Build Your Own Sauna or Greenhouse

Open‑source modular structures for whatever the function—saunas, greenhouses, offices—built from standard lumber and common tools.

TRY THE WTFOSPHERE™ BUILDER!
~200 2×4s + 4 Sheets
5 Shapes, 22 Modules
<190 Lbs Flatpacked
100% Open Source
$0 License Fees
~7,400L Interior Volume

Use our free configurator to explore the modular system, visualize the structure in 3D, and see how the components come together to create space.

  • Explore Modular Layouts
  • Real-time 3D preview
  • Save and share designs
LAUNCH THE WTFOSPHERE™
WTFosphere™ Configurator Screenshot
Free!

Why This Matters

🔓

Fork it, Hack it, Sell it

Open Source means you can use it commercially, modify it freely, and share your improvements.

🛠️

Hardware-store Parts Only

Built from standard lumber and hardware. No exotic materials or special tools required.

💰

Your $29 Funds Prototypes

When you buy a handbook, you're literally funding the next open-source prototype we build.

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Full CAD + Cut Lists Included

Every handbook includes complete 3D models, 2D drawings, and precise cut lists for zero waste.

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Full Documentation

Complete CAD files, cut lists, assembly guides, and living documentation.

🔗

Ecosystem, Not Just Plans

More than blueprints—join a growing network of suppliers, builders, and fellow makers.

Precision CNC-Cut MDF Templates

Pre-order these professionally manufactured templates – perfect fits, zero waste. Manufactured after reaching minimum order quantities.

🎯 Ecosystem Pre-Order: Building a network of certified manufacturers • Your order funds the first certified partner • Join the open source shelter revolution

🎯

Perfect Fit

Laser-precision cuts ensure every piece fits exactly right.

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Drop-Shipped

Delivered straight to your door from our manufacturing partner.

♻️

Zero Waste

Optimized cutting patterns minimize material waste.

PRE ORDER PAPER OR MDF TEMPLATES

Pre-order system now live! View all available templates →

We're Sequencing From Simple to Complex

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Why Sauna First

Fewest parts, rustic aesthetic, forgiving construction. Perfect for learning manufacturing without needing precision. Your handbook purchase funds us getting good enough to build the complex stuff right.

🏃‍♂️

Crawl → Walk → Run

Sauna (crawl): Basic structure, forgiving tolerances
Greenhouse (walk): More complex, tighter fits
Office/Other (run): Full complexity, zero margin for error

🌱

Why Greenhouse Last

Most parts, tightest tolerances, zero margin for error. Water leaks destroy everything. We're building capability first before tackling the most demanding builds.

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Current Focus: Saunosphere

We're building the simplest, most forgiving structure first. This gets us good at manufacturing while giving you something valuable to build.

Support Development & Get the Plans

Two ways to support: Buy individual handbooks as they're released, or become a Lifetime Supporter and get everything we ever build.

Standard Edition
$29
The Essential Start.
Get the Whole Thiosphere Handbook now. Buy additional handbooks as they release ($25-55 each).
  • ✅ Current PDF Plans
  • ✅ Complete Build Guide
  • ❌ Future Updates
Standard - $29 (SDK Only)
Founder's Edition
$299
Every handbook we ever release, forever. Sauna, greenhouse, office - all of them. Plus direct team access and founder badge.
  • All Future Handbooks
  • Lifetime Updates
  • ✅ Founder's Badge & Swag
Founders - $299

Funding Next Prototype: Saunosphere

Progress to Sauna Prototype $2,950 / $8,500
35%

Latest from the Workshop

Follow our journey building in public. Real progress, real challenges, real solutions.

AI as Cofounder

AI as Cofounder

How we're using AI to accelerate hardware development

Read More →
First Principles Soultioning

First Principles Soultioning

Building from the ground up, questioning everything

Read More →
Not Your Bucky's Dome

Not Your Bucky's Dome

Why we're taking a different approach to modular shelter

Read More →
VIEW ALL BLOG POSTS →

Community Builds

Share your Thiosphere builds with the community! Use the Share button in our configurator to create a link to your design.

👷‍♀️

Call for First Builders!

We are looking for the first 5 makers to document their build process. In exchange for high-quality photos and video, we'll feature you on our main site and send you exclusive Thiosphere swag.

Apply to be a First Builder

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
🧊

✨ 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