Antioch · Land use · Duplex
Where is a duplex allowed in Antioch?
In Antioch, a duplex is allowed in 4 base zones (R-10, R-20, R-25 and R-35), needs an use permit in 1 (MCR) and not allowed in 13 (Antioch use tables, read October 2026).
Key points
- Allowed: R-10, R-20, R-25 and R-35
- Needs a permit: MCR
- Not allowed: RE, RR, R-4, R-6, PBC, C-0, C-1, C-2 and 5 more
Find your lot's zone on the city zoning map, then read its row. Every status below was read from the Antioch Municipal Code use tables (read October 2026). Base zones only. General information, not legal advice — check with the city before you apply.
Zones where a duplex can go
Antioch's code calls this use “Two-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.
Zones where it is not allowed
What else applies
- 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: PD, HPD, MUMF, P (Exclusive Parking), S (Study) and SP (Specific Plan) districts: not columns of the § 9-5.3803 table; Definitions article (Senior Group Housing, Residential care facility) not in the packet. Overlay zones and specific plans can also change the answer.
Other uses in Antioch
Who this affects
Frequently asked questions
Can I have a duplex in the MCR zone in Antioch?
Only with an use permit. Antioch's use table lists it that way in MCR (Mixed Commercial/Residential District) (Article 38 — LAND USE REGULATIONS).
Can I have a duplex in the RE zone in Antioch?
No. Antioch's use table does not allow it in RE (Rural Estate District) (Article 38 — LAND USE REGULATIONS).
Can I have a duplex in the R-10 zone in Antioch?
Yes. Antioch's use table lists it as allowed in R-10 (Medium Density Residential District) (Article 38 — LAND USE REGULATIONS).
General information, not legal advice.
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