Ondsauna

Sauna for ONDPARK

Trees grow endlessly upward, a concept reflected in the vertical exterior walls clustered around the sauna room. A spiraling path leads upward to a rooftop relaxation space, mirroring the building's form. The sauna entrance is at GL+250, the cold plunge deck at GL+1000, and the rooftop at GL+3250, so the transition from sauna to cold plunge to open air follows a vertical flow. Viewing the forest at treetop height allows one to share in its growth rhythm.

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Download Press Kit № 165443 Sauna for ONDPARK by Asahi I&R Holdings Inc. to access high-res images, essential texts, translations, and exclusive interviews—all in one.

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Ondsauna by Asahi I amp R Holdings Inc

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Sauna by Asahi I amp R Holdings Inc

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Asahi I amp R Holdings Inc Ondsauna

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Asahi I amp R Holdings Inc Sauna

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Unique Properties

Trees grow endlessly upward, a concept reflected in the vertical exterior walls clustered around the sauna room. A spiraling path leads upward to a rooftop relaxation space, mirroring the building's form. The sauna entrance is at GL+250, the cold plunge deck at GL+1000, and the rooftop at GL+3250, so the transition from sauna to cold plunge to open air follows a vertical flow. Viewing the forest at treetop height allows one to share in its growth rhythm.

Production Technology

An irregular polygonal floor plan guides sightlines, creating varied scenic views. Research shows conversations are twice as frequent at 90 degrees versus side-by-side. Here, strangers sit together, so we chose obtuse-angled benches to balance interaction and privacy, encouraging conversation without intrusion. Varied seating allows for different levels of interaction, while the overall arrangement around a fire fosters a shared experience.

Inspiration

In a sauna, strangers sit nearly naked in close proximity, creating potential intimacy. Yet in Japan, public saunas haven’t fostered this sense of community. By aligning with Japan’s unique sense of closeness, we aim to create a sociopetal space, encouraging shared understanding without forced intimacy. “Non-intrusive” walls balance connection and separation; their verticality resonates with the forest, while their spacing draws nature in and modulates closeness among neighbors.

Project Overview

Ondsauna Sauna has been a Bronze winner in the Architecture, Building and Structure Design award category in the year 2024 organized by the prestigious A' Design Award & Competition. The Bronze A' Design Award is given to outstanding designs that showcase a high degree of creativity and practicality. It recognizes the dedication and skill of designers who produce work that stands out for its thoughtful development and innovative use of materials and technology. These designs are acknowledged for their professional execution and potential to influence industry standards positively. Winning this award highlights the designer's ability to blend form and function effectively, offering solutions that enhance people's lives and wellbeing.

Image Credits

For design images and photos please credit Asahi I&R Holdings Inc..

Bronze Recognition

Asahi I&R Holdings Inc. was recognized with the coveted Bronze A' Design Award in 2025, a testament to excellence of their work Ondsauna Sauna.

Asahi I&R Holdings Inc. Newsroom

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