State law permits ADUs up to 1,200 sqft for detached units. 7,000–10,000 sqft typical residential lots. No minimum lot size required by state law to build an ADU.
Up to 16 feet for single-story detached ADUs. Up to 25 feet for two-story ADUs in certain residential zones. An additional 2 feet may be permitted to accommodate roof pitch on lots with multi-family dwellings.
4-foot minimum from rear and side property lines for new detached ADUs. Conversions of existing structures are exempt from setback requirements.
No additional parking required if within 0.5 miles of public transit, or if the ADU is a conversion of existing space. Otherwise, one space per ADU may be required — can be tandem or in the driveway.
No owner-occupancy requirement for ADUs (eliminated 2020, made permanent by AB 976 in 2025).
Estimated cost $250K–$400K. Permit fees $5K–$12K. Impact fees: Waived under 750 sqft.
Anaheim is the second-largest city in Orange County by land area, with over 350,000 residents. Known for the Disneyland Resort, Angel Stadium, and Honda Center, Anaheim has a diverse real estate market with lot sizes that are significantly larger than many neighboring cities. The city eliminated its owner-occupancy requirement in 2020, making Anaheim one of the most investor-friendly cities in Orange County for ADU construction. Its proximity to major employment centers and tourism hubs drives consistent rental demand.