ADU rules in Santa Monica, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Santa Monica regulates ADUs under SMMC §9.31.025. Maximum size is 650 sq ft on lots up to 6,000 sq ft or 800 sq ft on larger lots. No development fees. Ministerial approval process.
Under SMMC §9.31.025, ADUs and JADUs are allowed on any parcel zoned for residential use with an existing or proposed dwelling. Maximum size is 650 sq ft for lots up to 6,000 sq ft, or 800 sq ft for larger lots. The second story cannot exceed the first story area. Minimum 4-foot setbacks from rear and interior side property lines for new construction. No setbacks for conversions of existing structures. No development fees for ADUs or JADUs. Approval is ministerial (no public hearing). ADUs are exempt from parcel coverage and floor area calculations. Rentals must be 30+ days (no short-term rentals except as permitted under SMMC Chapter 6.20). Fire sprinklers not required if primary residence doesn't have them.
Unpermitted ADUs may face code enforcement action, fines, and orders to remove or bring into compliance. Rental violations may result in additional penalties.
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Side-by-side rule comparisons with other cities in Los Angeles County.
See how other cities in Los Angeles County handle adu rules.
See how Santa Monica's adu rules rules stack up against other locations.
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