700 sq ft 1-Bedroom + Den Detached ADU
Exterior render: modern detached ADU with blue horizontal siding, a flat roof, and a wide covered front porch.
1-bedroom + den layout: private bedroom, office/den, full bath, open living/dining, kitchen, and covered front porch
Front & Rear Elevation
Left & Right Elevation
| ADU Type | Detached 1-bedroom + den |
| Total Area | 700 sq ft |
| Footprint | 28' × 25' |
| Ceiling Height | 9 ft |
| Roofline | Flat Roof |
| Exterior Cladding | Horizontal Lap Siding |
| Porch | YesCovered Front Entry |
| Laundry | No |
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 700 sq ft ADU combines a separate bedroom with an additional den, providing more flexibility than a conventional one-bedroom layout. The den can serve as a home office, hobby area, reading space, or additional sitting room, depending on changing household needs. A full bathroom and covered front porch round out the design, adding practical convenience and a place to enjoy the outdoors.
At 28' × 25', this plan offers a rectangular footprint with room for both private and shared spaces. The flat roof gives the exterior a modern architectural character, while the additional den makes this layout especially adaptable.
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