The Challenge:
A five-story WBS 70 prefab building in Berlin-Hellersdorf, a widely used housing type, faced the typical energy inefficiencies of its era—high energy losses and an original energy efficiency rating of class D. Like many large housing estates, it was in clear need of modernization. The goal was to radically improve the building’s energy performance through serial renovation, significantly enhance living comfort, and ensure the building’s long-term appeal.

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The Approach:
The project centered on serially renovating the building envelope with precisely fitted, industrially prefabricated façade elements finished in modern fiber cement cladding. This comprehensive renewal was key to boosting energy efficiency. Efficient heat pump systems were installed to provide future-ready heating. New, pre-mounted balconies were added, greatly improving residential quality. The high standard of the building envelope was achieved through detailed planning and precision installation.

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The Outcome:
The renovation led to a dramatic reduction in energy costs by over 40% and upgraded the building’s energy efficiency from class D to class A. The quality of the new building envelope was confirmed by a blower door test, achieving an outstanding n50 value of 0.89 1/h—better than many new builds. Residents now benefit from noticeably improved indoor comfort and lower utility costs, while the building itself has gained significant value and long-term sustainability.