This question can be a real headache: Can we truly unlock the full densification potential through a renovation and extension, an attic conversion, or by adding additional floors — or does the old building stand in its own way? What threshold must be crossed for it to make economic and energy sense to sacrifice the existing structure?

Fascinating questions! Sometimes, the only way forward is to directly compare two concrete scenarios — as we recently did with a single-family house in Zurich-Albisrieden.