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Oxnard, Ventura County
ADUs & home additions in Oxnard, CA.
Oxnard's single-story homes with attached garages make garage-to-ADU conversions and additions some of the most practical projects in the city.
Building in Oxnard
Two Oxnard projects, two kinds of added space.

Oxnard's neighborhoods are full of single-story homes with attached two-car garages, which makes garage-to-ADU conversions one of the most practical projects in the city.
For example, one Oxnard garage conversion started by locating the sewer and confirming its depth before design. The slab and driveway were cut for waste lines, a leveling slab was poured over the sloped garage floor and a new roof was built over the existing walls, with the main house reroofed so both roofs match. The unit, with its own entrance, was finished in about three months.
Additions are common too. Opening existing exterior walls to add a primary bedroom and bathroom, enlarging the kitchen and living room and replacing the windows while the walls are open is a typical Oxnard project; one such addition took about four months of construction.
What to know in Oxnard
- Oxnard's Community Development Department requires a preliminary Planning Division review before ADU plans are submitted; plans are then reviewed by Planning and by Building & Engineering.
- Building submittals go to Building & Engineering at 214 South C Street during open counter hours.
- In 2025, HCD noted that Oxnard planned to apply state ADU law directly rather than amend its older local ordinance, so current state standards are the reference point.
- Parts of Oxnard near the beaches and harbor are in the Coastal Zone, which can add coastal review.
Project types in Oxnard
ADUs and additions in Oxnard.

ADUs
Accessory dwelling units of every type, from feasibility and permits through final inspection.
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Garage-to-ADU Conversions
Reuse an existing garage for the fastest, most economical path to a complete ADU.
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Detached ADUs
Freestanding backyard homes with full foundations, framing, utilities and finishes.
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Attached ADUs
Units that share a wall with the main house, including attached-garage conversions.
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Junior ADUs (JADUs)
Up to 500 square feet created within your existing home, with an efficiency kitchen.
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Home Additions
Room additions, kitchen expansions and roof decks built to blend with your home.
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Second-Story Additions
Build up instead of out, with structural evaluation, engineering and framing done right.
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Primary Suite Additions
Master bedroom and bathroom additions with closets, showers and soaking tubs.
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Oxnard ADU & addition questions
What is the ADU permit process in Oxnard?
Oxnard requires a preliminary review by the Planning Division before plan submission. Plans are then reviewed by Planning and Building & Engineering, with submittals made at 214 South C Street. The contractor prepares the package and manages corrections.
How long did your Oxnard garage conversion take?
About three months of construction, including sewer work, a leveling slab, a new roof and all finishes.
Which ADU rules apply in Oxnard?
According to HCD's 2025 review, Oxnard planned to apply state ADU law directly rather than amend its older ordinance. The contractor confirms current requirements with the city for each project.
Nearby areas
Also serving areas near Oxnard.
Free consultation
Planning an ADU or addition in Oxnard?
Share a few details about your property and the space you want to add. We will pass your request to a licensed local general contractor who specializes in ADUs and additions, and they will follow up directly.
- Free consultation and site visit
- A realistic budget conversation before you pay for plans
- A licensed general contractor from permit to final