Built ADU focuses on manufactured homes — HUD-approved factory-built units installed on permanent foundations and registered as real property via Form 433A. They hold both a B General Contractor license and a C-47 Manufactured Housing Contractor license, which is the specific classification required for this type of work. That dual license is a meaningful differentiator. They serve homeowners, developers, REITs, cities, counties, and nonprofits. Featured in International Business Times. Cost range is $200–$300/sq ft all-in. Typical project completes in 4–8 months. Open 7 days a week. 20+ years in the business.