A Modular Sauna You Build Yourself
An open-source sauna kit built on the Thios modular standard. Design it in 3D, get your cut list, and build it from standard lumber in 3–4 weekends.
Design Your Sauna → No account required. Start building in seconds. Built on the Thios open standard · CERN OHL v2 licensedCommercial saunas cost $15,000–$40,000 installed. Barrel saunas are cramped, fixed in place, and limited to one layout. Traditional custom builds require contractors, permits, and 3–6 months of waiting. The Saunosphere is a modular sauna kit you build yourself from standard lumber — typically under $7,000 in materials.
Not a PDF — a complete open-source construction system
Complete build plans under CERN Open Hardware License. Modify, share, and improve freely.
Design your layout in our free online tool. Get your exact bill of materials and cut list.
Detailed assembly guide with dimensions, material specs, and photos for every module.
Get quotes from local suppliers. Connect with builders in your area.
Wood-fired barrel stove (15–20 kW) or electric heater. Reaches 100°C in 30 minutes. R-20 insulation holds heat for hours.
Walls, windows, doors, vents — snap together in any layout. Reconfigure anytime without permanent modifications.
Trailer-mounted on a standard flatbed. Tow it to a new site or sell it intact. Under $7,000 in materials.
| Temperature Range | 70 - 100°C (158 - 212°F) |
| Heating Options | Wood-fired (15 - 20 kW) or electric |
| Insulation | Mineral wool, R-20, with vapor barrier |
| Interior Finish | Untreated softwood (spruce, pine, or aspen) |
| Rock Capacity | 20 - 30 kg (44 - 66 lbs) |
| Foundation | Trailer-mounted (towable, mobile) |
| Build Time | 40 - 60 hours (3 - 4 weekends) |
| Materials Budget | $4,000 - $7,000 (including stove and chimney) |
Step-by-step handbook, cut lists, material specs, and assembly guides — plus lifetime updates and community access. From $29.
See Pricing & Editions30-day money-back guarantee · Open-source license included
Design your configuration in our free online tool, then get material quotes from suppliers near you.
Design & Get QuotesEverything you need to build with precision — from templates to jigs.
Precision CNC-cut MDF routing guides and full-scale paper patterns for accurate fabrication.
View Templates →Download STL files for assembly jigs, alignment tools, and drilling guides. Print at home.
Professional-grade steel and aluminum jigs shipped directly to your door.
The Thiosphere™ SDK, the foundation to all our products, is open source hardware. In fact, all Thios products are. Specifically the CERN Open Hardware Licence Version 2 - Strongly Reciprocal.
That's a fancy way of saying that if you want to use our design, even for commercial purposes, you have to share your changes with everyone else.
Get the Whole Thiosphere™ Handbook - the complete guide to modular open source spaces - starting at $29!
Founder's Edition includes lifetime access to all planned handbooks!
