Grotto Sauna V3

Grotto Sauna

Client: Private

Scale: 800 sq ft (75 sq m)

Budget: Withheld

Type: Residential, Spa

Location: Georgian Bay, Canada


Perched on an island’s edge in Georgian Bay, Ontario, the Grotto Sauna is a feat of old-world craftsmanship and new-world sustainability made possible by cutting-edge software and fabrication technology. It is a sculpted space, a sensual experience, and a sophisticated exercise in building science.
Inspired by an Italian grotto, our design pays homage to the extremities of the northern Canadian landscape. To the extent that the objective was to tell an architectural story of escape and refuge, we conceived of a design that married contrasts to transport visitors into an otherworldly sanctum. A simple but dignified exterior built from charred cedar prepared using the traditional Japanese Shou Sugi Ban method conveys a weathered appearance, while the curved interior emulates Lake Huron’s waves as well as the Precambrian shield—a soft, undulating rock surface that has been worn over billions of years.

Importantly, the Grotto is a highly sustainable structure that established a successful methodology for addressing the challenges of building ambitious architecture in remote and environmentally sensitive regions. The site was digitally scanned to create a highly accurate 3D model from which we could analyze and position the structure to minimize site impact while retaining optimum views of the sunsets. We collaborated directly with our fabrication partner, MCM Inc., to develop new prototyping and milling methods.