Thousand Oaks · Land use · Duplex
Where is a duplex allowed in Thousand Oaks?
In Thousand Oaks, a duplex is needs a permit in 4 (R-2, R-3, RPD and HPD) and not allowed in 7 (Thousand Oaks use tables, read October 2026).
Key points
- Needs a permit: R-2, R-3, RPD and HPD
- Not allowed: R-A, R-E, R-O, R-1, RPD-SFD, HPD-SFD and TPD
Find your lot's zone on the city zoning map, then read its row. Every status below was read from the Thousand Oaks 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
Thousand Oaks's code calls this use “Two-family 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 Two-Family Residential | Needs a precise plan of design permit | Article 21 — Uses Allowed by Zone |
| R-3 Multiple-Family Residential | Needs a residential planned development permit | Article 21 — Uses Allowed by Zone |
| RPD Residential Planned Development | Needs a residential planned development permit | Article 21 — Uses Allowed by Zone |
| HPD Hillside Planned Development | Needs a hillside planned development permit | Article 21 — Uses Allowed by Zone |
Zones where it is not allowed
What else applies
- Standards for this use: Sec. 9-4.2106(h): in R-A, R-E, R-O and R-1 one single-family dwelling per lot; in R-2 either two single-family dwellings or a duplex per lot; in R-3 any housing type, max 30 dwelling units per net acre; in R-P-D any housing type, density by subzone; in R-P-D-SFD only single-family dwellings..
- 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: R-1 zone chapter (single-family residential) and the R-P-D-SFD / H-P-D-SFD chapters are not in the packet except through the matrices; Specific plan areas (Sec. 9-4.2102) govern their own uses. Overlay zones and specific plans can also change the answer.
Other uses in Thousand Oaks
Who this affects
Frequently asked questions
Can I have a duplex in the R-2 zone in Thousand Oaks?
Only with a precise plan of design permit. Thousand Oaks's use table lists it that way in R-2 (Two-Family Residential) (Article 21 — Uses Allowed by Zone).
Can I have a duplex in the R-A zone in Thousand Oaks?
No. Thousand Oaks's use table does not allow it in R-A (Rural-Agricultural) (Article 21 — Uses Allowed by Zone).
General information, not legal advice.
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