300 apartments are being made fit – no one has to move out

The "Unteres Bühl" housing estate in Oberwinterthur has been part of the cityscape for decades. Now the AXA Investment Foundation is tackling this major project. Around 300 apartments are being renovated and 80 new ones added. The most remarkable aspect is not the volume, but the claim that all residents can stay. A large housing estate is getting fit without giving itself up.

Built in three stages between 1974 and 1990, the “Untere Bühl” still characterizes the old town center of Oberwinterthur today. The complex is considered worthy of protection and some of the buildings are still largely in their original condition. Some of them were already renovated in 2015, and the others are now being renovated. The planning application has been approved and construction is scheduled to start at the beginning of 2027.

Nobody has to leave the field
What makes the project stand out is its social consistency. As the asset manager of the AXA Investment Foundation, BNP Paribas designed the refurbishment from the outset in such a way that all tenants can remain in their apartments. The tenants were involved at an early stage, including workshops on outdoor space and design. “Our tenants have been an integral part of the development for years,” says Pascal Messmer, Asset Manager at BNP Paribas. This attitude runs through the entire project.

Extensions that don’t impose themselves
For the extension, AXA is relying on bernath widmer architects, who emerged victorious from a cooperative test planning process. The majority of the extensions and new buildings are made of wood and deliberately reflect the character of the existing buildings. Around 80 barrier-free apartments with 1 to 3 rooms will be created. An addition to the existing apartments, most of which are large today. Residential studios, communal areas and a commercial space are planned on the first floor.

Park remains and becomes more lively
The park-like outdoor space with communal gardens, playgrounds and the kindergarten from 1977 will be retained. The landscape architecture firm ghiggi paesaggi is taking Fred Eicher’s original open space concept and developing it further. New planting and green roof areas strengthen biodiversity and create habitats for small animals and insects. Greenery is planned on some of the roofs of the new buildings. The central pavilion is to be used by the public in future, for example as a daycare center.

Into the future in stages
The project will be implemented in stages, probably up to 2028, with the aim of creating a real estate portfolio with net-zero emissions by 2050. Winterthur is not only gaining refurbished existing buildings, but also 80 new apartments in a mature settlement that knows who it is.