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Sustainable Greenhouse with Sawtooth Roof and Clerestory Windows

Author:
Geoffrey Chew
Sustainable Greenhouse with Sawtooth Roof and Clerestory Windows
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The sawtooth roof design enhances natural light and enables passive cooling, while clerestory windows create a dynamic interaction between the greenhouse and dining areas, culminating in a restaurant that celebrates sustainable agricultural practices in the Icelandic landscape.
5 key facts about this project
01
Sowilō and Jēra runes influence the architectural concept, linking the design to Norse agricultural heritage.
02
The sawtooth roof design maximizes natural light while facilitating passive cooling throughout the space.
03
Clerestory windows improve ventilation and create a visual connection between the greenhouse and dining areas.
04
The building's orientation optimizes sunlight exposure and enhances views of the surrounding landscape.
05
Accessibility features ensure all public areas are navigable for individuals with mobility challenges.

The Greenhouse Restaurant, known as Sowilō + Jēra, sits near the Mývatn Nature Baths in Iceland. It serves as both a dining space and a greenhouse, embodying the area's agricultural heritage. The design draws from the practices of Norse farmers, making use of the Sowilō and Jēra runes from the Elder Futhark. This connection to history highlights themes of growth and sustainability while contrasting with the surrounding landscape's beauty.

Site Planning
The positioning of the restaurant considers the topography and the views from nearby attractions. The parking area is situated to the north, allowing guests to approach from the south, where the ground levels off. This decision optimizes access and minimizes disruption to the natural scenery. The design respects nearby structures by aligning similar roof lines and colors, all while maintaining a suitable distance from the site boundary.

Spatial Organization
Inside, the restaurant’s layout promotes easy movement, with the long side oriented to the south to capture sunlight. This arrangement allows ample natural light to brighten the dining areas. Non-greenhouse spaces are rotated to provide views of Haverfjall volcano, connecting diners with the surrounding landscape. This careful organization enhances functionality while creating a pleasant experience for visitors.

Sustainable Design Features
The restaurant features a sawtooth roof that aids in passive cooling and maximizes sunlight for the greenhouse. Clerestory windows help hot air escape, keeping the interior comfortable for both plants and diners. The design takes advantage of natural ventilation to support energy efficiency, reflecting an intention to reduce environmental impact.

Accessibility
Accessibility stands out in the design, with split levels that cater to individuals with mobility needs. Ramps and platform lifts ensure that all public areas are reachable without assistance. This focus on inclusivity aligns with modern standards for public spaces and improves the overall experience for all guests.

The thoughtful interplay of light within the restaurant is evident in the sawtooth roof and large clerestory windows. They bring the outside in, allowing diners to enjoy both their meals and the view of the plants growing within the space.

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The Buildner’s Unbuilt Award 2025 is an international architecture competition dedicated to recognizing and celebrating the value of unrealized architectural designs. It invites architects, designers, and students worldwide to submit visionary projects that have not yet been constructed, highlighting the power of ideas and the creativity behind the design process. By focusing on unbuilt work, the competition aims to bring forward concepts that shape the future of architecture and push the boundaries of the profession. 

Participants can compete in three categories based on project scale: Small Wonders (up to 100 m²), Medium Marvels (101–999 m²), and Large Visions (over 1,000 m²). Each category winner will receive €20,000, and additional prizes include honorable mentions, student awards, and a special Best Presentation Award. Winning projects will gain significant international exposure through Buildner’s publicity campaign and a feature article on ArchDaily, providing a unique opportunity to showcase creative ideas to a global audience. 

The Buildner’s Unbuilt Award 2025 encourages entrants to submit any type of unbuilt project, from conceptual visions to detailed designs, celebrating bold innovation without the constraints of realization. Important deadlines: registration closes on October 30, 2025; submissions are due by November 20, 2025; winners will be announced on December 17, 2025.

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