ADU rules in South San Francisco, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
South San Francisco allows ADUs per California state law (SSFMC Title 20). Detached ADUs up to 1,200 sq ft max; minimum 800 sq ft and 16 ft allowed by right. 4-ft setbacks. ADUs cannot be STRs.
South San Francisco follows California Government Code §65852.2 for ADUs. Detached ADUs are limited to 1,200 sq ft maximum per state law, with a minimum of 800 sq ft and 16 feet allowed by right. JADUs limited to 500 sq ft within existing structures. Setbacks: 4 feet from rear and interior side property lines. No minimum lot size. Conversion ADUs and JADUs generally do not require parking; attached and detached new-construction ADUs require 1 space unless within 1/2 mile of transit. ADUs cannot be used as STRs under SSFMC §20.350.036. Owner-occupancy not required for ADUs permitted 2020–2025 per state law.
Unpermitted ADU construction subject to code enforcement and fines.
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Side-by-side rule comparisons with other cities in San Mateo County.
See how other cities in San Mateo County handle adu rules.
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