Sorpetaler Fensterbau

What Sorpetaler Fensterbau does

Sorpetaler Fensterbau GmbH is a privately held German manufacturer of custom-made wood and wood-aluminum windows and doors, headquartered in Sundern (Hochsauerland region) and operating from the same site since its founding in 1880. The company's product portfolio spans six core window categories — standard wood windows, wood-aluminum windows, sliding windows (Schiebefenster), tilt windows (Schwingfenster), heritage/listed-building windows (Denkmalfenster), and fire-protection windows (Brandschutzfenster) — together with matching front doors (Haustüren) and patio doors (Terrassentüren). All units are manufactured to custom dimensions rather than standard sizes, combining traditional craftsmanship with what the company describes as "high-tech production processes," modern surface treatments, and PEFC-certified sustainable wood sourcing (with approximately 30% recycled aluminum in the wood-aluminum shells). Recent product development includes the E-Schiebefenster, an electrically operated vertical sliding window launched in 2024.

The firm operates a pure B2B2C distribution model: Sorpetaler does not sell directly to end consumers. Instead, it sells exclusively through a network of approved specialist trade partners (Fachhandelspartner), principally carpenters (Schreiner) and building component dealers (Bauelementehändler), who handle on-site consultation, measurement, installation, and end-customer quoting. To support this channel, Sorpetaler provides a partner-only Fensterkonfigurator (window configurator) tool for product specification and pricing. End-customer demand is generated indirectly via social media (Pinterest, Instagram, YouTube), a content/Ratgeber section, free 176-page catalog distribution, and referral through these trade partners. Primary end segments are private homeowners (replacement and new-build, including heritage properties) and listed-building owners requiring Denkmalschutz-compliant products.

Revenue is generated from one-time sales of manufactured windows and doors to trade partners; Sorpetaler does not publicly disclose pricing and has no disclosed subscription, licensing, or recurring revenue component. The company holds RAL Gütezeichen (wood window quality mark), PEFC certification, VFF membership, and BPH certification, and is recognized regionally as a family-friendly employer (Hochsauerlandkreis). Leadership consists of a single named managing director, Stefan Appelhans, who also serves as data protection officer — consistent with a tightly held, family-run Mittelstand enterprise structure. No institutional investors, parent companies, or external funding rounds are disclosed.

Name

Sorpetaler Fensterbau

Legal name

Sorpetaler Fensterbau GmbH

Website

https://sorpetaler.de

Company type

Private

Founded year

1880

Operating status

Operating

Headcount range

51–100 employees

Short description

Sorpetaler Fensterbau is a German manufacturer of custom-made wood and wood-aluminum windows and doors, founded in 1880 and based in Sundern, selling exclusively through approved specialist trade partners (carpenters and building component dealers) serving homeowners and heritage-building owners.

Ownership category

akta.pro rank

Product category

Window and Door Manufacturing

NAICS

Wood Window and Door Manufacturing (321911), Metal Window and Door Manufacturing (332321)

SIC

Lumber & Wood Products (No Furniture) (2400), Metal Doors, Sash, Frames, Moldings & Trim (3442)

akta.pro primary industry

Exterior Doors (IMADAIAA)

Keywords

• Custom wood windows
• Wood-aluminum windows
• Heritage window manufacturing
• Fire protection windows
• Specialist trade partners

Headquarters

HQ city

Sundern

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Custom Wood and Wood-Aluminum Windows and Doors: Sorpetaler manufactures and sells custom-made windows and doors (Fenster und Türen nach Maß) exclusively through specialist trade partners. Revenue is generated from the sale of manufactured products to approved Fachhandelspartner who then sell to end customers including installation.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

Sorpetaler Fensterbau manufactures custom-made wood and wood-aluminum windows and doors at its facility in Sundern, Germany. The product range covers wood windows, wood-aluminum windows, sliding windows, tilt windows, heritage-compliant windows (Denkmalfenster), and fire protection windows (Brandschutzfenster), together with custom front and patio doors. Distribution is exclusively through a qualified specialist trade partner network (Fachhandelspartner) — end customers cannot purchase directly from Sorpetaler.

Product overview

Sorpetaler Fensterbau is a custom-made window and door manufacturer specializing in wood and wood-aluminum products. The portfolio centers on six core window types (wood windows, wood-aluminum windows, sliding windows, tilt windows, heritage windows, and fire protection windows) plus front doors and patio doors. The company also offers the E-Schiebefenster, an electrically operated sliding window variant. A proprietary window configurator platform serves specialist trade partners (carpenters, dealers) for configuration and quotation. Products are manufactured in Germany since 1880, emphasizing craftsmanship combined with modern technology, sustainability (PEFC-certified wood), and longevity.

