The Oberwilerstrasse apartment building, built in 1962, underwent an extensive renovation by Salathé Architekten Basel. The goal was an energy-efficient modernisation that reflects the zoo’s commitment to sustainability. The city-facing façade now features a harmonious blend of dark green photovoltaic (PV) panels and wooden shutters, combining aesthetics with functionality. The PV panels, installed in just two standard formats, supply renewable electricity for the building, while the larch-wood shutters add warmth and a natural touch.
Balconies were expanded and their concrete slabs replaced with solid wood, improving both thermal performance and living quality. Inside, staircases were upgraded for fire safety, electrical installations modernised, and new windows installed to enhance natural light. The renovation was carefully executed with residents in place, minimising disruptions by completing interior work for each apartment within two weeks.
The design embraced the building’s original 1960s architectural qualities while adding contemporary, sustainable elements. The PV façade required meticulous detailing to integrate the panels with the irregular existing structure, resulting in a sleek yet textured glass-like appearance. The renovation also aligns the building’s history as part of the zoo’s energy infrastructure with its future as a symbol of sustainability, visible beyond the zoo’s boundaries.
