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Cave-Like Structure Enhanced by Downy Birch and Geothermal Heating

Author:
Bram Van Klink
Cave-Like Structure Enhanced by Downy Birch and Geothermal Heating
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Constructed with local Downy Birch and utilizing geothermal heating, the building offers a cave-like environment that integrates sustainable practices to support a multifunctional space including a kitchen, bar, and work area.
5 key facts about this project
01
Constructed using locally sourced Downy Birch, enhancing local craftsmanship.
02
Incorporates geothermal heating for sustainable energy use.
03
Features a unique cave-like shape that integrates with the landscape.
04
Includes a sloped turf roof aligned with prevailing wind directions.
05
Designed to foster community interaction through multifunctional spaces.

The architectural design integrates its form with the landscape while focusing on a cave-like experience. Set against the backdrop of traditional Icelandic architecture, the building accommodates various functions such as a kitchen, bar, cafe, and work station. The design encourages a strong connection between the occupants and the natural environment through its careful layout and circulation.

Construction Methodology
The building employs a blend of stone and wood, reflecting methods seen in the Icelandic "turf house." This construction approach allows the structure to resonate with the local architectural tradition. The combination of stone and wood provides both durability and effective thermal performance, which is crucial for the climate. A layer of turf is added for insulation, supporting energy efficiency in the building’s design.

Materiality
A hand-built tower stands out as a significant architectural feature, made from locally sourced Downy Birch wood. This tower not only serves a practical purpose but also highlights local craftsmanship. The use of materials that are native to the area strengthens the connection to the environment and promotes sustainability by supporting local resources.

Climate Strategies
The design includes several strategies aimed at enhancing energy efficiency. Geothermal floor heating makes use of the Earth’s natural heat, maintaining comfortable indoor temperatures. A sloped turf roof is aligned with the main wind directions, further protecting the structure from harsh weather while promoting natural ventilation. Solar panels are integrated into the skylights, enabling the building to generate renewable energy and increase natural light within the interior spaces.

Attention to detail is evident in the way the design balances functionality with the character of the surrounding landscape. The careful choice of materials and climate-responsive strategies create a sense of harmony between the architecture and its natural setting. Elements work together to enrich the experience of the space, ultimately reflecting a thoughtful approach to design that respects both tradition and modern needs.

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

100,000€ Prize / 2025 ideas COMPETITION
Prize 100,000 €
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Final registration deadline 30 October 2025

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