Seal Beach · Land use · Duplex
Where is a duplex allowed in Seal Beach?
In Seal Beach, a duplex is allowed in 3 base zones (RMD, RHD and LC/RMD) and not allowed in 6 (Seal Beach use tables, read October 2026).
Key points
- Allowed: RMD, RHD and LC/RMD
- Not allowed: RLD, MCH-RHD, PO, MSSP, SC and GC
Find your lot's zone on the city zoning map, then read its row. Every status below was read from the Seal Beach 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
Seal Beach's code calls this use “Two-Unit Residential (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.
| Zone | Status | Code |
|---|---|---|
| RMD | Allowed | § 11.2.05.010 |
| RHD | Allowed | § 11.2.05.010 |
| LC/RMD | Allowed | § 11.2.10.010 |
Zones where it is not allowed
What else applies
- Not listed in PS, RG, LM, OE, OS-N, OS-PR.
- 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; SPR (Specific Plan Regulation) zone has no use table (S7); Cells for zones whose table does not list the use are left out. Overlay zones and specific plans can also change the answer.
Other uses in Seal Beach
Who this affects
Frequently asked questions
Can I have a duplex in the RLD zone in Seal Beach?
No. Seal Beach's use table does not allow it in RLD (§ 11.2.05.010).
Can I have a duplex in the RMD zone in Seal Beach?
Yes. Seal Beach's use table lists it as allowed in RMD (§ 11.2.05.010).
General information, not legal advice.
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