This 1100 sq ft ADU plan is a single-level, detached backyard unit with 1,090 sq ft of living space inside a 31'-2" × 37'-1" footprint. It has three bedrooms, two baths, a laundry room and a porch at the entry.
The kitchen (8'-4" × 13'-3"), dining area (12'-3" × 6'-8") and living room (20'-6" × 10'-8") form one open main space, so cooking, eating and sitting share sightlines. A hall (7'-6" × 9'-9") links that space to the bedrooms and bathrooms. The primary bedroom (12'-7" × 10'-0") has its own ensuite (6'-4" × 5'-10"). Bedrooms 2 and 3 measure 8'-4" × 10'-9" and 8'-4" × 10'-4", and share the hall bathroom (7'-6" × 6'-0"). The laundry room is 5'-10" × 5'-10".
Layout highlights
- Open kitchen, dining and living area, with a 20'-6" × 10'-8" living room.
- Primary bedroom of 12'-7" × 10'-0" with a private 6'-4" × 5'-10" ensuite.
- Two secondary bedrooms, each 8'-4" wide, at 10'-9" and 10'-4" deep.
- Separate 5'-10" × 5'-10" laundry room and a 7'-6" × 6'-0" hall bathroom.
- Single level, 1,090 sq ft of living space, on a 31'-2" × 37'-1" footprint.
Room sizes
| Room | Size | Area |
|---|---|---|
| Dining | 12'-3" × 6'-8" | 82 sq ft |
| Living Room | 20'-6" × 10'-8" | 218 sq ft |
| Ensuite | 6'-4" × 5'-10" | 37 sq ft |
| Laundry | 5'-10" × 5'-10" | 34 sq ft |
| Primary Bedroom | 12'-7" × 10'-0" | 126 sq ft |
| Hall | 7'-6" × 9'-9" | 73 sq ft |
| Bathroom | 7'-6" × 6'-0" | 45 sq ft |
| Kitchen | 8'-4" × 13'-3" | 110 sq ft |
| Bedroom 2 | 8'-4" × 10'-9" | 90 sq ft |
| Bedroom 3 | 8'-4" × 10'-4" | 86 sq ft |
Who this plan suits
This plan suits homeowners who want a three-bedroom rental, guest house or multigenerational unit in the backyard. It needs a lot with room for a 31'-2" × 37'-1" footprint plus the setbacks your city requires.
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 1100 sq ft of living space: 3 bedrooms, 2 baths, open kitchen, dining and living, laundry, porch.” 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 1100 sq ft ADU plans?
They are plans for an accessory dwelling unit of about 1,100 sq ft that sits on the same lot as a main house. This version has 1,090 sq ft of living space on one level, with three bedrooms and two baths. It is detached, so it stands as its own small building in the backyard.
What affects the lot fit and cost of building this ADU?
The 31'-2" × 37'-1" footprint has to fit within your local setbacks, height limits and ADU size rules, which vary by city. Cost depends on your site, utility connections, foundation type, finishes and local labor. Check with your planning department before you finalize the layout.
Can I change this ADU plan by chat?
Yes. You can describe changes in chat, such as moving or resizing rooms, changing the number of bedrooms, or adjusting the footprint for a narrower or wider lot. The plan is then regenerated with the new dimensions.
How do I use the PDF, DXF and IFC files?
The PDF is for reading and sharing the drawings with a contractor or your permit office. The DXF opens in CAD software for editing and measuring. The IFC is a BIM model that you can import into tools such as Revit or ArchiCAD. Have a licensed professional review the files before you submit for permits.