This detached, single-story backyard ADU has 460 sq ft of living space on a compact 23'-11" × 21'-0" footprint. A covered entry opens to the main living area. The 9'-6" × 10'-11" living room sits beside a 10'-4" × 7'-8" kitchen, so cooking and seating share one open zone.
A short 3'-7" × 6'-8" hall separates the open living area from the private rooms. It leads to the 11'-3" × 8'-4" bedroom and a 7'-4" × 6'-8" bathroom that includes the laundry closet, which keeps plumbing in one compact core. There is no garage and every room is on one level. The plan works as a guest suite, a rental unit or a home office behind a main house.
Layout highlights
- 460 sq ft of living space on one level within a 23'-11" × 21'-0" footprint.
- Living room measures 9'-6" × 10'-11" and opens directly to the kitchen.
- Kitchen is 10'-4" × 7'-8", sized for a full run of cabinets and appliances.
- Bedroom is 11'-3" × 8'-4", reached through a 3'-7" × 6'-8" hall.
- Bath and laundry closet share a 7'-4" × 6'-8" room, which keeps plumbing together.
Room sizes
| Room | Size | Area |
|---|---|---|
| Bath + Laundry Closet | 7'-4" × 6'-8" | 49 sq ft |
| Hall | 3'-7" × 6'-8" | 24 sq ft |
| Bedroom | 11'-3" × 8'-4" | 94 sq ft |
| Living | 9'-6" × 10'-11" | 104 sq ft |
| Kitchen | 10'-4" × 7'-8" | 79 sq ft |
Who this plan suits
This plan suits homeowners who want a one-bedroom guest suite, rental or office in the backyard without a garage. It needs a lot with room for a 23'-11" × 21'-0" footprint plus the setbacks and utility access your local rules require.
How this plan was made
It was generated in AI Architectures Plan Studio from this one-line brief: “Detached backyard ADU (accessory dwelling unit) with about 450 sq ft of living space: 1 bedroom, 1 bath, open kitchen and living, laundry closet, covered entry.” 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 are 450 sq ft ADU plans?
They are plans for an accessory dwelling unit of roughly this size, built as a separate small home on the same lot as a main house. This version has 460 sq ft of living space with one bedroom, one bath, a kitchen, a living area and a laundry closet.
What affects the lot and building cost for this ADU?
Setbacks, utility connections to the main house, foundation type and local permit requirements usually have the largest effect. The compact 23'-11" × 21'-0" footprint and a single plumbing core can help limit the amount of site and plumbing work. Get a local quote for actual costs.
Can I change this plan by chat?
Yes. You can ask for changes in chat, such as moving or resizing rooms, adding a garage or carport on a chosen side, or fitting the plan to a narrower or wider lot. The layout is regenerated so the rooms still connect.
How do I use the PDF, DXF and IFC files?
The PDF is for review, sharing and permit discussions. The DXF opens in CAD software for editing the 2D drawings, and the IFC imports into BIM tools for 3D work. A local designer or engineer should check the plan against your local code before you submit it.