This compact yet stylish accessory dwelling unit (ADU) plan offers approximately 644 square feet of efficient living space with two bedrooms and one full bathroom, making it ideal for a backyard guest house, small rental unit, vacation retreat, or minimalist primary residence. Featuring a sleek modern exterior and a vaulted open-concept interior, this plan is designed for bright, flexible living in a smaller footprint. 0
Exterior Design
The exterior is contemporary in character with crisp horizontal siding, prominent black-framed windows and doors, and a contemporary single-slope roof that reinforces its modern aesthetic. Its compact profile fits comfortably on small lots or as a secondary dwelling adjacent to a primary residence. 1
Interior Layout Overview
Step inside to an open and inviting interior with a dramatic vaulted ceiling in the main living space that enhances the feeling of volume and light. This open-concept layout blends the living, dining, and kitchen areas for seamless everyday living and entertaining. 2
Main Living Area
Upon entry, the vaulted living area opens to abundant natural light from expansive windows and sliding glass doors that connect the interior to outdoor patio space — perfect for morning coffee or enjoying views of the surrounding landscape. The kitchen is integrated into this open environment, providing efficient workspace and a social focal point. 3
Bedrooms
This plan includes two comfortably sized bedrooms positioned for privacy. The primary bedroom offers a tranquil retreat and is enhanced by an 8-foot vaulted ceiling that complements the open living space. The second bedroom is flexible for guests, home office use, or shared living arrangements. 4
Bathroom
The full bathroom is conveniently located to serve both bedrooms and guests, with an efficient layout and direct access from the main living area. 5
Functional Features
- Open floor plan with vaulted ceiling: Enhances the sense of space and invites natural light deep into the interior. 6
- Two bedrooms: Provides flexible sleeping arrangements for family, guests, or multifamily use. 7
- Main-level laundry: Adds convenience and practical daily utility. 8
- Sliding glass doors to outdoor space: Expands living area and supports indoor–outdoor flow. 9
- Sleek modern exterior: Clean contemporary lines and materials make it a versatile design that fits various settings. 10
Dimensions and Structural Details
This ADU plan measures approximately 31 feet wide by 24 feet 6 inches deep with a maximum ridge height near 11 feet 10 inches. Standard foundation options include slab construction, and exterior walls are designed with energy-efficient 2×6 framing. Ceiling heights in the bedrooms are vaulted up to 8 feet, while the great room’s vaulted ceiling reaches 10 feet in height. 11
Estimated Building Cost (USD)
Estimated construction costs for a compact ADU like this can vary based on location, materials, finishes, and labor. A general moderate build quality estimate might range approximately between:
- Low estimate: ~ $77,280 (assuming ~$120 per sq ft × 644 sq ft)
- High estimate: ~ $115,920 (assuming ~$180 per sq ft × 644 sq ft)
These figures provide an approximate idea of what it might cost to build the sleek modern ADU, but actual costs will vary depending on regional construction markets and custom selections. 12
