Prefab / Modular ADU

Seattle Backyard Homes builds expert ADUs, DADUs, garage conversions & backyard cottages in Seattle and Bellevue. Full-service ADU contractors handling design, permits, zoning & construction with quality craftsmanship and transparent pricing.

Specialist ADU builder constructing durable, eco-friendly homes from repurposed shipping containers. Hurricane, earthquake & tornado resistant, IBC-compliant. Models range from 208–1760 sq ft. Custom designs available for backyard cottages & granny flats.

Small House Solutions is Houston's premier ADU and tiny home builder, offering custom homes, granny flats, backyard cottages, and tiny home communities. Services include permitting, design, construction, and full turnkey development across Houston and surrounding areas.

ADU Building Systems LLC builds factory & site-built ADUs in Massachusetts, including detached, attached & converted units. Offering 10-year structural warranties, cost savings up to 50%, and full-service design to turnkey construction.

Expert ADU builders serving Massachusetts homeowners. Services include detached ADUs, garage conversions, basement units & in-law suites. Fully permitted, code-compliant builds. Costs from $80K. Serving Boston, Cambridge, Worcester & statewide.

Build your ADU with ease using a simple 3-step process: choose a pre-designed model, customize finishes, and let expert contractors handle permits to move-in. Ideal for granny flats, backyard cottages & in-law suites.

Georgia ADU is Atlanta's top accessory dwelling unit builder, offering end-to-end ADU construction. Services include detached ADUs, garage conversions, in-law suites & more. Projects start at $150,000, with timelines of 4–9 months.

Lake Travis Tiny Home & ADU Builder specializes in high-quality accessory dwelling units, backyard cottages, and in-law suites. They offer transparent pricing, efficient timelines, sustainable materials, and expert zoning guidance throughout the Lake Travis area.

Inspired ADUs is an architect-led ADU design firm serving the Bay Area and Southern California. With 20+ years of experience and 250+ ADUs permitted, they offer custom, panelized, and modular ADU solutions, plus interior design and SB9 lot split services.

ExpandADU is a California-based prefab ADU builder offering full-service accessory dwelling unit construction, including consultation, design, planning, and build. Serving the Bay Area and beyond, they specialize in detached ADUs, granny flats, and JADUs.

Crest Backyard Homes is San Diego's trusted ADU builder, specializing in prefab, detached ADUs, granny flats & garage conversions. Their all-inclusive team guides homeowners from design to completion, ensuring code-compliant, high-quality accessory dwelling units.

Nestadu is a full-service ADU builder offering custom site-built and prefab ADUs. Site-built units start at $400/sqft; prefab models from $115K. They handle design, permitting, and construction, plus financing guidance including HELOCs and grants.

California ADUs (granny flats) add rental income or family housing to existing lots. Detached units up to 1,200 sq ft are allowed. Building costs start at $1,200/sq ft. Hire a specialized ADU contractor in San Diego for permits and zoning compliance.