The Challenge: ‍

The four buildings, comprising a total of 24 residential units built between 1955 and 1957, serve as the starting point for this ambitious modernization. With about 1,600 square meters of rentable space, this is a typical post-war housing stock. The energy supply is decentralized and primarily based on natural gas. The existing balconies and loggias no longer meet today’s standards for comfortable living. The central goal is clear: to carry out an energy-efficient renovation of the building envelope that achieves the demanding KfW Efficiency House Standard 55 EE. But this is about more than just energy efficiency. The project also aims to noticeably improve the quality of life for residents, through new balconies and optimized use of space, among other things.

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The Approach: ‍

To meet our goals, we are using the proven ecoworks facade system for serial renovation. This allows the modernization to be completed quickly, predictably, and with minimal disruption to residents. In addition to the new facade, the roof and basement are insulated. The old gas heating systems are replaced with a centralized, modern system. Going forward, air-to-water heat pumps will provide environmentally friendly heating. Decentralized, efficient instantaneous water heaters will provide hot water. A ventilation system with heat recovery ensures consistently good air quality while saving energy. Photovoltaic systems (over 38 kWp) will be installed on the roofs as full-feed-in systems, contributing to the renewable energy rating. Some buildings will have loggias removed to increase living space, while all apartments will receive new, protruding balconies. Window frames are finished in anthracite (RAL 7016). Each entrance will have a canopy with lighting and motion sensors, and modern mailbox units with intercoms will increase security and convenience.

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The Outcome:

This renovation stands for sustainable, energy-efficient living with additional benefits. Despite the higher efficiency house standard, costs remain comparable to conventional renovations thanks to subsidies. The entire process takes about five months, with all services provided under one contract. Industrial prefabrication ensures high quality, while the minimally invasive exterior work causes little inconvenience for residents. The pilot plan can be adapted for other housing stocks.