This detached, single-level ADU has 620 sq ft of living space on a 36'-1" × 20'-0" footprint, with one bedroom and one bathroom. The living room (13'-7" × 11'-6") and the kitchen (11'-1" × 7'-4") make up the open main area, so cooking, dining and sitting share one connected space. A hall of 11'-1" × 3'-9" links this area to the private rooms.
The bedroom measures 8'-8" × 12'-3" and has its own walk-in closet at 6'-8" × 5'-5". The bathroom (5'-6" × 5'-5") and the laundry room (6'-0" × 5'-5") are compact and share the same depth, which keeps plumbing runs short. A covered patio extends the living space outdoors. There is no garage, so the full footprint goes to living area.
Layout highlights
- Open kitchen (11'-1" × 7'-4") and living room (13'-7" × 11'-6") form one main space.
- Bedroom at 8'-8" × 12'-3" with a separate 6'-8" × 5'-5" walk-in closet.
- Full bathroom at 5'-6" × 5'-5" sits off the 11'-1" × 3'-9" hall.
- Dedicated 6'-0" × 5'-5" laundry room avoids shared or off-site laundry.
- Compact 36'-1" × 20'-0" single-level footprint with a covered patio.
Room sizes
| Room | Size | Area |
|---|---|---|
| Bedroom | 8'-8" × 12'-3" | 106 sq ft |
| Kitchen | 11'-1" × 7'-4" | 81 sq ft |
| Hall | 11'-1" × 3'-9" | 41 sq ft |
| Living Room | 13'-7" × 11'-6" | 156 sq ft |
| Walk-in Closet | 6'-8" × 5'-5" | 36 sq ft |
| Bathroom | 5'-6" × 5'-5" | 30 sq ft |
| Laundry | 6'-0" × 5'-5" | 32 sq ft |
Who this plan suits
This plan suits homeowners adding a rental unit, guest house or space for a family member behind an existing house. It needs a backyard lot with room for a 36'-1" × 20'-0" footprint plus setbacks and a path to utilities.
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 650 sq ft of living space: 1 bedroom, 1 bath, walk-in closet, open kitchen and living, laundry, covered 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 are 650 sq ft ADU plans?
They are plans for an accessory dwelling unit of roughly that size, built on the same lot as a main house. This version is a detached one-bedroom, one-bath unit with 620 sq ft of measured living space, a full kitchen, laundry and a covered patio.
What affects the lot fit and cost of this ADU?
The 36'-1" × 20'-0" footprint must fit within your local setbacks, height limits and lot coverage rules. Cost depends mainly on foundation type, utility connection distances to the main house, finishes and local permit requirements, so check these with your jurisdiction before building.
Can I change this plan by chat?
Yes. You can describe changes in chat, such as resizing or moving rooms, adding a garage or switching its side, or adjusting the layout for a narrower or wider lot. The plan is regenerated with updated room sizes and footprint.
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 drafting and site layout, and the IFC imports into BIM tools for modeling. Have a local licensed professional verify the plans against your codes before construction.