The Gewerbehaus K118 in Winterthur is an existing warehouse which has been extended by mainly using reclaimed materials from deconstructed buildings. Featuring repurposed steel beams, granite panels, and aluminum windows, it integrates natural materials like wood, straw, and clay, reducing the construction footprint by 60%.
location
status
typology
project
Winterthur CH
completed
commercial
renovation + extension
Photos: baubüro in situ ag
Plans: baubüro in situ ag
Project
Extension of a warehouse in Winterthur using exclusively reclaimed building components
Timber construction: Zehnder Holz und Bau Winterthur-Hegi CH
Steel construction: Wetter AG Stetten CH
Year of extension
2021
Construction method
Steel Structure with Reclaimed Components
Building type
Commercial building with 12 studios
Floor area (SIA)
1'534 m2
Volume (SIA)
5'809 m3
The Gewerbehaus K118 in Winterthur is a pioneering example of circular construction, transforming an existing warehouse using exclusively reclaimed materials. The three-story extension consists of repurposed steel beams, aluminum windows, and granite panels, sourced from deconstructed buildings. The structure integrates natural materials such as wood, straw, and clay, ensuring a healthy indoor climate while reducing the construction footprint by 60% compared to conventional new builds.
The vibrant orange-red façade, made of reused trapezoidal sheet metal, contrasts with the existing ochre brick hall, creating a striking landmark in the evolving industrial district. Twelve ateliers and workshops, distributed across six floors, are organized around shared kitchens and communal spaces, fostering collaboration and creativity.
As a lighthouse project for sustainable building, K118 demonstrates how circular planning reduces CO₂ emissions and material waste, earning recognition with the Prix Acier 2021 and Holcim Award for Sustainable Construction.
