State law permits ADUs up to 1,200 sqft for detached units. 6,000–9,000 sqft typical. Beachfront lots are smaller (3,000–5,000 sqft). Inland neighborhoods like Goldenwest and Edwards Hill have lots up to 10,000+ sqft.
16 feet for single-story detached ADUs. State law allows up to 25 feet for qualifying two-story ADUs in residential zones. Check specific plan area overlays for additional height restrictions.
4-foot minimum from rear and interior side property lines for detached ADUs. Front and street-side setbacks follow the underlying zone requirements. Properties in specific plan areas (e.g., Holly-Seacliff, Bolsa Chica) may have additional setback guidelines.
No additional parking required near transit. Huntington Beach has additional parking sensitivity — particularly in beach-adjacent neighborhoods where street parking is already competitive. Inland properties near OCTA routes qualify for parking exemptions.
No owner-occupancy requirement (permanent per AB 976).
Estimated cost $250K–$425K. Permit fees $5K–$14K. Impact fees: Waived under 750 sqft.
Huntington Beach — "Surf City USA" — is the largest beach city in Orange County with over 200,000 residents and 9.5 miles of coastline. The city spans from beachfront neighborhoods near Pacific Coast Highway to larger inland lots in areas like Huntington Harbour, Goldenwest, and Edwards Hill. Inland lots are significantly larger (6,000–9,000+ sqft) and ideal for detached ADUs, while smaller beach-adjacent lots are better suited for garage conversions or attached units. Huntington Beach's tourism economy, beach lifestyle, and proximity to major employers create year-round rental demand. The city has additional scrutiny around parking and setbacks compared to some Orange County cities, making experienced guidance important.