Downey · Land use · Duplex
Where is a duplex allowed in Downey?
In Downey, a duplex is allowed in 1 base zone (R-2), needs a minor site plan review in 2 (R-3 and R-3-O, all with a condition) and not allowed in 1 (Downey use tables, read October 2026).
Key points
- Allowed: R-2
- Needs a permit: R-3 and R-3-O
- Not allowed: R-1
Find your lot's zone on the city zoning map, then read its row. Every status below was read from the Downey 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
Downey's code calls this use “Duplex dwellings”. 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.
| Zone | Status | Code |
|---|---|---|
| R-2 | Allowed | § 9312.06 |
| R-3 | Needs a minor site plan review — see note Note Notes and Exceptions: Requires Minor Site Plan Review subject to Section 9814 in the R-3 and R-3-O zones | § 9312.06 |
| R-3-O | Needs a minor site plan review — see note Note Notes and Exceptions: Requires Minor Site Plan Review subject to Section 9814 in the R-3 and R-3-O zones | § 9312.06 |
Zones where it is not allowed
R-1.
What else applies
- 'Two-unit development' (R-1 P, others NP; Section 9312.08(c) and 9965) restates state law SB 9 and was not used.
- 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: Specific Plan areas (referred to in the body-art note); Section 9418, 9422, 9430.04, 9430.06, 9814 text not in packet. Overlay zones and specific plans can also change the answer.
Other uses in Downey
Who this affects
Frequently asked questions
Can I have a duplex in the R-3 zone in Downey?
Only with a minor site plan review. Downey's use table lists it that way in R-3 (§ 9312.06). The code adds a condition: “Requires Minor Site Plan Review subject to Section 9814 in the R-3 and R-3-O zones”
Can I have a duplex in the R-1 zone in Downey?
No. Downey's use table does not allow it in R-1 (R-1 (all lot sizes)) (§ 9312.06).
Can I have a duplex in the R-2 zone in Downey?
Yes. Downey's use table lists it as allowed in R-2 (§ 9312.06).
General information, not legal advice.
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