Gilroy · Land use · Duplex
Where is a duplex allowed in Gilroy?
In Gilroy, a duplex is allowed in 5 base zones (R1, R2, R3, R4 and RH, all with a condition) (Gilroy use tables, read October 2026).
Key points
- Allowed: R1, R2, R3, R4 and RH
Find your lot's zone on the city zoning map, then read its row. Every status below was read from the Gilroy 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
Gilroy's code calls this use “Duplex (1)”. 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 |
|---|---|---|
| R1 Single-Family Residential District | Allowed — see note Note 1: See section 30.11.15 (Specific housing use types). Note § 30.11.15(f): A duplex is permitted on a corner parcel that is at least eight thousand (8,000) square feet in size in the R1 zoning district. | Article XI — RESIDENTIAL USE TABLES |
| R2 Two (2) Family Residential District | Allowed — see note Note 1: See section 30.11.15 (Specific housing use types). | Article XI — RESIDENTIAL USE TABLES |
| R3 Medium Density Residential District | Allowed — see note Note 1: See section 30.11.15 (Specific housing use types). | Article XI — RESIDENTIAL USE TABLES |
| R4 High Density Residential District | Allowed — see note Note 1: See section 30.11.15 (Specific housing use types). | Article XI — RESIDENTIAL USE TABLES |
| RH Residential Hillside District | Allowed — see note Note 1: See section 30.11.15 (Specific housing use types). | Article XI — RESIDENTIAL USE TABLES |
What else applies
- Standards for this use: § 30.11.15(f) Duplex/Triplex/Fourplex Housing: a duplex is permitted on a corner parcel that is at least 8,000 sq ft in the R1 zoning district.
- Triplex or fourplex: only on corner parcels in R1 and R2 in lieu of an ADU/JADU (§ 30.11.15(f)). Condominiums/Townhomes is a separate row.
- 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: ND (Neighborhood District): residential table shows '*', use per master/specific plan; Hecker Pass and Glen Loma Ranch special use districts: specific-plan tables not in text; OS and PF districts are lists (S24, S25), not tables. Overlay zones and specific plans can also change the answer.
Other uses in Gilroy
Who this affects
Frequently asked questions
Can I have a duplex in the R1 zone in Gilroy?
Yes, with a condition. Gilroy's use table lists it as allowed in R1 (Single-Family Residential District) (Article XI — RESIDENTIAL USE TABLES). The code adds a condition: “See section 30.11.15 (Specific housing use types). A duplex is permitted on a corner parcel that is at least eight thousand (8,000) square feet in size in the R1 zoning district.”
General information, not legal advice.
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