R21 Arkitekter, an architecture firm based in Oslo, Norway, has completed a compact shelter project that strategically combines meticulous attention to architectural detail, flexibility of use, and sustainable construction.

Located amidst the wooded landscape of Kvitfjell, a ski resort just over 200 km north of Oslo, the "3PR Cabin – Tre │ på │ rad" presents itself as a volume of clean lines and understated finishes that blends harmoniously into its surroundings. The project's primary focus was creating a sheltered space of exceptional spatial and material quality.

Stripped of unnecessary embellishments, the "3PR Cabin – Tre │ på │ rad" designed by R21 Arkitekter reveals its constructive logic: the form responds directly to the chosen structure; nothing is hidden. As a result, this tectonic piece, with its dark tones and gabled roof, emerges from the mist and greenery of the surrounding natural landscape.

Conceived as a modular system of 3x3 units arranged around a central core, the design can be adapted to different needs. Depending on the sun's orientation, views, or the topography of the site, the "3PR Cabin – Tre │ på │ rad" can be rotated or mirrored to suit the specific characteristics of each location.

"Cabin 3PR - Tre │ på │ rad" by R21 Arkitekter. Photograph by Ruben Ratkusic.

"Cabin 3PR - Tre │ på │ rad" by R21 Arkitekter. Photograph by Ruben Ratkusic.

Project description by R21 Arkitekter

"Tre på rad" is a cabin developed with the ambition of uniting architectural quality, flexibility, and sustainability in a compact format.

The starting point was a simple idea: to create a compact cabin with a focus on spatial, aesthetic, and environmental qualities.

"Cabin 3PR - Tre │ på │ rad" by R21 Arkitekter. Photograph by Ruben Ratkusic.
"Cabin 3PR - Tre │ på │ rad" by R21 Arkitekter. Photograph by Ruben Ratkusic.

The floor plan is based on a module of 3×3 units. The module can be both mirrored and rotated, therefore the cabin can be adapted to different plots and orientations – depending on sun, view, access and terrain.

The structure defines the form and reveals the constructive logic. The formal coherence and the tectonic character of the piece converge in a total integrity of the project. Nothing is concealed; everything responds to the truth of its construction.

More information

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Architects
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Builder
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RH Kvalitetsbygg AS.

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Dates
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Year of completion.- 2024.

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Location
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Kvitfjell, Ringebu, Oppland, Norway.

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Photography
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R21 is an architecture practice located in Oslo, Norway founded in 2006 by architect Thomas Thorsnes. Their work is focused on the creation of homes, initially cabins, and single-family homes, gradually expanding in scale to encompass housing complexes and urban projects. The office takes on projects from conceptual sketches to the completion of the building to achieve greater control over the quality of the executed work.
 
R21 understands each project as an investigation, striving to maintain a consistent approach with the aim of continuous learning.
 
Their work has earned the recognition of several local awards and it has been featured in both national and international media. The R21 team has contributed to teaching and giving lectures at various universities in Norway.
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Published on: December 16, 2025
Cite:
metalocus, AGUSTINA BERTA
"Material honesty, spatial quality. "Cabin 3PR - Tre │ på │ rad" by R21 Arkitekter" METALOCUS. Accessed
<http://www.metalocus.es/en/news/material-honesty-spatial-quality-cabin-3pr-tre-pa-rad-r21-arkitekter> ISSN 1139-6415
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