The Challenge:
In Nienburg/Weser, we are renovating three multi-family buildings constructed in 1950, which are currently classified in energy efficiency class H. The buildings show high energy losses and no longer meet today’s energy standards. As is typical for buildings from this era, there is a clear need for comprehensive energy upgrades to meet current requirements for sustainability, climate goals and living quality. The aim is to significantly improve the energy performance through serial renovation and make the buildings future-proof.

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The Approach:
The renovation focuses on a serial approach: the building envelopes are being modernised using prefabricated facade elements, complemented by high-performance insulation of the roof and basement ceiling. The building services are upgraded and enhanced with efficient ventilation concepts. A particular feature of this project is the connection to an existing heating network, which ensures reliable and efficient heat supply. The combination of these measures raises the buildings to a new energetic standard.

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The Result:
Through the renovation, the buildings progress from energy efficiency class H to class A and reach the Efficiency House 55 standard. Energy demand is significantly reduced, resulting in noticeable savings in energy costs for residents. The project in Nienburg/Weser demonstrates how existing residential buildings can be modernised efficiently and purposefully through serial renovation — creating value for residents, owners and the environment.

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