This tiny house plan fits one bedroom and one bathroom into 400 square feet of living space on a single story. The footprint is a plain 18'-0" × 22'-0" rectangle on a foundation, which keeps the framing, roof and foundation simple and helps hold down the cost to build.
Inside, the living area measures 11'-3" × 10'-8" and sits beside the kitchen, which is 7'-4" × 9'-0" and runs along one wall. The bedroom is 8'-4" × 9'-0", and the bathroom is 4'-5" × 10'-8". There is no porch, deck, patio or garage, so the exterior stays a simple box. Actual cost depends on your location, finishes and site conditions, so get local quotes before you set a budget.
Layout highlights
- Single-story rectangle, 18'-0" × 22'-0", built on a foundation.
- Living area of 11'-3" × 10'-8" sits next to the kitchen.
- Kitchen at 7'-4" × 9'-0" runs along one wall.
- Bedroom of 8'-4" × 9'-0" and a full bathroom of 4'-5" × 10'-8".
- No porch, deck, patio or garage, which keeps the shape and scope simple.
Room sizes
| Room | Size | Area |
|---|---|---|
| Bathroom | 4'-5" × 10'-8" | 47 sq ft |
| Living Area | 11'-3" × 10'-8" | 120 sq ft |
| Bedroom | 8'-4" × 9'-0" | 75 sq ft |
| Kitchen | 7'-4" × 9'-0" | 66 sq ft |
Who this plan suits
This plan suits a single person or a couple who want a compact one-bedroom home with a simple, low-complexity shape. It also works for builders pricing a guest house, rental unit or backyard dwelling, where a plain rectangle makes estimating easier.
How this plan was made
It was generated in AI Architectures Plan Studio from this one-line brief: “Tiny house on a 18 x 22 ft rectangular footprint (396 sq ft), one story, on a foundation: simple rectangle that is cheap to build, 1 bedroom, 1 bath, kitchen along one wall, living area. No porch, deck or patio.” An AI architect drafted the room program, a layout solver placed every wall and door, and the plan was checked automatically for room sizes, circulation and daylight. The same project produced the PDF sheets, layered DXF, IFC model and 3D model you can download above.
Frequently asked questions
What drives the cost to build a tiny house like this?
Cost depends mainly on your location, labor rates, foundation type, finishes, and utility connections. A plain rectangle with one story and a simple roof reduces the framing complexity, but you should get local contractor quotes for a reliable figure.
Can I build this plan myself?
Experienced owner-builders may be able to, but requirements vary. Many jurisdictions require permits, inspections, and licensed trades for electrical, plumbing, and sometimes structural work. Check local zoning and building codes, including minimum size rules for dwellings, before you start.
How can I customize this plan with AI?
You can describe changes in plain language, such as moving the kitchen, resizing the bedroom, or adding a window, and the AI generates an updated layout. Review any changes against local codes, and have a qualified professional check the plan before construction.
Can I use the plan in CAD software with DXF files?
Yes. The DXF export opens in most CAD programs, so you can measure, annotate, and edit the layout. Check units and scale when you import, and confirm dimensions against the room sizes listed on this page.