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Volcanic Ash Concrete and Cross-Laminated Timber Form a Sunken Community Space

Authors:
Ana Belčič, Klara Prošek
Volcanic Ash Concrete and Cross-Laminated Timber Form a Sunken Community Space

Project in-detail

Constructed with volcanic ash concrete and cross-laminated timber, the sunken structure provides an immersive communal living space that integrates seamlessly with Iceland's striking landscape.
5 key facts about this project
01
The structure is sunken one meter below ground level for enhanced thermal insulation.
02
Volcanic ash concrete is used for both foundations and structural support.
03
Cross-laminated timber panels provide warmth and structural integrity.
04
The design incorporates expansive windows for unobstructed views of the aurora.
05
The central kitchen area serves as a modern interpretation of a traditional mead-hall.

The Granhalle project presents a modern take on the Viking longhouse, situated in a landscape that reflects both cultural history and natural beauty. The design features a longitudinal A-shaped structure that encourages a dialogue with the surroundings. It emphasizes communal living and aims to create spaces that foster social connections while ensuring comfort for all occupants through thoughtful layout and integration with the environment.

Spatial Organization

At the heart of the Granhalle's design is a sunken structure, placed one meter below ground level to improve thermal efficiency and comfort in Iceland's colder climate. The elevated overhanging roof allows for expansive views while providing protection from the elements. Large windows, equipped with seating areas, offer clear sights of the landscape and the aurora borealis, enhancing the interaction between the building's occupants and the natural world around them.

Communal Living Spaces

The Granhalle includes a central area known as the Inner Hearth, which serves as a contemporary version of the traditional mead-hall. This kitchen area is designed to be a gathering space for social interaction, encouraging communal dining experiences. The open layout connects the reception area, living spaces, and a private lounge, creating an inviting environment where people can engage with one another easily.

Structural Considerations

Movement throughout the building is facilitated by carefully designed corridors. Two main corridors lead directly into the communal living area, while an upper corridor provides access to the private sleeping quarters. Stairways are included within the building's concrete structural cores, ensuring both strength and ease of access throughout the space.

Material Usage

Materials chosen for the construction include volcanic ash concrete, used for the foundations and structural support cores. This selection reflects an understanding of local terrain and sustainable practices. Cross-laminated timber is used in the ceiling and flooring, adding warmth and stability to the interior spaces. The split roof design enhances the connection to the Icelandic sky, allowing natural light to fill the corridors and contributing to a positive living experience.

The Granhalle stands as a thoughtful blend of modern design and traditional inspiration, focusing on community, environmental responsibility, and an engaging architectural presence through its careful spatial arrangements and material choices.

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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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