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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

Project in-detail

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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MICROHOME 10: Celebrating Small-Scale Living with €100,000 Prize Fund and Kingspan’s Innovation

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Competition organisers

The MICROHOME 10 competition invites participants to submit visionary designs for off-grid, modular microhomes that push the limits of sustainable, small-scale living. Organised by Buildner in partnership with Kingspan and Hapi Homes, this tenth edition sets the challenge of designing a dwelling for two people within a maximum floor area of 25 m², encouraging bold solutions adaptable to any urban or rural location. The competition continues Buildner’s mission to foster innovative approaches to compact, energy-efficient housing that can address pressing global challenges.

This year’s edition offers a generous total prize fund of €100,000, including the Kingspan Award for designs that integrate high-performance Kingspan products and the Hapi Homes Award for a project selected for real-world construction. In addition to cash prizes, the winners gain international exposure through Buildner’s media partnerships, publications, and a dedicated MICROHOME magazine, further amplifying their ideas to the wider architectural community.

Key dates for MICROHOME 10 include the closing date for registration on 25 September 2025, the submission deadline on 29 October 2025 (11:59 p.m. London time), and the announcement of winners on 9 December 2025. These milestones ensure participants have clear timelines to develop and present their concepts, with early registration discounts available to support students and emerging designers worldwide.

MICROHOME

Design a new small-scale home concept in the 10th edition of MICROHOME — 100,000 € prize + construction

100,000 € Prize Fund / Kingpsan Edition #10 ideas COMPETITION
Prize 100,000 € + Potential realisation
Eligibility Open to all
Final registration deadline 25 September 2025

Enter an open architecture
competition now

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