Prefab / Modular ADU

Soul Builders SLC offers full-service ADU construction in Utah, handling design, permitting, zoning, and building. Services include detached ADUs, garage conversions, and basement apartments, tailored to each property's layout and budget.

Ataman Studio is a trusted ADU contractor in Los Angeles, serving all of California. Full-service design, permitting, and construction for detached ADUs, garage conversions, and in-law units, with compliance to local zoning and state regulations.<... read more

F&A Modular Homes builds custom modular ADUs, granny flats & backyard cottages. Units ship fully built or flat-packed, meet CA codes, & can be relocated. Builds in 3–6 weeks, cutting on-site labor by 70%. Founded to address veteran h... read more

Licensed ADU contractor and construction management firm for NYC homeowners. We handle eligibility, permitting, and the full build across Queens, Brooklyn, Staten Island, and the Bronx.

The Springfield by Superior ADUs is a 2-bed, 2-bath detached ADU with open-concept living, vaulted ceilings, mini-split HVAC, kitchen island, ample storage, and optional ethanol fireplace—ideal as a granny flat or in-law suite.

Backyard Unlimited, founded 2009 in Rocklin, CA, specializes in Amish-crafted sheds, gazebos, pergolas, and ADUs for Greater Sacramento homeowners. They handle full ADU design, permitting, and installation in-house, with no subcontractors.

Zume Builders, based in San Mateo, CA, specializes in custom homes, ADUs, and prefab construction across the Peninsula, serving Atherton, Palo Alto, Hillsborough & more.

New England Additions, backed by Sordan Construction, offers pre-designed ADU builds across 25+ Greater Boston communities. Specializing in in-law suites and detached ADUs, they streamline permitting, budgets, and timelines for Massachusetts homeo... read more

An Accessory Dwelling Unit (ADU), also known as a granny flat or in-law suite, is a self-contained living space that boosts property value by 20–30%, generates rental income, supports multigenerational living, and promotes environmental sustaina... read more

Boston Deck Builders offers ADU construction in Greater Boston, including detached, attached, and interior units. Services cover planning, permitting, and build. Costs range from $150K–$400K+. Prefab options available. Compliant with Massachuset... read more

Modtec Homes builds modern prefab ADUs—granny flats, rental units, home offices & guest suites. Up to 90% factory-built for faster timelines & fixed pricing. Models include 1-bed Haven & 2-bed Cornerstone. Energy-efficient, code-comp... read more

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 &... read more

Bay Area Home Remodelers builds ADUs in Daly City, San Francisco & San Jose. Services include garage conversions, granny flats, JADUs & detached units. Full project support from permits to completion.

New Frameworks builds prefab ADUs and small homes using natural, locally sourced Vermont materials. Their Casita models range from 314 to 1,200 sq ft, featuring high R-values, all-electric systems, and optional Passive House certification.