evidence “For more than 20 years, Quest has been able to produce, deliver and stand behind the highest quality and most innovative products in the architectural window, door and window wall…” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 7 | 167 contacts → | ||||
Partial evidence “Western Window Systems is focused on helping people live better through remarkably beautiful moving glass walls and windows that blend the indoors with the outside.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 8 | 147 contacts → | ||||
Indirect evidence “Schipper Kozijnen is een familiebedrijf met 250 betrokken medewerkers.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 9 | 145 contacts → | ||||
Indirect evidence “Avec Schüco, l’habitat de demain se construit aujourd’hui!” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 10 | 135 contacts → | ||||
Strong evidence “Kohltech Windows & Entrance Systems is a leading manufacturer of high-quality, custom window and door products.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 11 | 123 contacts → | ||||
Indirect evidence “Welcome to Graham Architectural Products, where decades of experience and expertise enable us to bring your vision to life.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 12 | 118 contacts → | ||||
Partial evidence “Skyline Windows is a fourth-generation, family owned and operated company.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 13 | 110 contacts → | ||||
Indirect evidence “Estamos há mais de 67 anos no mercado, entregando soluções em vidro com excelência.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 14 | 102 contacts → | ||||
Strong evidence “Founded in 1952, Peerless Products is a leading manufacturer of high-performance, American-made windows and doors.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 15 | 101 contacts → | ||||
Partial evidence “SINCE 1977, WindowRama has established a reputation as the Northeast’s leading window, door, and skylight supplier for homeowners and professionals.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 16 | 101 contacts → | ||||
Indirect evidence “panoramah!” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 17 | 94 contacts → | ||||
Indirect evidence “Solar Innovations® Architectural Glazing Systems is a growing, vibrant company that is motivated to dramatically increase our market share in the building materials space by…” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 18 | 92 contacts → | ||||
Indirect evidence “VELFAC udvikler og producerer vinduer og døre, som sætter standarden med hensyn til dagslysoptimering, udsigt, frisk luft og energieffektivitet.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 19 | 81 contacts → | ||||
Indirect evidence “Our history of innovation is coupled with expertise in historic replication.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 20 | 81 contacts → | ||||
Strong evidence “Fleetwood is a US based company that manufactures high-end, aluminum-framed windows and doors for modern luxury homes across the nation.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 21 | 80 contacts → | ||||
Partial evidence “For over 40 years, Castle Windows has been designing windows to fit your world.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 22 | 79 contacts → | ||||
Strong evidence “Founded in 1988, Vytex is a family-owned and -operated manufacturer of premium vinyl windows and doors.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 23 | 74 contacts → | ||||
Partial evidence “Technical experts in the design, manufacture and supply of engineered, architectural glass rooflights for residential and commercial buildings.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 24 | 72 contacts → | ||||
Strong evidence “Founded in the early 1990's, Panda Windows & Doors manufactures and distributes the finest custom windows and doors in the world today.” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
| 25 | 69 contacts → | ||||
Indirect evidence “MPO Fenêtres est une entreprise fondée en 1970 en Normandie, à Alençon (61).” Source: RevenueBase Database · checked Sep 30, 2026Thanks. The Data Team will review it. | |||||
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: clerestory 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 clerestory window manufacturers.
- Partial evidence
- Its own public description names part of clerestory window manufacturers, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name clerestory 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 1,271 clerestory window manufacturers worldwide
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Clerestory window manufacturers worldwide at a glance
As of Sep 30, 2026Companies by employee count
Email recency is reported on each country list linked below.
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 clerestory 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.
- Coverage
- Every country. Country and city lists for clerestory window manufacturers are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “clerestory 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 clerestory 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 clerestory window manufacturers, and records with no verified work email.
- 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, 6,015 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.
Clerestory window manufacturers by location
9 lists · largest firstEvery Clerestory window manufacturers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Clerestory window manufacturers based in the United States305
- Clerestory window manufacturers based in Italy121
- Clerestory window manufacturers based in Germany81
- Clerestory window manufacturers based in Canada79
- Clerestory window manufacturers based in the Netherlands70
- Clerestory window manufacturers based in the United Kingdom67
- Clerestory window manufacturers based in Australia41
- Clerestory window manufacturers based in France37
- Clerestory window manufacturers based in Spain26
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 clerestory 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 clerestory window manufacturers are there worldwide?
RevenueBase identified 1,271 clerestory window manufacturers worldwide 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?
VELUX, headquartered in Horsholm, tops this list with the largest team on record.
Which country has the most clerestory window manufacturers?
The United States leads with 305 companies, followed by Italy (121) and Germany (81). Every clerestory window manufacturers list by country and city is linked on this page.
Which city has the most clerestory window manufacturers?
Toronto leads with 11 headquartered companies, followed by London (10) and New York (7).
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 6,015 verified decision-maker contacts tracked across these 1,271 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.