Company lists · Data refreshed September 2026
Top 25 Custom window builders based in Germany
RevenueBase identified 1,073 custom window builders headquartered in Germany as of September 2026 and tracks 4,561 professional contacts across them, including 1,195 with verified work emails. Berlin is the largest hub.
This list covers custom window builders headquartered in Germany, 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.
The 25 largest custom window builders based in Germany
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 202 contacts → | ||||
Partial evidence “Salamander Industrie-Produkte GmbH and its brand Salamander Window & Door Systems with headquarters in Türkheim/Unterallgäu is one of the leading European quality providers for…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 192 contacts → | ||||
Partial evidence “The name Roto is known throughout the world for innovative, individual and secure fitting systems that increase the added value of windows and doors for people.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 180 contacts → | ||||
Indirect evidence “Das niedersächsische Familienunternehmen aus Bissendorf bei Osnabrück hat sich in fast 30 Jahren national und international einen Namen gemacht.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 148 contacts → | ||||
Indirect evidence “HEIM & HAUS ist das führende Direktvertriebsunternehmen im Markt der Bauelemente.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 89 contacts → | ||||
Indirect evidence “HUECK by Hydro ist ein Unternehmen der Hydro Building Systems und gehört zu den führenden Anbietern von Fenster, Türen- und Fassadensystemen aus Aluminium.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 82 contacts → | ||||
Partial evidence “WICONA by Hydro offers with over 70 years’ experience functional and energy-efficient façades, windows, door and sliding solutions with the highest quality and performance…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 61 contacts → | ||||
Indirect evidence “Beck+Heun ist Entwickler, Hersteller und Verarbeiter von energetisch hocheffizienten Systemen rund um das Fenster.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 57 contacts → | ||||
Indirect evidence “GUTMANN Bausysteme GmbH is an international supplier of system-based aluminium solutions for buildings.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 49 contacts → | ||||
Indirect evidence “Die Medicke GmbH mit Hauptsitz in Glauchau und Niederlassungen in Berlin, Borna, Hamburg und Leipzig beschäftigt 330 Mitarbeiter:innen.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 49 contacts → | ||||
Indirect evidence “HAUTAU ist einer der weltweit führenden Spezialisten für Schiebetechnik und Automation rund um das Fenster.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 47 contacts → | ||||
Indirect evidence “Die Unilux GmbH ist ein mittelständiges und eigenständiges Unternehmen mit über 300 Mitarbeitern am Standort Salmtal.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 46 contacts → | ||||
Indirect evidence “Fondée en 1924 et située à la frontière franco-allemande, LAKAL bénéficie d’une double culture dont les bénéfices rayonnent sur l’ensemble de l’entreprise.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 44 contacts → | ||||
Partial evidence “As part of the Ventana Group, we are the world's leading specialist in the manufacturing of innovative shapes for vinyl windows and doors.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 43 contacts → | ||||
Indirect evidence “FELDHAUS Fenster + Fassaden GmbH & Co.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 40 contacts → | ||||
Indirect evidence “THE FACADE COMPANY - Wir als Gebrüder Schneider Fensterfabrik GmbH & Co.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 36 contacts → | ||||
Partial evidence “GAYKO Fenster-Türenwerk GmbH is a successful and innovative, constantly growing company that offers unique solutions for builders, renovators and architects.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 34 contacts → | ||||
Indirect evidence “Fenster und Haustüren aus Kunststoff und aus Aluminium Qualität und Service der Größenordnung XXL Energieeffizient - Sicher - Barrierefrei XXL ist dabei keine kurzlebige…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 33 contacts → | ||||
Indirect evidence “Wigger Fenster + Fassaden Persönlich.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 31 contacts → | ||||
Indirect evidence “Für jede Anpassung die maßgeschneiderte Lösung - Ob Einzelmaschine oder komplettes Automatisierungssystem, aufstrebender Fensterbaubetrieb oder großes Unternehmen – wir sind der…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 31 contacts → | ||||
Indirect evidence “HAGA ist ein Handwerksunternehmen, das handwerkliches Know-how mit modernster Maschinentechnik und industrieller Prozessqualität verbindet.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 30 contacts → | ||||
Indirect evidence “For more than 35 years, Alu Group and its subsidiaries have been providing high end aluminum building solutions to residential and commercial clients around the Globe.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 28 contacts → | ||||
Indirect evidence “Wer sind wir?” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 26 contacts → | ||||
Partial evidence “AKOTHERM® GmbH has been established as an innovative system supplier for aluminum windows, doors, and facades on the German market and abroad for over 50 years.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 26 contacts → | ||||
Strong evidence “We are your partner for custom-made windows, entrance doors, sliding doors, façades and fire protection doors.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 26 contacts → | ||||
Indirect evidence “Aus der im Jahre 1939 von Rupert App in Leutkirch gegründeten Schlosserei entwickelte sich ein leistungsfähiges Handwerksunternehmen mit drei modernen Fertigungsbetrieben.” Source: RevenueBase Database · checked Sep 19, 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: custom window builders. 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 builders.
- Partial evidence
- Its own public description names part of custom window builders, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name custom window builders. 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 1,073 custom window builders based in Germany
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,195 reachable decision-makers.
Free signup · no credit card
Custom window builders based in Germany at a glance
As of Sep 19, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for Germany, so it is reported there. Company counts and contact totals on this page are exact for Germany, over 1,073 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 builders, 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 Germany whose own description of what they do matches “custom window builders”. 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 builders), 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 builders, and records with no verified work email. Companies headquartered outside Germany 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, 1,195 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.
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 builders, 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 builders are there based in Germany?
RevenueBase identified 1,073 custom window builders headquartered in Germany 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?
Salamander Mywindow, headquartered in Germany, tops this list with the largest team on record.
Which city has the most custom window builders?
Berlin leads with 21 headquartered companies, followed by Dortmund (7) and Hamburg (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 1,195 verified decision-maker contacts tracked across these 1,073 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.
Ready to reach these companies? Verified emails and direct dials for all 1,073 custom window builders based in Germany. Start with a free account, no credit card.
Download this list →Related lists
Custom window builders by geography
- Custom window builders based in Calgary, Canada
- Custom window builders based in Mississauga, Canada
- Custom window builders based in Toronto, Canada
- Custom window builders based in Vaughan, Canada
- Custom window builders based in Mumbai, India
- Custom window builders based in Dallas, United States
- Custom window builders based in Houston, United States
- Custom window builders based in Miami, United States
- Custom window builders based in New York, United States
- Custom window builders based in Argentina
- Custom window builders based in Australia
- Custom window builders based in Austria
Browse the directory
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Custom window builders based in Calgary, Canada
- Custom window builders based in Mississauga, Canada
- Custom window builders based in Toronto, Canada
- Custom window builders based in Vaughan, Canada
- Custom window builders based in Mumbai, India
- Custom window builders based in Dallas, United States