Residential complex Utendorfgasse

The residential complex on Utendorfgasse in the 14th district of Vienna is the first certified passive house development in Austria (Passive House Institute Darmstadt Certificate). The central innovation of the project lies in achieving the passive house standard while maintaining extremely low construction costs. The use of interdisciplinary dynamic simulation methods allowed for the comprehensive evaluation of the suitability of individual technical concepts (e.g., building construction, ventilation, and heating system) considering various factors such as apartment occupancy, user behavior, climate, and energy supply failures. The residential complex comprises three five-story buildings.

The residential complex was constructed using solid construction techniques and equipped with an all-around highly insulated, permanently airtight and wind-resistant, and thermal bridge-free exterior shell. Particular attention was paid to the thermal decoupling of the base of the load-bearing walls. The apartments are heated via a central ventilation system with highly efficient heat recovery.

The heating demand is 14.49 kWh/(m²a), the heating load is 9.13 W/m², and the total primary energy demand is 107 kWh/(m²a), with an air tightness of n50: 0.18/h (Building 2). Photos: House of the Future/Petra Blauensteiner.