ADU Costs, Rent & ROI Across LA Los Angeles ADU construction ranges from roughly $150–$400 per square foot depending on type, location, and finish, translating to total project costs between approximately $90,000 and $400,000+ for typical 600–1,000 sq ft units. Monthly rents across the city span $1,500–$4,200 depending on neighborhood—West LA and Santa Monica command $2,800–$4,200 per month, while San Fernando Valley units rent for $2,000–$3,200 , and East LA sits around

ADUs are the hottest residential investment in 2025 California. Rental income: $1,800–$2,800/month; property value increase: 9.34% annually (2013–2023 FHFA data). New 2025 laws simplify permits: 60-day approval, reduced setbacks, pre-approved designs available. Typical ROI: 65–100% over 6–8 years. This guide covers costs ($100,000–$200,000+), LADBS/CALTECH permits, energy codes, and step-by-step approval for LA, Orange County, San Diego, and beyond.