Drumlin with polyhedron, Hirzel, Switzerland

Drumlin with polyhedron, Hirzel, Switzerland


Various factors affected the design of this single family home: The clients submitted their ideas for living and residing. The building authorities set guidelines for protection of the local architectural heritage. The architects thus shaped a multiply folded structure with a unique character, which does justice to both the surroundings and inner life.

Michael Hanak The hilly landscape between Lake Zurich and Lake Zug in Switzerland is particularly beautiful. The elongated, oval hills once formed by glacial drift are called drumlins. On each hill is a tree. There, on the edge of a farming village, a married couple fulfilled their dream of a single family home. They didn’t want a conventional house, but instead, one entirely unique in a contemporary architectural language. The architects Christa Stutz and Benno Kohli took the ideas and concepts of the clients, which emerged over the course of several conversations, and developed from them the design of the house with its unique outer shape.


An advantage of the
freestanding single
family home is that all
four cardinal points
can be made tangible.

Benno Kohli, architect


Based on this realization, the architects viewed the building as a unit: all its sides should be designed and materialized equally. The roof, which is clearly visible from the driveway, is conceived as a fifth façade.


Roof as design theme

©Jürg Zimmermann


A few materials came into consideration for an equal treatment of the façades and roof. Shortly thereafter, the decision was made to use large-format, silver-gray fiber cement panels with reduced form, sheet metal closures. The architects had the fiber cement panels of varying dimensions installed in horizontal layers. The windows, also of various sizes—some flush fitting on the exterior, some attached inside—seem freely distributed following inner laws without taking into consideration the panel alignment. Building regulations limited the house’s form. The building authorities rejected a strong deviation from local custom. In the single-story residential zone, only low building heights are allowed, and platform roofs are prohibited. Additionally, the roof should be shingled, but not the façade.


The zoning and roof guidelines
limited the design so greatly,
that the roof as a theme became
a fundamental idea.

Christa Stutz, architect


The architects thus elevated the roof form to become an underlying design theme. Various pitches and irregular geometries define the roof’s appearance, as does a succinct structure added on as a central skylight, which flows seamlessly into the façade. The side façades are multiply buckled, and an incision in the northwest corner forms a courtyard. In this way, a uniformly enveloped, irregularly shaped structure arose. On the one hand, the attractive landscape with the distant mountain peaks was taken as a theme, while on the other hand, it guaranteed orientation toward the evening sun.


Living space

©Jürg Zimmermann


The large living space on the southeast side opens toward the impressive panorama with extensive, floor-to-ceiling glazing. By virtue of a ribbon window that is led down to the floor and around the corner, the eating area adjacent to the living space maintains a strong relationship to the protruding, northwest courtyard, which remains introverted and calm, surrounded by a retaining wall and planted with an orchard of beech trees.


Eating area

The eating area is at the center of the spatial relations: surrounded by the courtyard and directly below the skylight, it leads seamlessly into the living space and creates visual contact to the gallery on the upper floor.


©Jürg Zimmermann



Key Facts

Single family home


Dorfstrasse 13, Hirzel, Switzerland


Peter Dünki, Hirzel


Christa Stutz & Benno Kohli, Wohlen Switzerland


Jürg Zimmermann, Zurich, Switzerland


Building period


Façade construction
Roland Salm Fassadenbau AG, Schinznach-Dorf


Façade Material
Swisspearl® SWISSPEARL CARAT Sapphire 7060

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