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Basalt Walls and Mirrored Facades in a Sustainable Longhouse Retreat

Author:
Christina Malterer
Basalt Walls and Mirrored Facades in a Sustainable Longhouse Retreat
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With a structure of basalt walls and reflective facades, the design integrates communal spaces within a subterranean layout, providing an immersive retreat that emphasizes sustainability and connection to the natural surroundings in a guesthouse format.
5 key facts about this project
01
The guest house features a subterranean communal area that enhances social interaction while conserving energy.
02
Each guest cabin is designed with a transparent facade that provides direct views of the surrounding landscape.
03
Construction utilizes locally sourced materials, including birch for the roof framework and basalt for walls.
04
The use of mirrored glass on exteriors allows cabins to reflect their natural surroundings, ensuring minimal visual impact.
05
An outdoor hot tub is incorporated into the design, offering guests a unique way to experience the geothermal environment.

The Thermal Springs Guest House is located in Iceland, designed as a modern interpretation of traditional longhouses. It serves as a unique accommodation option, blending both communal and private spaces while drawing from the architecture of the Viking settlers. The design places a strong emphasis on sustainability and a close relationship with the natural environment, reflecting aspects of Icelandic cultural heritage.

Architectural Layout

A key feature of the design is its thoughtful organization of space. The community area is situated underground, creating a distinct atmosphere. This area has a longitudinal layout that mirrors traditional longhouses, allowing natural light to streams through upper glass sections. This design not only enhances the welcoming feel of the space but also aids in maintaining warmth, which is essential in a cold climate.

Guest Room Design

The guest rooms are located on the upper level and designed as bright cabins that resemble Viking homes. These rooms use translucent roofs and transparent front walls, providing views of the surrounding landscape, including Hverfjall volcano. The mirrored glass on the exterior allows guests to enjoy private moments while still reflecting the beauty of the Icelandic surroundings.

Material Selection

Material choice plays a crucial role in the construction of the guest house. Local birch is used primarily for the roof framework, with Siberian pine as an alternative if necessary. Basalt stone is selected for basement walls and floors, establishing a strong connection to the region's geology. These materials not only emphasize sustainability but also help create an architectural style that fits well within the local context.

Community Engagement Features

The communal space features a centrally located kitchen, promoting interaction among guests. This design element is inspired by historical practices, where the cooking area is at the heart of social activity. Adjacent to the common area, a patio with an outdoor hot tub adds to the overall experience, providing a space for relaxation and socializing. Guests can enjoy their surroundings while engaging with each other in a warm, inviting atmosphere.

The thoughtful integration of these features leads to a design that respects the local history while addressing the needs of modern visitors, resulting in a comfortable and functional space for relaxation and connection.

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The Next House: USA — A Global Call to Reimagine the American Suburb

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Competition organisers

Buildner is launching The Next House: USA, a global architecture competition that challenges architects, designers, and thinkers to reimagine the American suburban home for the 21st century. For decades, the suburban house has symbolized comfort and stability, but today it often reflects excess, isolation, and environmental strain. This competition asks: how can the American home evolve to address climate urgency, economic pressures, and shifting social values?

Participants are tasked with designing a prototype home of no more than 1,500 sq ft (≈140 m²) for a household of two adults and one child. The design should be compact yet generous, adaptable, sustainable, affordable, and replicable across diverse U.S. contexts. More than a design exercise, the competition aims to spark a conversation about how homes can support healthier, smarter, and more connected communities.

The total prize fund is $20,000 USD. The final registration deadline is May 20, 2026, and winners will be announced on September 22, 2026. The Next House: USA invites architects, students, and visionaries worldwide to redefine what the American home means today—and what it should mean tomorrow.

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