G.S. Georg Stemeseder

What G.S. Georg Stemeseder does

G.S. Georg Stemeseder GmbH is an Austrian family-owned manufacturer of premium aluminum building envelope systems, headquartered in Hof bei Salzburg (Römerstraße 5, A-5322). Incorporated as a GmbH (Firmenbuchnummer 51024k, jurisdiction Landesgericht Salzburg), the company has operated for several decades and self-positions as a know-how leader in premium aluminum systems. Its product portfolio centers on three wood-aluminum window lines (GS Premium, GS Centurio, GS Stratos), a plastic-aluminum system (GS Easy), and the proprietary Premium PQS window sill system with patented sliding-seal closure certified to 1,950 Pa driving rain resistance. The company also offers more than 500 aluminum entrance door model variants, door panels produced under controlled clean-room coating conditions, sun protection products, and a "Perfect Window" integrated system bundling window, sill, sun protection, insect protection, fall protection, and threshold components.

The business serves three primary customer segments: architects and building designers seeking premium materials and design flexibility, builder-owners and renovators focused on long-term value and low maintenance, and B2B trade and construction companies requiring reliable supply and system compatibility. Distribution is multi-channel and direct, combining proprietary e-commerce stores (shop.stemeseder.com for sun protection, tueren-designer.com for entrance door configuration, kat.stemeseder.com for custom sheet metal parts), a registered trade partner portal with PDF catalog downloads, and appointment-based technical and architectural consulting. Marketing supports three languages (German, English, French) and includes a dedicated career portal. Differentiated proprietary technology — the GS Premium weather-resistant coating, Seaside Protect surface treatment for coastal/salted environments, and the only PQS window sill system engineered specifically for wood-aluminum facades — anchors the technical value proposition.

The company generates revenue through one-time sales of aluminum window systems, doors, window sills, sheet metal parts, and related accessories, with quote-based pricing for B2B customers and configurator-driven online ordering for B2C segments. Geographic focus is the DACH region (Austria, Germany, Switzerland) with documented French market presence, while no public listing, venture capital investment, or institutional ownership has been disclosed.

Name

G.S. Georg Stemeseder

Legal name

G.S. Georg Stemeseder GmbH

Website

https://stemeseder.com

Company type

Private

Founded year

2007

Operating status

Operating

Headcount range

11–50 employees

Short description

G.S. Georg Stemeseder GmbH is an Austrian family-owned manufacturer of premium aluminum window, door, and window sill systems serving architects, builders, and trade contractors across the DACH region via direct B2B portals and configurator-driven online stores.

Ownership category

akta.pro rank

Product category

Premium Aluminum Window and Door Systems

NAICS

Metal Window and Door Manufacturing (332321), Sheet Metal Work Manufacturing (332322)

SIC

Metal Doors, Sash, Frames, Moldings & Trim (3442), Sheet Metal Work (3444)

akta.pro primary industry

Windows (IMADAIAC)

akta.pro secondary industries

Window Treatments & Shading Systems (Blinds, Shades, Awnings) (IMADAIAN), Screens, Storm Doors/Windows & Insect Protection Systems (IMADAIAK)

Keywords

• Premium aluminum windows
• Wood-aluminum systems
• Entrance door systems
• Window sill systems
• Aluminum building components

Headquarters

HQ city

Hof Bei Salzburg

HQ country

Austria

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Premium Aluminum Systems Sales: Sale of aluminum window systems, wood-aluminum systems, plastic-aluminum systems, entrance doors, window sills, and related components. Products are available through online stores and B2B registration. The company serves architects, builders, and renovators seeking premium quality construction materials.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

G.S. Georg Stemeseder GmbH designs, manufactures, and sells premium aluminum window systems (GS Premium, GS Centurio, GS Stratos, GS Easy), aluminum entrance doors with over 500 model variants, and the proprietary PQS window sill system. The company also supplies sun protection products, custom sheet metal parts, and door panel systems, together forming an integrated building envelope solution for architects, builders, and trade partners in the DACH region and France.

Product overview

G.S. Georg Stemeseder GmbH offers a comprehensive portfolio of PREMIUM ALUMINIUM SYSTEMS for residential and commercial construction. The product range centers on three wood-aluminum window system lines (GS Premium®, GS Centurio®, GS Stratos®) and one plastic-aluminum system (GS Easy®), all featuring highly weather-resistant GS Premium surface coatings. These window systems integrate with the proprietary PQS aluminum window sill system, the first and only window sill system on the market tailored specifically to Stemeseder's wood-aluminum systems. The company also provides aluminum entrance door systems with over 500 model variants, custom door panel solutions, sun protection products, and insect protection. Supporting digital tools include a 3D door configurator, sheet metal parts configurator, and BIM data for architectural planning. All products emphasize quality, sustainability, and premium surface finishes including a specialized Seaside Protect treatment for coastal environments.

