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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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Kingspan MICROHOME 2026: Building Less to Create More

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Competition organisers

The Kingspan MICROHOME 2026 competition invites architects and designers worldwide to rethink small-scale living by creating an off-grid, modular micro dwelling under 25 m². Now in its 11th edition, the contest emphasizes sustainable, innovative, and human-centered design that demonstrates how compact living can have a big impact.

With a €100,000 prize fund, entries will be evaluated for originality, efficiency, and their response to contemporary environmental and social challenges. The competition is open to everyone, with submissions allowed individually or in teams of up to four. Registration closes on 30 September 2026, and winners will be announced on 15 December 2026.

By celebrating creativity within strict limits, MICROHOME 2026 continues to push the boundaries of compact architecture and sustainable living.

MICROHOME 2026

Design a new concept of small-scale home and share a prize fund of 100,000€

100,000 € Prize Fund / Kingpsan Edition #11 ideas COMPETITION
Prize 100,000 €
Eligibility Open to all
Final registration deadline 30 September 2026

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