State law permits ADUs up to 1,200 sqft for detached units. 5,000–8,000 sqft typical residential lots. Some lots range from 8,000–9,600+ sqft in hillside and coastal neighborhoods.
16 feet for single-story detached ADUs. Coastal view protection ordinances may further limit height and massing on certain properties.
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 transit, garage conversions, and other state-mandated conditions.
No owner-occupancy requirement (permanent per AB 976).
Estimated cost $275K–$425K. Permit fees $8K–$18K. Impact fees: Waived under 750 sqft.
San Clemente — the "Spanish Village by the Sea" — is the southernmost city in Orange County and one of the most architecturally distinctive. The city enforces mandatory Spanish Colonial Revival design review for all new construction, meaning your ADU must conform to Hispanic architectural principles including specific materials, finishes, roof tiles, stucco textures, and color palettes. Most of the city falls within the California Coastal Zone, requiring a Coastal Development Permit (CDP) for ADU projects. The combination of rigorous design requirements and coastal permitting makes San Clemente one of the more complex ADU markets in Orange County — but the premium coastal lifestyle, strong rental demand ($2,500–$4,000/mo), and unique architectural character create significant property value upside for those who navigate the process correctly.