Differentiator

Problem solved

Functional benefit

Brands

• GS Premium: Premium aluminum surface coating system with high weather resistance
• GS Centurio
• GS Stratos
• GS Easy
• PREMIUM PQS
• Seaside Protect
• Perfect Window

Products and services

• Entrance Door Systems Aluminum entrance doors available in over 500 model variants, ranging from sleek modern to traditional Alpine styles, with custom design options and GS Premium color tones. Designed for premium residential and commercial entrance applications.
• Door Panel Systems Design door panels for wood-aluminum, aluminum, and plastic entrance doors, produced using high-tech coating systems under controlled clean room conditions to deliver homogeneous surface finishes.
• Sun Protection Online Shop B2C online store for ordering Suntec sun protection products configured for individual window specifications.
• Sheet Metal Parts Configurator B2B 3D configurator for custom sheet metal bending parts, allowing intuitive configuration of cladding parts with login required. Serves trade partners and construction firms.
• Door Designer Configurator Online configurator for customizing entrance doors based on individual measurements, surfaces, accessories, glass, and handle preferences.
• Premium PQS Window Sill System Aluminum window sill system with sliding-seal closure (GLEIT-DICHT-ABSCHLUSS PREMIUM PQS) providing perfect driving rain sealing at 1,950 Pa tested for non-ventilated facades. The first and only window sill system on the market specifically tailored to wood-aluminum systems.
• GS Premium Window System Wood-aluminum window system featuring highly weather-resistant GS Premium coating, available in numerous premium color tones and almost any RAL color or custom color.
• GS Centurio Window System Wood-aluminum window system setting new standards in quality and technology, compatible with the PQS window sill system.
• GS Stratos Window System Wood-aluminum window system with high weather resistance and quality technology, designed to work with the PQS window sill system.
• GS Easy Plastic-Aluminum System Plastic-aluminum window system combining highest quality materials, best processing, and indestructible GS Premium coating with nearly unlimited color variety.
• Perfect Window System Comprehensive window system connecting window system, window sill, sun protection, insect protection, fall protection, and threshold components. Supported by BIM data for architectural planning integration.

Quantifiable outcome

• Window maintenance eliminated through aluminum exterior protection
• +2 more outcomes

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Scale indicators4 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Rehau Group: Global polymer and building solutions group with significant window, door, and facade system offerings — a broad incumbent whose premium window programs partially overlap Stemeseder's wood-aluminum and PVC-aluminum portfolio.
• Schüco International KG: One of Europe's largest aluminum and steel window, door, and facade system providers with extensive R&D and dealer networks — a broad incumbent whose aluminum portfolio overlaps Stemeseder's premium aluminum window and door systems.
• WICONA (Hydro Extrusion): Hydro's premium aluminum building systems brand for windows, doors, and facades across Europe — a broad incumbent in architectural aluminum systems with overlapping customer base of architects and commercial developers.
• Aluplast GmbH: Large European PVC and PVC-aluminum window systems manufacturer with broad distribution; overlaps with Stemeseder on plastic-aluminum systems and competes for some builder and trade segments in the DACH market.

Direct peers

• Josko Fenster und Türen GmbH: Austrian premium manufacturer of wood and wood-aluminum windows and entrance doors with strong DACH distribution and customization capabilities, competing directly for builder-owner and architect specifications.
• Finstral AG: South Tyrolean premium window and door manufacturer with wood-aluminum and PVC-aluminum systems and a strong Alpine DACH presence; competes for similar architect-led premium residential and renovation projects.
• Kneer-Südfenster GmbH: German premium manufacturer of wood-aluminum windows and entrance doors with strong renovation and custom-builder focus — directly comparable to Stemeseder on premium materials, customization, and DACH builder-owner customers.
• Internorm International GmbH: Austrian family-owned premium window and door manufacturer with wood-aluminum, PVC-aluminum, and timber-aluminum systems serving the same DACH premium builder and architect segment as Stemeseder, making it the closest geographic and product peer.
• Heroal | Johann Henkenjohann GmbH & Co. KG: German manufacturer of aluminum window, door, roller-shutter, and sun protection systems with in-house surface coating — directly comparable to Stemeseder on aluminum systems, surface technology, and DACH distribution.

Regional players

• Alukönigstahl GmbH: Austrian distributor and systems partner for premium aluminum window, door, and facade brands across Central and Eastern Europe; competes in the same Austrian specification channel and overlaps on premium aluminum building envelope projects.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/g-s-stemeseder-gmbh-premium-aluminium-systems

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

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 →

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