State law permits ADUs up to 1,200 sqft for detached units. 5,000–7,000 sqft typical residential lots. Some R-1 zones have larger lots ranging from 11,000–15,000 sqft, providing ample space for detached ADUs.
16 feet for single-story detached ADUs. Up to 17 feet may be permitted to accommodate roof pitch on certain lot configurations.
4-foot minimum from rear and side property lines for new detached ADUs. Conversions of existing structures are exempt from setback requirements.
One parking space per ADU required. Exemptions available for properties within 0.5 miles of public transit, garage conversions, and other state-mandated conditions.
No owner-occupancy requirement (permanent per AB 976).
Estimated cost $225K–$375K. Permit fees $5K–$10K. Impact fees: Waived under 750 sqft.
Garden Grove is one of the most affordable cities in Orange County for ADU investment, with a population of over 170,000 residents. The city launched its "ADU Go" pre-approved program, offering homeowners a streamlined path to ADU construction with pre-reviewed plans that significantly reduce permitting time. Garden Grove maintains low vacancy rates of approximately 5%, driven by strong blue-collar rental demand and diverse neighborhoods including Midway City and West Garden Grove. Its proximity to Disneyland employment and the broader Anaheim tourism economy provides a steady pipeline of renters seeking affordable housing options in a county where median rents continue to climb.