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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

Project in-detail

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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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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