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Elevated Retreat with COB Construction and Petal Roof Design

Authors:
Charlotte Heinrich, Celine Kratky, Justina Awadalla
Elevated Retreat with COB Construction and Petal Roof Design
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With a distinctive petal roof and elevated structure utilizing COB construction, the hut offers a sustainable retreat designed for meditation and harmony with the surrounding landscape.
5 key facts about this project
01
Rumdul flower inspiration informs the organic shape of the hut.
02
The structure incorporates a three-petal roof design.
03
COB construction using local materials enhances sustainability.
04
Elevated on stilts to mitigate flooding and improve ventilation.
05
Multifunctional walls provide integrated storage solutions.

The Mitrella Mesnyi sustainable hut is a well-designed structure located in the rural landscape between Phnom Vour Mountain and the south coast of Cambodia. It serves as a retreat and meditation space, merging traditional Cambodian building practices with modern sustainability concepts. The design takes inspiration from the Rumdul flower, known locally as Mitrella Mesnyi. This connection to nature shapes both the forms of the hut and its relationship with the surrounding environment.

Architectural Form

The design features an organic floor plan and a facade that lacks sharp edges. The roof structure resembles three petals, allowing the building to flow with the natural context. By being elevated on stilts, the hut not only embraces traditional construction methods but also provides protection from flooding and improves air circulation. The architecture promotes a strong bond with the landscape and enhances the overall visual experience.

Materiality and Construction

The hut is built using the COB construction method, making use of natural materials like clay, sand, and earth. These materials ensure a low environmental impact during construction while providing good thermal efficiency. The durable COB technique helps the structure withstand common challenges, such as termite damage and seismic activity, making it a sensible choice for long-lasting living spaces.

Spatial Organization

Inside, the layout focuses on openness and practical use of space, creating a calming atmosphere. The living area connects smoothly to the kitchen, relaxation space, and bathroom. This arrangement reflects traditional two-story homes in Cambodia while maximizing efficiency. The staircase leading to a sleeping loft above the bathroom also maintains a welcoming atmosphere and encourages movement throughout the space.

Innovative Features

Storage is cleverly integrated into the walls and stairs, allowing for organization without overcrowding the interior. There is also an outdoor meditation area with wooden planks and a canvas roof, designed for quiet reflection and relaxation. This thoughtful inclusion of both indoor and outdoor elements enriches the experience for occupants, inviting them to connect with nature.

The Mitrella Mesnyi sustainable hut stands out for its unique roof petals and stilted foundation, which both enhance its aesthetic and ensure environmental resilience.

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The Buildner’s Unbuilt Award 2025: Celebrating Architectural Creativity and Visionary Unbuilt Designs with a Total Prize Fund of €100,000

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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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