Lancaster · Land use · Duplex
Where is a duplex allowed in Lancaster?
In Lancaster, a duplex is allowed in 1 base zone (MU-N), needs a director's review in 8 (RR-2.5, RR-1, SRR, R-15,000, R-10,000 and 3 more) and not allowed in 1 (Lancaster use tables, read October 2026).
Key points
- Allowed: MU-N
- Needs a permit: RR-2.5, RR-1, SRR, R-15,000, R-10,000, R-7,000, MDR and HDR
- Not allowed: MU-E
Find your lot's zone on the city zoning map, then read its row. Every status below was read from the Lancaster 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
Lancaster's code calls this use “Duplex (residential); Detached single-family unit or duplex (mixed use)”. 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 |
|---|---|---|
| MU-N | Allowed | § 17.10.050 |
| RR-2.5 | Needs a director's review | § 17.08.050 |
| RR-1 | Needs a director's review | § 17.08.050 |
| SRR | Needs a director's review | § 17.08.050 |
| R-15,000 | Needs a director's review | § 17.08.050 |
| R-10,000 | Needs a director's review | § 17.08.050 |
| R-7,000 | Needs a director's review | § 17.08.050 |
| MDR | Needs a director's review | § 17.08.050 |
| HDR | Needs a director's review | § 17.08.050 |
Zones where it is not allowed
MU-E.
What else applies
- "Two-unit projects (Subject to Chapter 17.41, Article III)" is a separate row, D in all residential zones (state two-unit rule; not used for cells).
- 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: H (Hospital), P, S, O, Pk, Ce, SP, MHP zones (their use lists are not matrices of these uses); In residential matrix the cell covers a group of zones: RR-2.5/RR-1/SRR, R-15,000/R-10,000/R-7,000, MDR/HDR; each zone in the group gets that cell. Overlay zones and specific plans can also change the answer.
Other uses in Lancaster
Who this affects
Frequently asked questions
Can I have a duplex in the RR-2.5 zone in Lancaster?
Only with a director's review. Lancaster's use table lists it that way in RR-2.5 (§ 17.08.050).
Can I have a duplex in the MU-E zone in Lancaster?
No. Lancaster's use table does not allow it in MU-E (§ 17.10.050).
Can I have a duplex in the MU-N zone in Lancaster?
Yes. Lancaster's use table lists it as allowed in MU-N (§ 17.10.050).
General information, not legal advice.
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