Basement Conversion

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 Massachusetts ADU regulations.

Suncoast Construction Inc. is a licensed ADU contractor in Oceanside, CA, building detached ADUs, garage conversions, JADUs & attached units per Oceanside's 2022 ADU Ordinance. No short-term rentals permitted.

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.

Cascadia ADU builds attached, detached, garage & basement ADUs across King, Snohomish, Skagit & Chelan Counties, WA. Full-service design, permitting & construction completed in 8–10 weeks with 10+ years experience.

An ADU (Accessory Dwelling Unit) is an independent living space on a single-family property, complete with kitchen, bathroom & private entrance. Types include detached units, garage conversions & basement apartments. Ideal for rental income or family housing.

Aldridge Construction builds ADUs in Salinas, CA—detached, attached, garage conversions & interior units. Projects cost $150K–$300K, take 4–8 months, and include full permitting support. Free consultations available.

Neil Kelly Washington offers ADU design and build services in the Northwest, including detached ADUs, garage conversions, and attached units. Their team navigates local permits, balances design with functionality, and helps homeowners add value through custom accessory dwelling units.

Branch Home Improvement LLC is a licensed, family-owned contractor in Holly Springs, NC, with 26+ years of experience. Specializing in ADU construction, kitchen remodeling, bathroom renovations, and home additions across the Research Triangle. A+ BBB rated.

Tell Projects builds ADUs in Houston, TX — detached cottages, garage conversions & in-law suites. 20+ years experience. Full permits, design & construction handled. Costs from $150–$300/sqft. Serving Sugar Land, Pearland & The Woodlands.

Vercammen Contracting offers expert ADU construction in Sarasota & Manatee Counties, FL. Services include garage conversions, detached ADUs & basement renovations. Family-owned, veteran-owned, 30 years experience, free quotes & 1-year warranty.

Ironstone Homes, Lancaster PA, specializes in ADU construction & multigenerational living spaces. Services include garage conversions, in-law suites, granny flats & backyard cottages. Custom builds with full permitting support since 2006.

Liebo Builders is a Southern California ADU contractor specializing in detached, attached, garage conversion & interior ADUs. Services include custom design, permitting, and construction for guest houses, rentals & home offices.

Bell Mountain Builders, based in Heber, Utah, offers custom home building, ADU construction, basement finishing, and commercial development. Family-owned with 40+ years experience, they handle detached ADUs, in-law suites, and backyard cottages with full regulatory compliance.

Home 360 Construction Inc. offers full-service ADU construction in San Diego, including detached, attached, and garage conversion units. They manage planning, permits, design, and inspections across San Diego County neighborhoods.

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.