High-Rise H1 Zwhatt Site in Switzerland

Hybrid, high-rise, low-tech housing solution

High-Rise H1 Zwhatt Site in Switzerland

Hybrid, high-rise, low-tech housing solution

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    High-Rise H1 Zwhatt Site in Switzerland

    Zwhatt flat by studio blomen.

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    Presentation of the Holcim Awards 2023 Acknowledgement for Europe

    For High-Rise H1 Zwhatt Site, Regensdorf, Switzerland (l-r): Laura Viscovich, Executive Director, Holcim Foundation; Belinda Tato (Chair of Jury), Founder of ecosistema urbano, Madrid, Spain; the team from Boltshauser Architekten, Switzerland; and Priya Pawar, Program Manager – Holcim Awards, Holcim Foundation.

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    Holcim Awards 2023 prize announcement - High-Rise H1 Zwhatt Site

    Presenting the Holcim Awards 2023 Acknowledgement winner for Europe - High-Rise H1 Zwhatt Site.

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    High-Rise H1 Zwhatt Site in Switzerland

    Zwhatt north elevation by studio blomen.

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    High-Rise H1 Zwhatt Site in Switzerland

    Zwhatt common area by studio blomen.

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    High-Rise H1 Zwhatt Site in Switzerland

    Zwhatt model by Boltshauser Architekten.

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    High-Rise H1 Zwhatt Site in Switzerland

    Zwhatt plan by Boltshauser Architekten.

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    High-Rise H1 Zwhatt Site in Switzerland

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    High-Rise H1 Zwhatt Site in Switzerland

    Zwhatt detail by studio blomen.

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    High-Rise H1 Zwhatt Site in Switzerland

    Roger Boltshauser. Image: Michael Artur Koenig.

  • Awards Acknowledgement 2023 Europe

A tower of flexible modular apartments for 2,000 residents that concentrates density to reserve land for well-structured outdoor space, and generates around half of the electrical energy required for the apartments via integrated and rooftop photovoltaics.

By Roger Boltshauser - Boltshauser Architekten, Zürich, Switzerland

The high-rise H1 residential tower is part of a new district development adjacent to Regensdorf-Watt railway station, one of the largest localities to accommodate the Zurich region’s growing population. The 75-meter-tall building will provide living space for around 2,000 people in modular apartments that are flexible to accommodate changing needs. By concentrating density within the tower, H1 creates space for generous and well-structured outdoor space and pleasant connections to its surroundings. The design features a recessed façade on the three lowest levels to create an outdoor space and create pleasant connections to its surroundings. Color coated photovoltaic elements integrated into the parapets of the façade provide privacy and shading, and combine with the large-scale photovoltaic system on the roof to generate an energy yield of up to 130,000 kWh/a – meeting approximately half of the electricity requirements of the apartments.

High-Rise H1 Zwhatt Site in Switzerland

Project authors

  • Roger Boltshauser

    Boltshauser Architekten

    Switzerland

High-Rise H1 Zwhatt Site in Switzerland

Zwhatt north elevation by studio blomen.

The high-rise is designed as a hybrid timber-concrete structure that uses prefabricated elements to reduce construction time. Staircases, basement floors, and ceilings will be built in concrete. The load-bearing pillars and down-stand beams as well as the façade will be constructed using beech elements sourced from local forests and processed in Switzerland. Compared to a conventional structure around 20% or 670 tons of CO2 can be saved across the building’s 60-year life cycle.

Project status: Under construction since July 2022.

The jury particularly admired the remarkable integration of the building within the urban context and the meaningful dialogue it establishes with the surrounding public space. Holcim Awards 2023 Jury for Europe

Holcim Awards 2023 prize announcement - High-Rise H1 Zwhatt Site

Presenting the Holcim Awards 2023 Acknowledgement winner for Europe - High-Rise H1 Zwhatt Site.

Project authors

  • Roger Boltshauser

    Principal at Boltshauser Architekten

    Switzerland

Jury appraisal

The jury appreciated several notable aspects of this residential project. They particularly admired the remarkable integration of the building within the urban context and the meaningful dialogue it establishes with the surrounding public space. The thoughtful material selection was also acknowledged, noting the balanced and harmonious combination of timber structural elements with other materials, such as concrete, clay and trass lime. This deliberate choice showcased a commitment to sustainability while adding to the building’s aesthetic appeal.

The sleek and elegant architecture garnered high praise, as it can serve as a source of inspiration not only for low-tech, residential buildings within the Swiss context but also beyond. Overall, the jury appreciated how the design embodied sophistication and innovation, potentially influencing sustainable architectural practices on a broader scale.

High-Rise H1 Zwhatt Site in Switzerland

Zwhatt common area by studio blomen.

Project updates