The Open-Source Modular Building System
A standardized construction system for small buildings. Constrained panel geometry, interchangeable modules, and standard lumber — design it in 3D and build anything.
Design Your Sphere → No account required. Start building in seconds. Built on the Thios open standard · CERN OHL v2 licensedEvery DIY building project starts from zero — new plans, new materials, new techniques. There is no shared standard for small structures. The Thiosphere changes that: standardized panel geometry, interchangeable modules, and one construction grammar that works for saunas, offices, greenhouses, and anything else you design.
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.
Standardized panel sizes, angles, and connection points — like LEGO for buildings. Learn the system once, build anything.
Roof panels, windows, doors, walls, corners — every piece interchangeable. Standard dimensional lumber from any hardware store.
Study it, modify it, build it, sell it. Share your improvements. The same license used by CERN particle detectors.
| Diameter Options | 10 ft / 12 ft / 14 ft |
| Footprint | ~160 sq ft (fits a standard parking space) |
| Interior Height | 7 ft at working level, 10 ft at peak |
| Modules | 22 interchangeable (roof, wall, window, door, corner) |
| Foundation Options | Plinth, trailer, or casters (removable) |
| Build Time | 40 - 60 hours (3 - 4 weekends) |
| Materials Budget | $2,000 - $5,000 |
| 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.
