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Sand-Cast Concrete Walls Framing a Lush Greenhouse Experience

Authors:
Laura Castellari Affonso, Sofia Toi
Sand-Cast Concrete Walls Framing a Lush Greenhouse Experience
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Constructed with sand-cast concrete walls, the design creates an immersive environment where visitors transition from a confined tunnel to an expansive greenhouse, facilitating a unique experience of dining amid cultivated vegetation.
5 key facts about this project
01
The structure utilizes sand-cast concrete for both durability and texture.
02
The design features two connected equilateral triangles, enhancing spatial dynamics.
03
A carefully planned visitor journey transitions from darkness to light.
04
The greenhouse integrates elevated flowerbeds to optimize plant growth.
05
Natural light is filtered through specialized glass roof panels to enhance the interior environment.

The Mývatn Greenhouse Restaurant is located in the unique landscape of Dimmuborgir, Iceland. It serves as a space for dining and growing plants, bringing together nature and human activity. The design focuses on creating a journey for visitors, starting from a hidden entrance and leading through an enclosed tunnel to a wide greenhouse. The building draws inspiration from the surrounding geography, making it a natural fit within its environment.

Structural Configuration

The building features two equilateral triangles connected by a tunnel. This shape creates a strong visual link to the flat landscape of Mývatn. Concrete walls define the structure, providing stability and durability against the elements. These walls separate the interior from the exterior while allowing views of the landscape outside.

Material Application

The exterior walls use a sand-casting technique, which helps the structure connect with its environment. This method gives the walls a textural quality that enhances their visual appeal. Constructing these walls on-site minimizes the need for transportation, reducing the building's overall carbon footprint. The concrete serves both functional and aesthetic needs, fitting the overall vision of the restaurant.

Visitor Experience

The entrance is designed simply, hiding the vibrant greenhouse that lies beyond. This choice adds an element of curiosity. As visitors walk through the tunnel, they move from a narrow, dark space into a bright, open area. This shift in light and space is intentional, creating a memorable experience that highlights the contrast between the two environments.

Greenhouse Organization

Inside, the greenhouse has different zones for growing plants. Some areas are at the same level as the restaurant, while others are raised. This organization helps separate various plant species, allowing for effective use of space. Leafy vegetables are planted in higher beds, while other areas accommodate tubers, trees, and shrubs. This thoughtful arrangement benefits both the aesthetics and functionality of the greenhouse.

Natural light streams through the glass roof panels, emphasizing the vibrant plant life inside. The design ensures that the right conditions are created for growth, combining beauty and purpose in a harmonious way.

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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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Competition organisers

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.

Buildner's Unbuilt Award 2025

Celebrating your unbuilt architecture visions with a €100,000 prize

100,000€ Prize / 2025 ideas COMPETITION
Prize 100,000 €
Eligibility Open to all
Final registration deadline 30 October 2025

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