Large cedar structure on rocky island surrounded by calm lake and tall trees, resembling spa haven.

PARTISANS Transforms Ice Hut into Cedar and Granite Spa Haven on Muskoka Island

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Written by John Oliver

2026-09-02

The Muskoka Island Spa’s exterior, with its nondescript dark green walls and yellow-trimmed windows, belies the luxury hidden within. Tucked away in Muskoka Lakes, Ontario, this 525-square-foot marvel was once an ice storage hut. Today, it has been meticulously transformed by Toronto-based architecture studio PARTISANS into a cutting-edge thermal spa.

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A Sculptural Interior Awaits

Beyond its modest facade lies a sophisticated interior where cedar and granite intertwine. The journey starts with an outdoor stone shower, suggesting the artistry inside. Crossing the threshold, you’re enveloped in warm, curving cedar walls juxtaposed with organic granite formations that rise dramatically from the floor.

Exterior view of the spa's angular cedar walls with granite base.

Efficient Spatial Design

The spa makes ingenious use of its compact footprint to house a sauna, a cold plunge, a combined shower and steam room, and a massage area. Each space flows seamlessly into the next, offering a sensory progression from intense sauna heat to cooling water, followed by enveloping steam and restful areas.

Close-up of spa with large glass windows reflecting trees.

Ceremonial Use of Granite and Cedar

The interior showcases Canadian Shield granite, reflecting the island’s natural landscape. This stone is not merely decorative; it forms integral parts of the structure, such as seating and basins. The cold plunge, carved directly from granite, exemplifies this union with its natural rock pool aesthetic.

Interior spa space with wood-paneled walls and a stone bench.
Detailed shot of wooden interior with unique natural light patterns.

The Art of Craftsmanship

Creating this cohesive environment was a challenge due to the hardness of Canadian Shield granite, which wore down tools during fabrication. Precision was key, especially given the remote island location that required transporting materials by boat.

The design involved an intricate digital model that interlinked stonework, cabinetry, and other mechanical elements, drawing inspiration from eroded rock formations and traditional art forms.

Granite and cedar details at the spa entrance blending into landscape.

Harmony in Contrasts

Inside, the building’s original purpose as an ice hut is never forgotten. The gabled roof and solid door remain, framing serene island vistas. Now, the structure gracefully guides visitors through dynamic thermal experiences.

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This juxtaposition between past and present shapes a unique ambiance where history and innovation coalesce.

View of spa's exterior integrating with rocky and forested surroundings.
Sunlight illuminating the cedar walls and granite flooring inside spa.

A Testament to Considered Transformation

The Muskoka Island Spa is a study in balancing modesty and grandeur. Its unobtrusive exterior gives way to an interior that is wonderfully immersive and connected to its natural surroundings.

Ultimately, this makeover demonstrates that transformation need not erase the past. Instead, it can honor history while embracing future potential, creating spaces that are as anchored in their origins as they are forward-looking.

Open interior space with natural textures and large windows.

This remarkable blend of history, geology, and architectural storytelling ensures Muskoka Island Spa stands as more than just a luxurious retreat—it embodies a uniquely crafted narrative of transformation.

Island environment surrounding the spa, showcasing water and foliage.

Source: yankodesign.com

Frequently asked questions

What materials are used in the Muskoka Island Spa’s interior?

The interior of Muskoka Island Spa features cedar and granite. Cedar walls and granite formations create a sophisticated atmosphere, with granite also used for seating and basins.

How is space utilized in the Muskoka Island Spa?

The spa efficiently utilizes its 525-square-foot space by housing a sauna, cold plunge, combined shower and steam room, and a massage area, all seamlessly flowing into each other for a sensory progression.

What challenges were faced in crafting the Muskoka Island Spa?

Crafting the Muskoka Island Spa was challenging due to the hardness of Canadian Shield granite, which wore down tools. The remote location also required transporting materials by boat, and precision was crucial in integrating stonework with other elements.