Where is a duplex allowed in Orange County?

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

Orange County's code calls this use “Duplex”. 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.

• Note 10 says affordable housing development is subject to an Affordable Housing Permit (7-9-124.3).
• State law: SB 9 (Gov. Code § 65852.21) allows two homes on most single-family lots with a ministerial permit, also where this table says no.
• Not covered here: Zone names are not stated in the packet (only the group titles: Agriculture and Open Space, Single-Family Residential, Multifamily Residential, Commercial, Employment); Single-family district table (S3) is missing the Single-Family Dwelling, Duplex, Supportive/Transitional Housing and Short-Term Rentals rows in the stored text; SG (sand and gravel), the mixed-use district (7-9-36) and the FP-1/FP-2/FP-3 flood plain overlays (S7-S13) have no use table in the packet. Overlay zones and specific plans can also change the answer.

• Apartment building
• Rooming or boarding house
• Child care center
• Church or place of worship
• Community garden
• Growing crops