HAA&D's architectural practice is rooted in the conviction that the most important buildings of the next decade are ones that already exist. We specialise in Bau im Bestand — the renovation, refurbishment and adaptive reuse of existing structures — threading new spatial concepts, technical systems and contemporary aesthetics into historic and occupied buildings with precision. Alongside new-build projects, we work on complex Altbau renovations across Berlin and Germany, handling the full scope from concept and permit applications through to site coordination and completion.