ADU Rules: Oxnard vs Ventura
How do adu rules rules compare between Oxnard, CA and Ventura, CA?
Ventura has fewer restrictions than Oxnard.
Oxnard, CA
Ventura County
Oxnard permits ADUs in all residential and mixed-use zones following California ADU law. Detached ADUs may be up to 1,200 sq ft. Attached ADUs are limited to 50% of the primary dwelling or 1,200 sq ft, whichever is less.
View full Oxnard rules →Ventura, CA
Ventura County
Ventura permits ADUs and JADUs on lots with existing or proposed single-family or multifamily dwellings, consistent with California Government Code § 65852.2 (ADU) and § 65852.22 (JADU). State law preempts local bans in single-family zones, and Ventura's local zoning standards in Division 13 of the San Buenaventura Municipal Code (SBMC) must conform to those statewide floors.
View full Ventura rules →Key Facts Comparison
| Fact | Oxnard | Ventura |
|---|---|---|
| Detached Max Size | 1,200 sq ft | - |
| Height Limit | 16 ft general, up to 25 ft near transit | - |
| JADU | Up to 500 sq ft within existing home | - |
| Parking | Not required near transit | - |
| Processing | Ministerial approval within 60 days | - |
| State authority | - | Cal. Gov. Code § 65852.2 (ADU) and § 65852.22 (JADU) |
| Local zoning chapter | - | SBMC Division 13 Zoning Regulations |
| Max detached ADU size | - | 850 sq ft (1,000 sq ft with 2+ bedrooms) under § 65852.2(a)(1)(D)(i) |
| Max JADU size | - | 500 sq ft within existing/proposed single-family dwelling |
| Min side/rear setback | - | 4 ft for new detached ADUs (§ 65852.2(a)(1)(D)(vii)) |
| Coastal Commission | - | Applies in Ventura's coastal zone |
Highlighted rows indicate differences between cities.
Oxnard FAQ
Can I build an ADU in Oxnard?
Yes. ADUs are permitted in all residential and mixed-use zones. Detached units can be up to 1,200 sq ft with a 16-foot height limit. No additional parking is needed if you are within half a mile of transit.
Can I sell my ADU separately in Oxnard?
No. Under California law, ADUs generally cannot be sold separately from the primary residence, though they may be rented.
Ventura FAQ
Can Ventura ban ADUs in single-family zones?
No. Gov. Code § 65852.2 preempts local bans on ADUs in residential zones that allow single-family or multifamily use. Ventura must permit at least one ADU and one JADU on qualifying single-family lots.
How big can my ADU be?
State law guarantees at least 850 sq ft (or 1,000 sq ft with two or more bedrooms) for a detached new-construction ADU. Attached ADUs may be up to 50% of the primary dwelling or 1,200 sq ft.
Does Ventura's coastal zone affect ADUs?
Yes. Properties within the California Coastal Commission's coastal zone require a Coastal Development Permit or local equivalent in addition to the ADU permit.
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