Prefab / Modular ADU

Carbide Construction offers modular additions, ADUs, in-law suites, and ADA-compliant builds in Northern Virginia. Since 2002, they manage design to installation, working with top manufacturers for custom, eco-friendly prefab home solutions.

Alpine Forge builds precision ADUs and tiny homes in Nampa, Idaho. Using a panelized method, they offer faster timelines, cost predictability, and energy-efficient designs for rental units, guest houses, in-law suites, and backyard cottages.

Timberhaven's Evergreen ADU Modern Escape is a 440 sq ft log-built accessory dwelling unit featuring walls of glass, a shed roof, and Andersen windows. Ideal as a guest house or granny flat with a Lifetime Warranty on engineered logs.

Westchester Modular Homes Inc. builds modular accessory dwelling units (ADUs) in the Northeast. ADUs are secondary homes on single-family lots requiring permits, a kitchen, bathroom, and private entrance. ADUs can boost property value.

Mighty Small Homes offers prefab ADU kits with 6 customizable models for granny flats, in-law suites, home offices & rentals. Benefits include 60% energy savings, faster builds & superior strength.

Monarch Architecture in Columbia, MO specializes in ADU design. Founder Adrienne Stolwyk advocated for ADU-friendly zoning via ECHO. In 2023, they built Columbia's first permitted straw bale ADU. Services include backyard cottages, in-law suites, and garage conversions.

Coastal Haven is a Tampa ADU contractor handling zoning, permits, design, and construction. They build garage conversions, backyard cottages, and detached ADUs within approved overlays, ensuring full Florida Building Code compliance.

Fabmac Homes builds custom manufactured homes on Maui with 20+ years experience. Factory-built at Clayton Homes, shipped to Maui in 6–8 months. Features include hurricane-rated construction, energy efficiency, and permanent foundations. Ideal for ADUs, granny flats, or in-law suites.

Joy Line Homes offers the ADURA ADU Series — factory-built backyard cottages and granny flats featuring modern design, high-end finishes, and durable materials. An affordable, plan-based ADU solution for homeowners seeking quality detached accessory dwelling units.

Nestadu is a full-service ADU builder offering custom site-built and prefab accessory dwelling units. Prefab models range from $115K–$317K. Custom builds start at $400/sq ft. Financing options include HELOCs, construction loans, and CA grants.

Sacramento's Summit Building Group offers full-service ADU construction, including custom design, permitting, garage conversions, and detached units. They serve homeowners seeking rental income, multigenerational living, or guest suites, backed by a lifetime workmanship warranty.

Mountain West Modulars sells tiny homes & modular cottages from brands like Platinum Cottages, Cavco, Champion, and Woodland Park. They offer 40+ models suited for primary residences, ADUs, granny flats, and backyard cottages.

EHD Builders offers ADU construction services in Los Angeles, CA, including garage conversions, detached units & additions. Costs range from $150K–$350K+. Services cover permits, framing, plumbing, electrical & more.