Differentiator

Problem solved

Functional benefit

Products and services

• Holzfenster (Wood Windows) Custom-made wood windows featuring modern surface treatments, selected materials, and high-tech insulation properties. Designed for thermal insulation and burglary protection, suitable for various architectural styles and heritage applications.
• Holz-Alu-Fenster (Wood-Aluminum Windows) Combination of natural wood interior with durable aluminum exterior cladding. Offers excellent thermal insulation with low maintenance requirements due to aluminum shell containing approximately 30% recycled aluminum.
• Schiebefenster (Sliding Windows) Vertical sliding windows, including heritage-appropriate designs. A specialty product that few other German manufacturers produce.
• Schwingfenster (Tilt Windows) Pivot/tilt windows with distinctive opening mechanism. Part of the specialty product range.
• Denkmalfenster (Heritage Windows) Windows specifically designed for listed buildings and heritage properties, meeting strict conservation requirements under German Denkmalschutz regulations.
• Brandschutzfenster (Fire Protection Windows) Specialty windows meeting fire protection standards for commercial and residential applications.
• Haustüren (Front Doors) Custom-made front doors crafted from wood and wood-aluminum, designed to complement the company's window aesthetics.
• Terrassentüren (Patio Doors) Wood and wood-aluminum terrace/patio doors connecting interior spaces with outdoor areas.
• E-Schiebefenster (Electric Sliding Window) Electrically operated vertical sliding window that opens and closes via button press, similar to an electric roller shutter. Available in wood and wood-aluminum versions.

Named customers2 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Two partnerships are on record, tiered minor and core.

• WaldLokalminorStrategic or Co-development PartnerWaldLokal is a local partner that plants trees in the Sorpetal region, specifically in areas damaged by bark beetles. Sorpetaler supports this initiative as part of its sustainability commitment. Climate-stable tree species are planted where bark beetles have caused damage.
• VFF (Verband Fenster + Fassade)coreGTM or Marketing PartnerSorpetaler is a member of the German Window and Facade Association (VFF). Through this partnership, Sorpetaler offers its trade partners access to the VFF funding service and a free VFF funding calculator, helping customers find financing options for window replacements.

Scale indicators3 records

Recent moves4 records

Expansion highlights4 records

Direct peers

• Finstral: South Tyrolean family-owned window manufacturer producing wood, wood-aluminum, and PVC windows with strong sustainability and customization credentials. Comparable as a premium, design-oriented European window specialist.
• Weru Group: German window and door manufacturer specializing in wood, wood-aluminum, and PVC products sold through dealer networks. Comparable direct competitor in the German trade-channel window market.
• Kneer-Südfenster: German manufacturer of wood and wood-aluminum windows and doors, also headquartered in southern Germany with a similar custom-made, quality-focused positioning. Competes in the same specialty wood window segment served by Sorpetaler.
• Gaulhofer: Austrian premium wood and wood-aluminum window manufacturer with strong heritage credentials and design focus. Comparable to Sorpetaler as a specialty mid-sized European window brand emphasizing craftsmanship.
• Internorm: Austrian premium manufacturer of wood, wood-aluminum, and PVC windows and doors, selling across Europe. Directly comparable as a mid-sized specialty window maker with similar product breadth (including sliding and tilt variants) and custom-made positioning.

Broad incumbents

• Schüco: One of Germany's largest aluminum and steel window, door, and façade system manufacturers. A broad incumbent whose aluminum-clad offerings overlap with Sorpetaler's wood-aluminum range, but operates at vastly greater scale across the full building envelope.
• Kömmerling (profine): One of Europe's largest PVC window profile manufacturers under profine Group. A broad incumbent providing the dominant low-cost window material competing against Sorpetaler's premium wood positioning.
• REHAU Windows: Global polymer and building solutions group with a major German PVC window systems business. Competes indirectly with Sorpetaler through trade-channel PVC window systems, representing the mass-market alternative to specialty wood products.
• Aluplast: Major German PVC window profile system supplier serving the trade and fabricator channel. Comparable broad incumbent competing for the same Fachhandelspartner relationships with mass-market price positioning.

Emerging players

• Velux: Danish global leader in roof windows and skylights, with growing electric/smart window offerings. Comparable as a specialty window innovator in adjacent niches (roof-level) and a reference point for Sorpetaler's E-Schiebefenster smart-window direction.

Market position

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/c/Sorpetaler
• Instagraminstagram.com/sorpetaler_fenster/?hl=de
• Pinterestpinterest.de/sorpetaler
• Xx.com/sorpetaler
• Facebookfacebook.com/sorpetaler
• LinkedInlinkedin.com/company/sorpetaler-fensterbau-gmbh

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sorpetaler Fensterbau