Prefab / Modular ADU

Wellmade is a California prefab ADU builder specializing in panelized accessory dwelling units. Founded in 2020, they've completed 200+ projects, reducing construction waste by 85%. Serving CA, OR, and WA with all-inclusive pricing.

LiveLarge Home is a California prefab ADU builder offering full-service solutions from permits to final inspection. Build times start at 4–6 weeks, with fixed pricing from $412/sq. ft. Models range from studios to 2-bed/2-bath units with premium... read more

Roof and Realm is a California-based steel-framed modular home and ADU builder offering fire, earthquake, and wind-resistant structures. Their eco-friendly builds use 98% recyclable materials, generate minimal waste, and support solar-ready, Net P... read more

Boxabl's Casita is a factory-built ADU available as a studio, one- or two-bedroom unit. Fully equipped with kitchen, bath, and HVAC, it's delivered and installed turnkey—ideal as a granny flat, in-law suite, or rental.

Wind River Built offers a structured ADU process: inquiry, model selection, detailed quoting, purchase agreement, factory build with weekly photo updates, and final on-site assembly—ensuring quality, transparency, and client confidence throughou... read more

Canbury Homes is a Maine-based modular ADU builder offering diverse floor plans like Columbia II, Clinton, Cameron, and more. They guide homeowners through Maine's ADU regulations, providing customizable, affordable accessory dwelling units.

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.

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.

Irontown Modular builds prefab ADUs in Southern California starting at $155,000. They manage planning, permitting, factory fabrication & installation. Park Model ADUs start at $145,000. Free site review available.

The Home Boys is Washington State's largest manufactured home dealer, offering factory-direct pricing across WA, ID, OR, MT, and AK. They carry brands like Goldenwest, Marlette, Clayton, and Cavco, plus ADU-friendly park models under 1,200 sq ft.<... read more

B&B Tiny Houses in Adams, MA offers modular ADUs starting at $99,000. Customizable, code-compliant units serve as in-law suites or rental spaces. Delivered across the US East region, with bulk discounts for 5+ orders.

Nomad Tiny Homes, a veteran-owned, NOAH-certified builder in Dripping Springs, TX, offers fully finished ADUs and backyard cottages from 16-40 feet. Models start at $95,000, with 10-12 week build times and nationwide delivery.

Post and Beam Barns (Country Carpenters, Hebron CT) offers handcrafted post and beam kits ideal for ADUs, backyard cottages & in-law suites. With 50+ years experience, models include The Sterling, Hemingway & Barrett. Timeline: 4–12 mont... read more

Affordable Portable Housing Hawaii is a design-build company specializing in shipping container homes, offices, and structures. They offer drafting, permits, and full project development with financing options available.

Alchemy Architects, founded in 1992 in Saint Paul, MN, specializes in prefab homes, ADUs, and the weeHouse system. Their LightHouse line offers backyard cottages and granny flats, with 60+ projects completed across the US.