Case Study: Building the Sauna - A Masterpiece of Design and Craftsmanship
The Sauna named “Kivi” is not just a sauna—it’s a testament to the harmony between architecture and nature, where human innovation meets the raw beauty of the Finnish archipelago. This project, led by Avantoa’s visionary architect Kivi Sotamaa and master craftsman Jonathan Carle, brought a unique structure to life on a remote Finnish island. From initial ideation to the final installation, the entire process was a seamless collaboration that tested the team’s ingenuity and determination.
The Vision: A Sauna that Blends with Nature
Kivi Sotamaa’s design vision for this sauna was clear: it would not be a mere building but a natural extension of its surroundings. The sauna’s design reflects the rugged beauty of the island's rocky terrain and the endless expanse of the sea. The team wanted to create a space that invites deep contemplation, connecting the inhabitants to the powerful elements around them.
The Kivi Sauna’s signature feature is a massive horizontal window that frames the breathtaking views of the archipelago, allowing the sweeping beauty of the sea and sky to become part of the sauna experience. It was designed to shift the perspective away from human-centered architecture, inviting the occupants to feel as though they are part of nature’s grander scale.
“This project is a testament to Avantoa’s ability to deliver a seamless value chain, from the first spark of inspiration to the final installation. ”
Construction: Merging Tradition with Innovation
Building the Kivi Sauna on a remote island presented unique challenges. Access to the site was limited, and every element of the structure had to withstand the harsh, unpredictable conditions of the outer archipelago. The entire construction had to be carefully planned to ensure efficiency without compromising on craftsmanship or quality.




Jonathan Carle, with his background in traditional and modern woodcraft, led the construction phase. The sauna is constructed primarily from mass timber, using Cross-Laminated Timber (CLT) sourced sustainably from Finnish forests. The CLT sheets form the sauna's structure, providing both strength and aesthetic appeal, while the exterior features undulating, curved wooden panels that blend with the island’s rocky landscape.


Sustainability was a key consideration throughout the project. The exterior of the sauna is clad in Leadax, an innovative material made from recycled car window plastic, offering the durability of traditional roofing materials without the environmental cost. This blend of traditional craftsmanship with cutting-edge, eco-friendly materials not only ensured the sauna’s longevity but also aligned with Avantoa’s commitment to sustainable design.
Installation: Overcoming Challenges in the Archipelago
Installing the Kivi Sauna on the island was an ambitious feat. The island’s remote location meant that every phase of the project—from transporting materials to assembling the structure—required careful coordination. The Avantoa team, led by Kivi and Jonathan, worked tirelessly to ensure that the installation was completed smoothly, despite unpredictable weather conditions and logistical challenges.






The team’s dedication to precision and their seamless communication throughout the project ensured that every detail, from the foundation to the final touches, was executed to perfection. The aerodynamic design, combined with its sustainable materials, meant that the Kivi Sauna was not only beautiful but capable of withstanding the extreme conditions of its environment.
The Result: A Masterpiece of Architecture and Craftsmanship
The final result is a breathtaking sauna that feels like it has always belonged on the island. The structure, with its sleek, fish-scale-like exterior and panoramic window, becomes one with the rugged landscape, allowing the natural beauty of the archipelago to shine through.
This project is a testament to Avantoa’s ability to deliver a seamless value chain, from the first spark of inspiration to the final installation. The Kivi Sauna reflects the very best of what Avantoa offers: a unique blend of architectural innovation, masterful craftsmanship, and a deep respect for nature and sustainability.
For the buyer, the value is unparalleled. The Kivi Sauna is not just a luxury addition to their property but a life-changing experience—a sanctuary that fosters a deeper connection to the elements, designed and built by a team whose dedication to excellence and sustainability is evident in every detail.
Kivi and the finished Sauna