4B: 130 years of Swiss expertise. Visibly ahead.

Since 1896, 4B has shaped construction and renovation in Switzerland. From the pioneering RF1 renovation window to complex window and façade projects, 4B combines Swiss production, expert support, innovation and distinctive design to create reliable, lasting solutions.

Swiss made, locally close

Production in Hochdorf and ten branches keep expertise close to every project.

Pioneering renovation

RF1 makes window replacement clean, quick and predictable.

One partner, full envelope

Windows, doors, facades and service from planning to completion.

Products, projects and people that make 4B distinctive

From a village joinery to a Swiss building-envelope expert

Founded in Hochdorf in 1896, 4B has grown through four generations of window expertise. Today, around 600 employees develop, manufacture, plan, install and service tailored solutions for homes, residential developments and demanding landmark buildings.

 

The portfolio spans RF1 design renovation windows, NF1 new-build windows, ST2 and PS1 sliding doors, HT2 entrance doors and project-specific façades in wood, metal and glass. Swiss production, digital planning and personal collaboration connect every discipline.

 

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4B at a glance

Rooted in Switzerland, built for ambitious architecture

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Established

1896 in Hochdorf, Canton of Lucerne

Products

Windows, doors, sliding doors and facade solutions.

Produced in

Hochdorf Switzerland

Channels

Private customers, project business, partners and service

Segments

Renovation, new build, residental and commercial projects

Main market

Switzerland, served through ten branches

A next-generation hospital

Designed around children, daylight and nature

For the Children's Hospital Zurich by Herzog & de Meuron, 4B delivered façades, NF1 windows, timber doors and bespoke entrance solutions in wood and glass.

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A pioneering glass-and-timber facade

- makes ambitious architecture possible

At the Swiss Federal Institute of Sport in Magglingen, 4B led the façade delivery, combining NF1 windows with a highly insulated post-and-beam
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Timon Sager

“Our long-standing partnership with 4B is built on close collaboration and mutual trust. For the Zelg project in Uster, 4B manufactured the windows in Hochdorf and delivered them to Schötz exactly when needed. This allowed us to efficiently prefabricate the wall elements at our factory while maintaining a high level of quality, resulting in a win-win situation for both partners."

Timon Sager - Project Manager Holzbau Renggli AG