This detached 3 bedroom ADU fits 1,150 sq ft of living space on one level, within a 41'-8" × 28'-10" footprint. A front porch opens into the living room at 12'-11" × 16'-2". The kitchen (11'-3" × 10'-4") and dining area (8'-10" × 10'-4") sit beside it, so cooking, meals and seating share one open zone.
A 20'-6" × 3'-7" hall leads to the sleeping wing. The primary bedroom (11'-1" × 12'-3") has its own 9'-0" × 5'-9" bath. Bedroom 2 (9'-0" × 10'-4") and Bedroom 3 (9'-5" × 10'-4") share the 9'-0" × 6'-2" hall bath. A 4'-9" × 7'-0" laundry room is off the circulation path, so machines stay out of the main living space. There is no garage.
Layout highlights
- Living room measures 12'-11" × 16'-2" and opens directly to the kitchen and dining area.
- Kitchen at 11'-3" × 10'-4" sits beside the 8'-10" × 10'-4" dining space.
- Primary bedroom is 11'-1" × 12'-3" with a private 9'-0" × 5'-9" bath.
- Bedrooms 2 and 3 share a 9'-0" × 6'-2" hall bath off a 20'-6" hall.
- Separate 4'-9" × 7'-0" laundry room and a front porch on a 41'-8" × 28'-10" footprint.
Room sizes
| Room | Size | Area |
|---|---|---|
| Laundry | 4'-9" × 7'-0" | 33 sq ft |
| Living Room | 12'-11" × 16'-2" | 210 sq ft |
| Primary Bedroom | 11'-1" × 12'-3" | 136 sq ft |
| Primary Bath | 9'-0" × 5'-9" | 51 sq ft |
| Hall Bath | 9'-0" × 6'-2" | 55 sq ft |
| Hall | 20'-6" × 3'-7" | 73 sq ft |
| Kitchen | 11'-3" × 10'-4" | 116 sq ft |
| Dining | 8'-10" × 10'-4" | 91 sq ft |
| Bedroom 3 | 9'-5" × 10'-4" | 97 sq ft |
| Bedroom 2 | 9'-0" × 10'-4" | 93 sq ft |
Who this plan suits
This plan suits families, multigenerational households or rental owners who want three bedrooms and two baths in a detached unit on a single level. It needs a rear lot with room for a 41'-8" × 28'-10" footprint plus setbacks, and access for utilities and a path to the porch.
How this plan was made
It was generated in AI Architectures Plan Studio from this one-line brief: “Detached 3 bedroom ADU on a rear lot: 3 bedrooms, 2 baths, open kitchen, dining and living, laundry, small porch, about 1,150 sq ft of living space.” 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 3 bedroom ADU plans?
3 bedroom ADU plans describe a secondary dwelling unit with three bedrooms, built on the same lot as a main house. This version is a detached single-level home with 1,150 sq ft of living space and two baths.
What affects lot fit and building cost for this plan?
The 41'-8" × 28'-10" footprint must fit within your setbacks, height limits and ADU size rules, which vary by city. Cost depends on local labor, foundation type, finishes and the length of utility connections from the main house or street.
Can I change this plan by chat?
Yes. You can describe changes in chat, such as resizing rooms, adding a garage on a chosen side or adjusting the layout for a narrower lot. The plan is then regenerated to reflect your request.
How do I use the PDF, DXF and IFC files?
The PDF is for review, permit discussions and sharing with contractors. The DXF opens in CAD software for drafting and site layout, and the IFC imports into BIM tools for coordination and modeling. Have a local licensed professional check the plans against your codes before permit submission.