Your Backyard Sauna, Your Way

Design a modular sauna that fits your space and style. Wood-fired or electric, indoor or outdoor — fully customizable with our free 3D configurator.

Design Yours Free No account required. Start building in seconds.

What You Get

Everything you need — build it yourself or hire locally

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Complete Handbook

200+ page guide with material lists, dimensions, and step-by-step instructions. Share with a builder or follow along yourself.

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3D Configurator Access

Design your layout in real-time, swap modules, and export your bill of materials.

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Lifetime Updates

Every handbook improvement, delivered free forever with Lifetime or Founder tier.

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Community

Join makers and homeowners worldwide sharing tips, progress photos, and project stories on Discord.

How It Works

1

Design

Use our free 3D configurator to design your perfect layout.

2

Plan

Get detailed build plans, materials lists, and step-by-step guides.

3

Build

Build it yourself with the handbook, or get quotes from local builders to handle the work.

Why Saunosphere?

Wood-Fired or Electric

Choose your heat source. Traditional wood-burning stove or modern electric heater — the choice is yours.

Modular Design

22 interchangeable modules. Add windows, doors, and ventilation exactly where you want them.

Built to Move

Trailer-mounted foundation. Take your sauna to the lake, the mountains, or your next property.

Technical Specifications

Temperature Range70 - 100°C (158 - 212°F)
Heating OptionsWood-fired (15 - 20 kW) or electric
InsulationMineral wool, R-20, with vapor barrier
Interior FinishUntreated softwood (spruce, pine, or aspen)
Rock Capacity20 - 30 kg (44 - 66 lbs)
FoundationTrailer-mounted (towable, mobile)
Build Time40 - 60 hours (3 - 4 weekends)
Materials Budget$4,000 - $7,000 (including stove and chimney)

Get Build Plans

Complete handbook with step-by-step instructions, materials lists, and CAD files. Starting at $29.

See Pricing & Editions

30-day money-back guarantee. Open-source license included.

Get Quotes from Local Builders

Design your configuration in our free online tool, then get material quotes from suppliers near you.

Design & Get Quotes

Frequently Asked Questions

We recommend stoves rated 15-20 kW for the Saunosphere volume. Popular choices include the Harvia M3, Kuuma Vapor 50, and TimberWolf 9. The handbook includes stove clearance requirements and chimney routing for each option.
A wood-fired stove reaches sauna temperature (80°C/176°F) in about 45-60 minutes. Electric heaters are faster at 30-45 minutes. Once hot, the insulated shell holds temperature for hours.
Absolutely. The R-20 mineral wool insulation and vapor barrier are designed for cold climates. Builders in Minnesota, Finland, and Norway use their Saunospheres year-round, even at -20°F (-30°C).
Proper sauna ventilation requires an intake vent near the heater and an exhaust vent on the opposite wall. The handbook includes exact vent sizing and placement for safe, comfortable air circulation.
In most jurisdictions, yes. The trailer-mounted Saunosphere is designed within standard trailer dimensions and weight limits. You will need a trailer registration and appropriate hitch. Check local towing regulations for specifics.

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OPEN SOURCE HARDWARE


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.

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NEWSLETTER SIGNUP

🔒 We respect your privacy. Your email will never be shared with third parties. Read our privacy policy.

🔥 Our First Product has Launched!

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!

Buy yours today
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✨ Design Your Own Modular Space

Use our free 3D configurator to customize your build - swap modules, change materials, and see it in AR on your phone.

🪄 Open Configurator