One sphere is a room. Two spheres connected by door panels is a building.
That distinction matters more than it sounds. A single Thiosphere gives you roughly 7,400 liters of usable interior volume — enough for a sauna, a small office, a greenhouse, a meditation room. But the moment you connect two of them through their door panel openings, you get something fundamentally different: a multi-room structure with flow, separation, and purpose.
And here is the part that makes it practical: a duo configuration fits in a standard parking space.
How Door Panels Connect
Every Thiosphere module set includes door panel options — openings that replace a standard wall panel with a framed passageway. When two spheres are positioned adjacent to each other with their door panels aligned, the openings create a natural corridor between the two volumes.
No additional framing. No custom headers. The structural integrity of each sphere remains independent. You are essentially docking two complete structures together through their designed connection points.
The door panel dimensions are standardized across all sphere types. A Saunosphere can connect to an Ergosphere. A Thiosphere can connect to an Agrosphere. The modularity is not just about what each sphere does — it is about how they combine.
The Parking Space Constraint
A standard parking space in the US measures roughly 8.5 feet wide by 18 feet long. Two Thiospheres in a duo configuration, side by side with their door panels touching, fit within that footprint.
Why does this matter? Because a parking space is a unit of land that nearly everyone can visualize. It is the smallest increment of private outdoor space in most urban and suburban environments. Driveways, side yards, unused pads behind garages — these are all parking-space-scale areas that exist on millions of properties right now.
If your build footprint fits in a parking space, your permitting conversations change. Your neighbor conversations change. Your "where would I even put this" conversation disappears entirely.
Use Case: The Backyard Duo
The most natural duo setup is a living function paired with a utility function.
Sauna + Cold Plunge Room. The classic Nordic wellness loop. One sphere is your Saunosphere with a wood-burning or electric heater. The connected sphere is a changing room, cool-down space, or shower area. Walk through the door panel from hot to cold without stepping outside.
Office + Meeting Room. One sphere is your focused work environment. The other is where you take calls, host a collaborator, or just stand up and change context. Two rooms, one structure, zero commute.
Greenhouse + Potting Shed. The Agrosphere handles growing. The connected sphere handles soil prep, tool storage, and seed starting. A complete growing operation in a footprint smaller than a compact car.
Guest Suite. One sphere is the sleeping area. The other is a sitting room or bathroom vestibule. Suddenly you have a guest house that fits next to your garage.
Structural Independence
Each sphere in a duo is structurally complete on its own. They do not lean on each other. They do not share load paths. If you disconnected them tomorrow — replaced the door panels with standard wall panels — each one would stand independently with zero modifications.
This matters for two reasons. First, it means you can build them sequentially. Start with one. Use it. Learn from it. Then build the second and connect them when you are ready. Second, it means you can reconfigure. Move one. Rotate the pair. Disconnect and redeploy them on different parts of your property.
The connection is intentional, not structural. That is a design choice, not a limitation.
Flatpack Math
A single Thiosphere flatpacks to under 190 pounds. A duo is roughly double that — call it 375 pounds — spread across panels that individually weigh between 8 and 25 pounds each. Two people can carry every component. No crane. No forklift. No trailer wider than a standard doorway.
The entire duo can be transported in a mid-size SUV with the seats down. Two trips if you are being conservative. One trip if you have a small utility trailer or a pickup bed.
Building a Duo
The build sequence is straightforward:
- Build Sphere A on its foundation points
- Build Sphere B on its foundation points, positioned with door panels aligned
- Remove the temporary panel closures from both door openings
- Connect the threshold trim between the two openings
Total additional build time for the connection itself: maybe 30 minutes. The door panel alignment is self-locating — the panel dimensions and foundation spacing are designed so that when both spheres are correctly positioned, the openings align automatically.
What Comes Next
The duo is the entry point to multi-sphere thinking. Once you see how two spheres create a building, the question naturally becomes: what happens with three? With four? With mixed types?
Those configurations open up a whole different set of possibilities. But the duo is where it starts. Two rooms. One parking space. A building you can carry.
Try the configurator — Place two spheres side by side and see the duo footprint for yourself.
Get the handbook — Complete build plans including door panel connection details.