San Jose · Land use · Duplex
Where is a duplex allowed in San Jose?
In San Jose, a duplex is allowed in 5 base zones (R-2, R-M, MUN, UR and TR, all with a condition) and not allowed in 5 (San Jose use tables, read October 2026).
Key points
- Allowed: R-2, R-M, MUN, UR and TR
- Not allowed: R-1, R-MH, UVC, UV and MUC
Find your lot's zone on the city zoning map, then read its row. Every status below was read from the San Jose 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
San Jose'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.
| Zone | Status | Code |
|---|---|---|
| R-2 | Allowed — see note Note 2: A maximum of two primary living units per lot, with Accessory Dwelling Units, are permitted in the R-2 district. Accessory Dwelling Units on a lot in the R-2 district may be permitted without a Development Permit in accordance with the provisions of Part 2.75. Note 10: May be used as Transitional Housing. Supportive housing and transitional housing shall be subject only to those restrictions that apply to other residential dwellings of the same type within the same zone. | USES ALLOWED |
| R-M | Allowed — see note Note 2: A maximum of two primary living units per lot, with Accessory Dwelling Units, are permitted in the R-2 district. Accessory Dwelling Units on a lot in the R-2 district may be permitted without a Development Permit in accordance with the provisions of Part 2.75. Note 10: May be used as Transitional Housing. Supportive housing and transitional housing shall be subject only to those restrictions that apply to other residential dwellings of the same type within the same zone. | USES ALLOWED |
| MUN | Allowed — see note Note 6: One-family dwellings or two-family dwellings are allowed as part of a larger development which meets the minimum density requirement in the UR and TR zoning districts. Note 25: May be used as Transitional Housing. | USES ALLOWED |
| UR | Allowed — see note Note 6: One-family dwellings or two-family dwellings are allowed as part of a larger development which meets the minimum density requirement in the UR and TR zoning districts. Note 25: May be used as Transitional Housing. | USES ALLOWED |
| TR | Allowed — see note Note 6: One-family dwellings or two-family dwellings are allowed as part of a larger development which meets the minimum density requirement in the UR and TR zoning districts. Note 25: May be used as Transitional Housing. | USES ALLOWED |
Zones where it is not allowed
What else applies
- Standards for this use: Section 20.30.110.
- 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: Planned Development (PD) and other zones outside the seven supplied chapters; MS-G cells where the three frontage columns differ. Overlay zones and specific plans can also change the answer.
Other uses in San Jose
Who this affects
Frequently asked questions
Can I have a duplex in the R-1 zone in San Jose?
No. San Jose's use table does not allow it in R-1 (USES ALLOWED).
Can I have a duplex in the R-2 zone in San Jose?
Yes, with a condition. San Jose's use table lists it as allowed in R-2 (USES ALLOWED). The code adds a condition: “A maximum of two primary living units per lot, with Accessory Dwelling Units, are permitted in the R-2 district. Accessory Dwelling Units on a lot in the R-2 district may be permitted without a Development Permit in…”
General information, not legal advice.
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