Prefab / Modular ADU

Construction Corps is a veteran-owned design-build general contractor in Clearwater, FL building fully permitted ADUs across Pinellas County and Tampa Bay, with design, engineering, permitting, and construction handled by one in-house team.

McCain Homes offers prefab ADUs built with 90%+ recyclable modular wall systems, costing 20% less than traditional builds. Models range from 400 sq ft studios to larger series. Acquired by SwiftWall Solutions in 2020.

Great Lakes Tiny Home builds park model tiny homes, A-frames & compact dwellings for full-time living, vacation rentals, Airbnb, guest houses & backyard retreats. Models include the A-Frame Luxe, Grizzly, Aspen, Firefly & Trailblazer.<... 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.

OneBuild is a Hudson Valley ADU firm founded in 2025, managing full-scope projects including feasibility, permitting, design, prefab selection, and installation of backyard cottages, in-law suites, and granny flats.

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 acce... read more

Kellow Construction offers full-service ADU construction in Santa Barbara County, handling design, permitting, and building. Options include detached, attached, garage conversion, and Junior ADUs. Key regulations cover size limits, setbacks, parki... read more

WheelPad, a Vermont company, manufactures accessible modular dwelling units (PADs) for people with mobility challenges. Models include SuitePAD, StudioPAD, SuitePAD XL, and MultiPAD, all ADA-compliant with accessibility features like ceiling hoist... read more

Turnkey ADUs is a Leominster, MA ADU contractor offering modular, prefabricated accessory dwelling units across New England. Models range from $119K–$249,900. Massachusetts' 2024 Affordable Homes Act now allows ADUs up to 900 sq. ft. by right.read more

Meadow Ridge Cabin ADU Series by Amish Built Cabins LLC starts at $62,000. Certified modular cabins, 240–832 sq. ft., include full kitchen, laminate flooring, Ponderosa Pine interiors & delivery. Ideal ADU, guest suite, or rental solution.read more

Rainbow Valley Design And Construction in Eugene, OR specializes in ADUs, backyard cottages, and studios. They offer pre-designed and custom plans, plus remodels, new builds, and renovations for residential clients.

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

Red's Construction & Renovation serves Federal Way & South King County, WA, specializing in ADU construction including detached, attached, garage conversions & basement units. Costs range from $50K–$300K+. Licensed, insured, transpar... read more

Econstruct Inc is a Los Angeles ADU contractor offering full-service construction of accessory dwelling units. With 40+ pre-approved designs and 3D/AR tools via Ohana Dwellings, costs range from $200K–$450K+.

Knickerbocker Group's Predesigned Homes offer complete architectural plans with flexible customization. Choose from Homes, Cabins, Carriage Houses, or ADUs. Build off-the-shelf or fully custom—up to 30% faster than traditional builds.