Can I build an ADU in San Francisco?
Answered by AskBaily Editorial · Updated
Short answer
Yes. SF allows ADUs in all residential zones under both state ADU law (Gov Code §65852.2) and SF's local ADU program. Common configurations: garage conversion, basement/ground-floor addition, detached backyard cottage, or addition atop an existing structure. SB 9 lot splits are limited in SF because most SF parcels do not qualify under the single-family-zoning trigger. Typical ADU permit timeline: 4-10 months.
In detail
Yes. SF allows ADUs in all residential zones under both state ADU law (Gov Code §65852.2) and SF's local ADU program. Common configurations: garage conversion, basement/ground-floor addition, detached backyard cottage, or addition atop an existing structure. SB 9 lot splits are limited in SF because most SF parcels do not qualify under the single-family-zoning trigger. Typical ADU permit timeline: 4-10 months.
This answer is part of AskBaily's sf regulatory knowledge base. For deeper context — including current code-section references, agency contact details, and recent policy changes — see the [sf city hub](/sf) or [the /ask hub](/ask) for related questions.
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