Where is a single-family home allowed in San Marino?

Find your lot's zone on the city zoning map, then read its row. Every status below was read from the San Marino Municipal Code use tables (read October 2026). Base zones only. General information, not legal advice — check with the city before you apply.

San Marino's code calls this use “New single-family dwelling”. Each row links to the use table it comes from. A zone marked “see note” has a condition in the code, for example upper floors only or a larger lot.

RM1, RIH, MU-1, MU-2.

• Row "Existing single-family dwelling" is P in RM1, RIH, MU-1, MU-2 (existing homes may stay). New single-family dwellings are not allowed in those four zones.
• State law: State law lets most single-family lots add an ADU and a JADU (California ADU law) and a second home or a lot split under SB 9 (Gov. Code § 65852.21).
• Not covered here: R-1 has a use list (S1), not a table; only the single-family dwelling is read from it; P&R (S2) and H&C (S3) have short use lists; C-1 Commercial Zone and any other commercial or area districts: no use table in the packet. Overlay zones and specific plans can also change the answer.

• Apartment building