House B3 by Aretz Dürr Architektur

Rich surface created by glass, metal and fabric

Project Specs


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Appreciations towards Aretz Dürr Architektur for providing the following description:

业主委托设计师对位于德国Biberach an der Riß市中心的一栋独栋住宅进行向上扩建。原有建筑建于70年代,坐落在一处朝南的陡坡上。从北到南,基地在30米的距离上落差高达10米。房屋包含三个错开的楼层,相互之间没有直接的连接。楼梯与山坡平行,成为分隔生活空间的一道屏障。与花园的连接也未得到充分利用。


▼项目外观,external view of the project ©Luca Claussen Fotografie

The construction task was to raise the height of a single-family dwelling in a central location in Biberach an der Riß. The existing building from the 70s stands on a steep south-facing slope. From north to south, the plot drops by ten meters over a distance of 30m. The house extended over 3 split-level floors, which had no direct spatial connection to each other. The staircase, which ran parallel to the slope, stood as a barrier between the living spaces. Connections to the garden also remained largely unused.

The as-built analysis clearly showed that the building fabric neither structurally nor spatially justified an increase in height and thus the continuation of the existing structure. The realized design therefore removes the staircase, which was perceived as a spatial barrier, opens the living spaces to each other and adds to the solid building, which was partially demolished, on the valley side a steel skeleton structure enclosed in glass in an east-south-west direction, which makes the actual quality of the site tangible and accessible: The flowing living space in the middle of the slightly overgrown garden interwoven with lush vegetation.

▼施工过程,原有建筑外加建钢结构玻璃屋,construction project, adding a steel structured glass house outside the existing building ©Aretz Dürr Architektur


The converted single-family residence becomes a multi-family dwelling consisting of two vertically stagged, self-sufficient and accessible residential units, each connecting to the existing site at ground level.  The first floor, which is the same level as the street, includes an eat-in kitchen, hallway, guest toilet, bedroom, study and bathroom. The lower living unit extends over 3 offset split-level floors with 3 bedrooms, fireplace room, 2 bathrooms and the new living and dining room on the valley-side garden level, to which the fireplace room on entrance level now opens itself. The new exterior staircase leads into this open space structure and provides an unexpected view of the steel frame building, the green garden and the Rotbach Valley. Just as unexpectedly, the elevator begins in the uphill garage, leads over all floors and ends on the garden level.

▼玻璃房中的居住单元,客厅与花园相连,residential unit in the glass house, living space connected with the garden ©Luca Claussen Fotografie


The new building derives its form solely from its structural components and their structural order. 14 slender steel columns (100x100mm) on a 1.95m axial grid support the two floor slabs, which are designed as composite slabs with a 6.50m span. The floor-by-floor wind bracing in the corner bays remains visible. A filigree aluminum post-and-beam façade wraps around the steel structure and plays with the two-story structure of the residential floors, which are divided into three heights.

▼转角处裸露的抗风拉杆,visible wind bracing in the corner ©Luca Claussen Fotografie

▼三层铝制框架与两层楼板形成有趣的互动,aluminum frame divided into three levels playing with the two-floor residence ©Luca Claussen Fotografie


The textile sunshade forms a second level that protects the glass building envelope from overheating in the summer like a veil, while at the same time allowing a view of the garden. Curtains create privacy when needed.

▼遮阳板保证空间隐私,sunshade ensures the privacy of the building ©Luca Claussen Fotografie


The various components of the supporting structure, facade, sunshade and privacy screen create a fabric-like, spatially deep, ephemeral structure that changes depending on the time of year and day, the form of use and the mood of the light.

▼不同构件形成丰富的立面,different components creating a rich facade ©Luca Claussen Fotografie

▼平面图,plan ©Aretz Dürr Architektur

▼立面图,elevations ©Aretz Dürr Architektur

▼剖面图,section ©Aretz Dürr Architektur

Architects: Aretz Dürr Architektur
Area: 120 m²
Year: 2020
Photographs: Luca Claussen Fotografie

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