HISTORY AND TASK

The initial situation was an existing terraced housing development. The client’s original wish was to demolish the existing buildings and construct a new development comprising three flats using the most environmentally friendly construction methods possible. During the analysis of the existing development, it became apparent that the existing structure held considerable potential. Through a consistent adaptation concept, a resource-efficient strategy for the project’s realisation was developed.

CONCEPT

This concept is based on the following guiding principle: ‘Strengthen existing strengths, reduce existing weaknesses’, with the aim of enhancing the quality of tried-and-tested elements and sustainably compensating for existing environmental shortcomings through targeted interventions. Applied to the building project, this means:
- enhancing the quality of the outdoor areas
- minimal adaptation of the floor plans
- comprehensive energy-efficiency refurbishment, including the reorganisation of the utility systems

Key elements of the open-space strategy are the so-called ‘tree houses’. These protruding steel structures extend the living space out into the open air in a barrier-free manner, whilst at the same time creating a subtle boundary with the neighbouring units. The garden for all inhabitants is arranged around the community centre in the north-west and is complemented by a terraced tower offering views of the Alps.

Interior adaptations follow a consistent approach: functional structures were retained, and alterations were made only where technically or functionally necessary. Aesthetic preferences were not taken into account as a criterion. The reuse of existing elements (such as floors) was assessed solely on the basis of their condition. The minimal alterations remain visible as traces of the past and are highlighted by deliberate colour markings. Structurally, two of the small flats in each block were merged into a single unit by creating targeted openings in the walls.

As part of the thermal upgrading, the building shell was comprehensively upgraded: windows and doors were replaced, and the external walls were fitted with plinth insulation and cellulose fibre insulation. The loft was also insulated with cellulose. The new roof is fitted with a communal photovoltaic system.

Thanks to a highly efficient heat pump, the existing radiator system could be retained. A communal hydrogen plant was planned with a future-oriented approach, and all the necessary infrastructure was put in place to enable retrofitting at a later date.