Oxnard ADU Permits: A Homeowner's Guide

Every ADU project in Oxnard needs a building permit. The city does not require a separate zoning clearance from Current Planning. If the property sits in Oxnard's designated Coastal Zone, a Coastal Development Permit is also required, and that adds meaningful time to the schedule.

The 2026 ordinance

• ADUs range from an efficiency unit up to 1,200 square feet, with permanent provisions for living, sleeping, eating, cooking and sanitation.
• New detached ADUs generally maintain at least four feet of setback from rear and side property lines.
• ADUs created by converting existing permitted space, such as a garage or basement, may have zero setback requirement.
• A building permit is required for all ADU projects.
• No separate zoning clearance from the Current Planning Division is required.

The Coastal Zone step

Properties within the Coastal Overlay Zone require a Coastal Development Permit alongside the building permit, satisfying both the local ordinance and California Coastal Commission standards.

What the building review covers

• Zoning conformance
• Building code plan review
• Fire requirements
• Structural engineering
• Utility connections
• Drainage and site conditions
• Flood zone considerations
• Corrections and resubmittals
• Inspections
• Final sign-off

See our Oxnard ADU contractor page, or how ADU permitting works generally.

ADU laws and local requirements can change. Information on this page is general and is not a guarantee that a specific project will be approved. Confirm current requirements for the property and jurisdiction before making project or financial decisions.