How big can an ADU be in Oxnard?

Detached ADUs in Oxnard can be up to 1,200 sq ft. Attached ADUs: 50% of primary home, max 1,200 sq ft. JADUs up to 500 sq ft.

How much does it cost to build an ADU in Oxnard?

Build costs typically range $150,000 – $320,000, or $210 – $290 per square foot.

Verified March 14, 2026

ADU Regulations in Oxnard, California

Q: What are the setback requirements for ADUs in Oxnard?

Front: Same as primary dwelling. Side: 4 ft. Rear: 4 ft.

Ventura County · CA · Pop. 210,000

Max ADU Size

1,200

sq ft detached

Rear Setback

4 ft

Permit Timeline

60 days

Build Cost

$150,000 – $320,000

Zoning

Allowed ADU Types

✓Detached ADU

✓Attached ADU

✓JADU (Junior ADU)

✓Garage Conversion

Max per lot: 2 ADUs✓ No owner-occupancy required

ADUs allowed by-right per California state law; coastal zone parcels may require Coastal Development Permit

Source: City of Oxnard — Accessory Dwelling Units · Oxnard Zoning Ordinance Section 16-700

Dimensions

Size & Setback Requirements

Detached

1,200

sq ft max

JADU

500

sq ft max

Attached

50% of primary home, max 1,200 sq ft

Setbacks

front

Same as primary dwelling

side

4 ft

rear

4 ft

Max height: 16 ft

Lot coverage: Per underlying zone; coastal areas may have additional restrictions

Properties in the Coastal Zone require additional review through the CA Coastal Commission

Permitting

Permit Process

Department

Oxnard Community Development Department

Review Timeline

60 days; coastal zone may take longer

Permit Fees

$7,000 – $15,000

Impact Fees

Impact fees waived under 750 sq ft

Required Documents

›Site plan
›Floor plans
›Elevations
›Title 24 energy compliance
›Coastal Development Permit application (if in coastal zone)
›Structural drawings

Coastal Zone ADUs add permit time and cost — confirm location with planning department first

Visit Oxnard Community Development Department →

Infrastructure

Utilities & Requirements

Solar

Required

Parking

Not required

Separate Meter

Optional

Fire Sprinklers

See note

Sewer: Connect to City of Oxnard sewer or Calleguas Municipal Water District

Fire Sprinklers: Not required unless primary structure requires them

Parking: No additional parking required

Financials

ADU Costs in Oxnard

Typical Build Cost

$150,000 – $320,000

Cost per Sq Ft

$210 – $290

Monthly Rental

$1,700 – $2,900/mo

Property Value Added

Adds $150,000 – $290,000 to property value

Available Grants & Programs

★CalHFA ADU Grant Program available

Ventura County coastal location supports strong rental demand year-round

Use the free ADU Cost Calculator →

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Disclaimer: Information is compiled from publicly available municipal codes for general informational purposes only. It does not constitute legal, zoning, or construction advice. Regulations change frequently. Always verify with your local planning department. Last verified: March 14, 2026. Verify with Oxnard Community Development Department

Explore More

Nearby Cities in Ventura County

Simi Valley

Max 1,200 sq ft · $155,000 – $310,000

Thousand Oaks

Max 1,200 sq ft · $150,000 – $400,000

Ventura

Max 1,200 sq ft · $160,000 – $325,000

Oxnard Quick Facts

Max size1,200 sq ft
Rear setback4 ft
Permit timeline60 days
Build cost$150,000 – $320,000
Rental income$1,700 – $2,900/mo
Owner occupancyNot required

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Official Source

City of Oxnard — Accessory Dwelling Units

Oxnard Zoning Ordinance Section 16-700

Last verified: March 14, 2026

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