What 4B Fenster does

4B AG (trading as 4B Fenster) is a Swiss manufacturer of windows, doors, sliding doors, and facade systems, founded in 1896 as a carpentry workshop in Hochdorf, Switzerland, where it continues to produce all of its products today. The company specializes in wood-metal composite building envelope solutions, with a core portfolio that includes the NF1 window system, the RF1 Design renovation window (installable in 90 minutes), the ST2 and PS1 sliding doors, the HT2 entrance door, and the FS2 mullion-transom facade system. These are supplemented by a solutions layer covering smart home integration, switchable and dimmable intelligent glass, barrier-free living systems, burglary protection, and modular element/system construction, alongside dedicated CAD and BIM planning services for architects.

The business operates a primarily direct-to-consumer and B2B model, serving Swiss homeowners and property owners, architects and planners, general contractors, and housing cooperatives and property managers. Distribution is conducted through a network of physical window exhibition centers and showrooms across Switzerland, a dedicated professional/architect channel with CAD and BIM tooling, and free consultation services, with no public pricing disclosure. The company is a privately held subsidiary of the Scandinavian DOVISTA Gruppe, a European window and facade conglomerate, and references the parent's group-wide sustainability reporting framework rather than publishing standalone financials. Geographic reach is concentrated in Switzerland, with no disclosed international operations.

Name

4B Fenster

Legal name

4B AG

Website

https://4b-fenster.ch

Company type

Private

Founded year

1896

Operating status

Operating

Headcount range

11–50 employees

Ownership category

akta.pro rank

Product category

Windows and Facade Systems

NAICS

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

SIC

Metal Doors, Sash, Frames, Moldings & Trim (3442)

akta.pro primary industry

Architectural Glazing & Fenestration (Curtain Wall, Windows, Storefronts, Skylights) (IMAFAMAC)

akta.pro secondary industries

Storefronts, Curtain Wall & Window Wall Systems (IMADAIAG), Architectural & Building Glazing Systems (Curtain Wall/Storefront/Canopies) (IMADAHAB), Exterior Doors (IMADAIAA)

Keywords

• Wood-metal windows
• Facade systems
• Renovation windows
• Sliding doors
• Building envelope

Headquarters

HQ city

Hochdorf

HQ country

Switzerland

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Window and Facade Product Sales: Sale of windows, doors, sliding doors, and facade systems primarily through direct sales. Products include wood-metal composite windows, renovation windows, balcony doors, entrance doors, and sliding doors. Primarily domestic Swiss market.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

4B Fenster manufactures and sells wood-metal composite windows, doors, sliding doors, and facade systems for the Swiss building envelope market. Core products include the NF1 window system, RF1 design renovation window, NF1 balcony door, HT2 front door, ST2 and PS1 sliding doors, and the FS2 mullion-transom facade system, complemented by intelligent glazing, smart home integration, barrier-free solutions, and burglary protection. All products are produced at the company's headquarters and production facility in Hochdorf, Switzerland.

Product overview

4B is a Swiss window and facade company since 1896, producing in Hochdorf. The company offers a comprehensive product portfolio centered on wood-metal windows and facades, organized into four main product categories: Windows (Fenstersystem NF1, Renovationsfenster RF1 design), Doors (Balkontür NF1, Haustür HT2), Sliding Doors (Schiebetür ST2, Parallelschiebetür PS1), and Facades (Pfosten-Riegel-System FS2). These core products are complemented by specialized solutions including Smart Home integration, intelligent/dimmable glass, barrier-free living systems, and burglary protection. The company also provides supporting services such as BIM planning tools, CAD technical documentation, replacement parts, and maintenance. All products are manufactured in Switzerland with a focus on energy efficiency, sustainability, and quality craftsmanship.

Differentiator

Problem solved

Functional benefit

Products and services

• Fenstersystem NF1 (NF1 Window System)

Quantifiable outcome

• Renovation window installation in 90 minutes

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators3 records

Recent moves5 records

Expansion highlights5 records

Broad incumbents

• Schüco: German global leader in aluminum and steel window, door and facade systems, including curtain-wall solutions comparable to 4B's FS2 Pfosten-Riegel-System. A broader incumbent that overlaps with 4B in commercial fenestration and facades.
• Velux: Danish global leader in roof windows and skylights, plus flat-roof and modular skylight systems. Comparable to 4B as a premium fenestration brand focused on daylighting and intelligent glazing, though specialized in roof rather than vertical facades.
• Reynaers Aluminium: Belgian manufacturer of aluminum window, door and curtain-wall systems for residential and commercial buildings. Comparable to 4B's facade and high-end glazing offerings, though focused on aluminum rather than wood.
• Internorm: Europe's largest window brand, offering wood, wood-aluminum and PVC window systems plus entrance and lift-and-slide doors. Comparable to 4B as a broad European fenestration incumbent expanding into intelligent/smart-home window solutions.
• DOVISTA Group (parent and operating companies): European window and door group (parent of 4B) with multiple regional brands producing wood, wood-aluminum and PVC windows. Comparable as the group-level organization providing strategic, operational and financial context for 4B.

Regional players

• Sky-Frame: Swiss manufacturer of large-format frameless sliding doors and minimal-frame glazing systems. Comparable to 4B's ST2/PS1 sliding door and intelligent glazing portfolio as a Swiss-headquartered premium glazing peer.

Direct peers

• Finstral: South Tyrolean family-run manufacturer of PVC, wood-aluminum and aluminum windows and doors, with strong presence in the Alpine and Swiss markets. Comparable to 4B in product range, premium positioning and focus on building envelope performance.
• Gaulhofer: Austrian manufacturer of wood and wood-aluminum windows and doors with a strong DACH presence. Comparable to 4B in product category (wood-metal composite windows, doors, large glazing) and in serving premium residential and renovation markets in the Alpine region.
• Josko Fenster: Austrian family-owned manufacturer of wood and wood-aluminum windows and doors. Highly comparable to 4B in craftsmanship heritage, wood-metal construction and premium positioning in residential and architectural projects.
• EgoKiefer: One of the largest Swiss window and door manufacturers, with a broad portfolio of wood, wood-metal, PVC and metal windows. Directly comparable to 4B as a Swiss domestic fenestration brand competing in the same renovation and new-build segments.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/4b-fenster

Revenue estimate

Valuation estimate

Number of profiles

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 4B Fenster