Energy-efficient refurbishment of a Wilhelminian apartment building

This attic conversion of a typical Berlin apartment building from the Wilhelminian period was to create 3 spacious, bright flats, each with its own roof terrace or loggia. Furthermore, achieving a high energy standard in accordance with KfW guidelines was of great importance. A high level of living comfort and a cosy indoor climate are closely related to energy savings in the ongoing operation of the building.

The old roof truss was replaced by a new wooden construction with few supports, so that the room height and the usable floor space could be optimised by moving the roof level upwards, as well as by generous dormers. In addition, the existing balconies on the courtyard side were renewed, partially moved by one window axis and enlarged. The shape of the street view was largely preserved as it was. The new window openings in the large show gable, the so-called front spit, are adapted to the existing building in terms of design and proportion and are oriented to the window axes of the lower floors.

Since the renovation measures and the conversion of the previously unused attic took place while the existing building was still occupied, the implementation was planned in such a way that almost all flats on the lower floors could continue to be used during the entire construction phase.