The BOSS Studio Plus is a 340 sq ft studio prefab ADU (accessory dwelling unit) built in California by BOSS Homes — a modern, code-ready backyard home ideal as a rental unit, guest house, home office, or independent living space for family. Its 12’ × 28’ footprint and 11’6” overall height create an open, comfortable studio layout, while precision-engineered light-gauge steel framing delivers exceptional structural strength and low-maintenance durability. The Studio Plus ships on standard pallets — no cranes or oversized transport — and most projects move from order to move-in in roughly 4 to 9 months.
Like every BOSS model, the Studio Plus is engineered to meet both the International Building Code (IBC) and California Building Code (CBC), so it is permittable as a backyard ADU or granny flat across California — including Los Angeles, San Diego, San José, and more. Explore the full prefab ADU guide or browse all 8 BOSS models.
Price does not include installation or permitting.
340 sq ft modern backyard studio ADU — perfect for guest living, rental income, or a private home office
Spacious 12’ × 28’ footprint with an 11’6” overall height for an open, comfortable layout
Precision-engineered light-gauge steel framing for long-lasting structural strength
Premium galvanized steel roof in corrugated or standing-seam profiles for superior weather protection
Energy-efficient PIR insulation — Roof R-28 and Walls R-42 (4” insulation)
Weatherproof interlocking wall panels with steel studs for maximum durability in any climate
Fire-safe construction with FM-approved Class 1 materials and self-extinguishing insulation
Modern black aluminum windows & doors with double-pane glass
Customizable window & door placement tailored to your design preferences
Standard interior package included — interior doors & hardware, cabinetry, finish flooring, paint, and electrical & plumbing fixtures
Mini-split A/C system included for year-round comfort
Meets International & California Building Codes for permitting confidence
Eco-friendly materials made with 35% recycled post-consumer content
