One System. Endless Possibilities.
A versatile modular building kit built on the Thios open standard. Design any space you can imagine — office, studio, workshop, retreat — and build it yourself from standard lumber.
Design Your Space → No account required. Start building in seconds. Built on the Thios open standard · CERN OHL v2 licensedCustom outbuildings cost $20,000–$60,000 from contractors. Prefab sheds are one-size-fits-all and can't be reconfigured. Converting garages reduces home value. The Flexosphere is a modular building system that adapts to any purpose — design it yourself, build it from standard lumber, and reconfigure it when your needs change.
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.
Office, studio, workshop, meditation space, guest room, music room — the same modular system adapts to any function you need.
Walls, windows, doors, vents, and specialty panels snap together in any configuration. Reconfigure anytime your needs change.
Trailer-mountable on a standard flatbed. Move to a new site, sell it intact, or disassemble and rebuild in a new layout.
| Base Diameter | 3.7 m (12 ft) |
| Floor Area | ~9.3 m² (~100 sq ft) |
| Height | ~3.0 m (~10 ft) |
| Module Count | 22 interchangeable panels |
| Structure | Standard dimensional lumber (2×4, 2×6) |
| Foundation | Pier blocks or trailer-mounted |
| Insulation | R-13 to R-19 (climate dependent) |
| License | CERN Open Hardware License v2 |
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!
Use our free 3D configurator to customize your build - swap modules, change materials, and see it in AR on your phone.
