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The idea originated from the urgent need to preserve two collapsing 200-year-old Biedermeier buildings located in a highly protected historic zone in Vienna. Initially planned as a partial renovation, the fragile structures forced a full reconstruction. This challenge sparked a pioneering concept: to authentically rebuild the historic facades while embedding cutting-edge sustainable technology. The concept evolved through close cooperation with heritage authorities, engineers, and architects, resulting in a blueprint for harmonizing cultural preservation with energy efficiency—offering both historical continuity and climate resilience.
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The project sits in the heart of Vienna’s historic Sievering district, known for its village-like charm and traditional wine taverns. By faithfully reconstructing the Biedermeier facades, “Zur Schönen Agnes” preserves the architectural identity of the area while discreetly introducing modern infrastructure. The design respects the surrounding scale, materials, and aesthetics, blending seamlessly into the streetscape. At the same time, green courtyards, facade planting, and energy-neutral technology enhance urban ecology. Glass dormers in the roofline add a light modern accent and give residents unique panoramic views. The project demonstrates how sensitive densification and climate-smart building can strengthen the character of historic neighborhoods rather than compromise them.
Sustainability was central to the project. Strategies included the construction of a deep geothermal system with 24 boreholes (150 m each) to harvest ground-source energy for reversible heat pumps used for heating and cooling. These run on 100% green electricity. A 13.44 kWp PV solar system, fully integrated into the roof structure, supplies additional on-site renewable energy. Passive cooling, natural shading, and greenery on facades and courtyards reduce urban heat. A total of 18 trees were planted, including two in public areas. High-performance insulation, triple-glazed windows, and energy monitoring ensure efficiency. These measures cut energy demand by 90% (Heating Demand 319 to 34 kWh/m²a) and reduce CO₂ by 158 t/year. The project merges sustainability with architecture and design.
Zur Schönen Agnes” is the transformation of two deteriorated 200-year-old Biedermeier buildings in a highly sensitive heritage zone in Vienna into a future-ready, sustainable residential complex. The project’s key strength lies in its successful integration of historic reconstruction and cutting-edge ecological building systems. The original facades were rebuilt true to detail, preserving the architectural identity of the area, while the interior meets the highest standards of modern comfort, energy efficiency, and climate resilience.
A standout feature is the energy system: 24 geothermal probes (150 m each) supply reversible heat pumps for emission-free heating and cooling. These are supported by a 13.44 kWp PV solar array fully integrated into the roof structure. Smart monitoring, passive shading, triple-glazed windows, and extensive greenery—from rooftop to courtyard—contribute to a 90% energy efficiency gain and a reduction of 158 tons of CO₂ annually.
Despite its complexity, the project blends naturally into the historic neighborhood. It demonstrates that ecological innovation, elegant architecture, and heritage preservation can go hand in hand—even under strict monument protection.
Long ago, this house was once a well-known local inn that had fallen into disrepair over the years. Everyone in the district remembered it as an eyesore—until now. Today, it proudly continues its story. Demolition would have been a loss, renovation was no longer feasible, so we chose to reconstruct it in full historic detail. It was by far the best solution. The residents now enjoy living in a house full of history—with all the comfort of modern living.
Ulreich Bauträger GmbH is a Vienna-based real estate developer known for combining high-quality architecture with sustainable technologies. The company specializes in transforming complex urban and heritage sites into energy-efficient, future-ready living spaces. With a strong focus on renewable energy, ecological balance, and user comfort, Ulreich sets new standards in urban development. A signature of every Ulreich building is its distinctive greenery—whether on facades, rooftops, or courtyard spaces—making sustainability visibly integral to design.
