Challenge: The residential complex on Prießnitzstraße, built in the mid-1970s and offering 90 apartments, currently has an energy efficiency rating of E. This means significant energy loss and an urgent need for modernization. The building’s unique architecture—with elevator shafts and stair towers extending above the roofline, and varying heights (Houses 1–3: four stories plus attic; Houses 5–11: seven stories plus attic)—poses a unique challenge for serial renovation. The goal of this first follow-up project by ecoworks for GWW Wiesbadener Wohnbaugesellschaft mbH is to achieve a comprehensive energy retrofit that not only significantly upgrades the property, but also enables building operations to meet the EH 55 standard and achieve energy efficiency class A+.

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Approach: The focus is on adapting and rigorously implementing the serial renovation concept to fit the specific needs of this complex. The entire thermal shell will be renewed. This includes extensive roof insulation, installation of prefabricated, highly insulated façade elements (with new windows and doors), and special solutions for corner windows to ensure natural light. The basement ceiling will also be effectively insulated. Heating will switch entirely to electric heat pumps. A new central ventilation system and a powerful rooftop photovoltaic system (90.9 kWp) will provide local renewable energy. Together, these upgrades will deliver highly efficient, nearly emission-free energy for the entire complex.

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Outcome: The project will transform the complex into an efficiency house meeting the EH 55 standard and achieving energy efficiency class A+. Forecasts predict a reduction in final energy demand by over 87% and a primary energy demand cut of around 80%. That’s a nominal savings of about 131 kWh/(m²∙a), drastically lowering operating costs. Once completed, the complex will offer residents a modern, visually appealing home with climate-neutral operations, maximum comfort, and minimal energy costs. This project demonstrates that serial renovation strategies can succeed—even with complex existing buildings—delivering real value for residents, GWW, and the environment.