The team headed by 05architekten has largely maintained the height and volumes of the houses. The external walls have been insulated with 20-cm calcium silicate boards and finished with smooth, white render. While sliding shutters and projecting loggias clad in larchwood break up the monotony of the southern facade, double-storey, timber-framed annexes have been erected on the northern elevation in order to provide additional living space. The roof has been seamlessly clad with high-performance mono-crystalline PV modules on the southern side and anthracite roofing tiles on the northern side. The upper floor apartments were extended into the attic space, which included re- moving some internal walls and ceilings in order to open up the space. In contrast to this, most of the roof truss and wooden floorboards have been retained in the rooms.
The new annexes and changes in floor plan layouts have resulted in a greater variety of dwelling sizes, which now range from two to four-room apartments rather than the previous standard three-room apartments. The houses are heated by a ground-source heat pump in the basement, which is connected to 30 helical ground probes. Hot water is provided by decentralised air-to-water heat pumps in the apartments, which use exhaust air as a heat source.
