400 sq ft 2-Car Garage Conversion Studio ADU
Exterior render: compact detached ADU with light horizontal siding, dark-framed windows, and a low-profile hip roof
Studio layout — Murphy bed, full bath, W/D, open living/dining, kitchen, and glass-door entry
Front & Rear Elevation
Left & Right Elevation
| ADU Type | Garage Conversion |
| Total Area | 400 sq ft |
| Footprint | 20' × 20' |
| Ceiling Height | 9 ft |
| Roofline | Gable Roof |
| Exterior Cladding | Horizontal Lap Siding |
| Porch | No |
| Laundry | In-unit W/D |
Estimated build costs vary by location, contractor, and finish level. See our ADU Cost Guide for a full breakdown of what drives ADU construction costs in your state.
This 400 sq ft studio converts a standard two-car garage into a fully functional living unit using the existing footprint. The original garage opening becomes a wall of sliding glass doors, adding natural light and creating a strong indoor-outdoor connection, while the Murphy bed keeps the living area open during the day. A full kitchen, in-unit washer/dryer, and complete bath make this plan appropriate for long-term rental or multigenerational use without adding any new square footage to the property.
At 20' × 20', this plan works within the shell of a standard two-car garage without adding to the existing structure. The gable roof is retained as-is, keeping the exterior profile familiar to the neighborhood, while the full-width sliding glass doors give the converted space a character that reads as intentional rather than improvised.
Download the Free Plan Sheet
Get a clean one-page PDF with the floor plan, exterior render, and key specs — formatted and ready to share with your contractor or architect.
What's in the Free PDF Download