The architecture firm Stempel & Tesar architekti has designed Villa Sidonius, a structural, architectural and technological experiment in the form of a home. The project is located in Černošice, a residential area in the Czech Republic that has a strong character despite not being defined by a particular architectural style but by the grandeur and scale of the buildings.

Villa Sidonius is located on one of the steepest slopes in the area, so the project is structured around a vertical core that allows the dwelling to be located as high as possible on the property from where it can enjoy the impressive views of the landscape, while also offering easy access to the street below.

The project developed by Stempel & Tesar architekti resembles a steel walkway placed on a steep slope, where it has been turned to obtain the best views of the north and the sun of the south. The ground floor access is joined by a study and a fitness area, which are connected to the upper floor where family life takes place by means of an elevator.

The unfavorable characteristics of the plot conditioned the project, so the project proposes different solutions that push the boundaries, experimenting and testing the most modern technological products and equipment on the market in search of a pleasant indoor climate throughout the year in a house with low heat storage capacity.

Villa Sidonius por Stempel & Tesar architekti. Fotografía por Filip Šlapal.

Villa Sidonius by Stempel & Tesar architekti. Photograph by Filip Šlapal.

Project description by Stempel & Tesar architekti

Černošice’s villa district is a spectacular collection of unique family homes at the northern and western foot of Babka Hill that stand out from their surroundings as one approaches on the road from Prague. Since the villa district dates back to the early twentieth century, it is home to Art Nouveau and First Republic villas. After 1989, Černošice once again became a popular place to construct showcase residential buildings, including in this neighborhood. The locality possesses a strong character that is not defined by any one architectural style as much as by the buildings’ grandeur and scale. Located on steep plots of land, the houses stand out above a path carved into the hillside and lined by the gardens’ retaining walls. Villa Sidonius was not going to be any different.

The villa’s steep property is located on the northern, shaded side of the terrain and is one of the steepest and highest in the neighborhood. This comes with several advantages but also disadvantages and challenges for the project. Without a doubt, the site’s greatest asset is the beautiful view of the Berounka Valley, the hills of the Bohemian Karst, and the Prague skyline in the background. For this reason, the architects have attempted to bring this view into all the living spaces from the best possible angle. The northern slope suffers from a lack of sun, which for most of the day only shines on the highest part of the property – an area that is difficult to reach along the steep slope. The architects were thus faced with the question of how to build the house as high as possible on the property while still providing ease of access.

Villa Sidonius por Stempel & Tesar architekti. Fotografía por Filip Šlapal.
Villa Sidonius by Stempel & Tesar architekti. Photograph by Filip Šlapal.

Their plan, which eliminates these disadvantages while working with these challenges and maximizing the property’s merits, was founded on the concept of hanging houses. The winning form was a bridge-like structure on pillars. The building thus resembles a steel footbridge placed on a steep slope, where it has been turned to face the best northern views and southern sun.

The prefabricated steel structure consists of an external load-bearing section made of HEB 300 profiles, which bridges the eighteen-meter distance between the monolithic reinforced concrete pillars, and of an internal constructional infill primarily consisting of IPE 160 profiles, which serves as a load-bearing framework for the windows, roof, and floors.

Villa Sidonius por Stempel & Tesar architekti. Fotografía por Filip Šlapal.
Villa Sidonius by Stempel & Tesar architekti. Photograph by Filip Šlapal.

The building is a structural, architectural, and technological experiment. There was neither the space nor the desire to design a house using traditional methods; instead, the goal was to find solutions that would push the envelope and test the latest technological products and equipment on the market, such as Swiss air-lux windows with patented air-assisted seals and a heating and cooling system with heat pumps to ensure a comfortable indoor climate all year round in a house with low heat storage capacity.

The building is entered via an underground tunnel from the garage, where one will also find a studio and a fitness area. The tunnel leads to the foot of one of the pillars, where an elevator takes residents to the residential level, passing an intermediate stop with access to the service room. The home’s heart is a cozy living room with a kitchen and dining area. From here, one can access the south-facing terrace, which connects the house with the vegetated terrain and the sunny upper part of the garden with a swimming pool. The protruding parts of the “bridge” contain two different worlds: the world of children’s rooms on one end and the primary bedroom with bath and views on the other.

Villa Sidonius por Stempel & Tesar architekti. Fotografía por Filip Šlapal.
Villa Sidonius by Stempel & Tesar architekti. Photograph by Filip Šlapal.

Close collaboration with the landscape architect Vladimír Sitta led to the idea of a slate slope with birch trees – a novel solution that is in harmony with the building’s overall architectural design. Some of the design aspects, such as the pool and related elements, were the result of this joint effort between architect and landscape designer.

The house is the essence of a unique creative process, which involved not only architects but also a large team of specialists in the design and production of individual parts of the building. The owner of the house also occupies an exceptional position, whose involvement in the entire process of preparation and construction significantly influenced the overall result.

More information

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Architects
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Stempel & Tesar architekti. Lead architects.- Ján Stempel, Jan Jakub Tesař.

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Collaborators
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Landscape architect.- Vladimír Sitta.
Main project engineer.- Aleš Herold.
Structural engineers.- Valbek [Jiří Chodora and Jan Vesecký].
Sun shade supplier.- APAGON.

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Area
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Built-up area.- (house) 330 sqm, (garage) 135 sqm. 
Gross floor area.- 322 sqm.
Usable floor area.- 294 sqm.

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Dates
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Project.- 2016.
Construction start.- 2020.
Completed.- 2024.

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Location
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Černošice. Central Bohemian Region, Czech Republic.

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Manufacturers
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Windows.- Air-Lux.
Sun shade.- SunFurl.
Control system.- Tecomat.
Control system.- JABLOTRON.
Heat pump.- STIEBEL ELTRON.
Ceiling cooling.- UNIVENTA.
Underfloor heating.- REHAU.
Audio equipment.- KEF.
Handles.- M&T.
Lights.- Vibia.
Appliances.- Gaggenau.
Taps.- AXOR.
Bathtub.- RIHO.
Fixtures.- Alape, KALDEWEI, Villeroy & Boch, Grohe.
Shower.- HÜPPE.
Seating.- Désirée.
Table.- Desalto.
Bookcase, coffee tables, dresser.- Lago.
Armchair.- KFF.

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Photography
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Stempel & Tesar architekti is an architectural studio founded in 2008 in Prague by Ján Stempel and Jan Jakub Tesař. Their projects are dominated by the family housing program.

Ján Stempel has become one of the leading architects in the Czech Republic after a 40-year career. He gained his first experience in the SIAL studio and later used this experience as co-owner of the ADNS architectural studio. He became a lecturer at the Faculty of Architecture at CTU Prague.

Jan Jakub Tesař studied at the University of Delft while interning at Jeanne Dekker's architectural office. During his graduation from the Faculty of Architecture in Prague, Ján Stempel, at the time professor and tutor of his final project, contacted him to collaborate and set up the current architecture studio.
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Published on: October 24, 2024
Cite: "Flying over the hill. Villa Sidonius by Stempel & Tesar architekti" METALOCUS. Accessed
<https://www.metalocus.es/en/news/flying-over-hill-villa-sidonius-stempel-tesar-architekti> ISSN 1139-6415
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