From first phone call to move-in day, most Oxnard ADUs take somewhere between 6 and 14 months. Here is where the time goes.
Typical timeline for a detached ADU
| Phase | Typical time |
|---|---|
| Consultation, site visit and estimate | 1–3 weeks |
| Design and engineering | 4–8 weeks |
| ADU Zone Clearance (Planning) | A few weeks |
| Building plan check and corrections | 1–3 months |
| Construction | 4–8 months |
| Final inspection | 1–2 weeks |
Garage conversions and junior ADUs
Conversions skip the foundation, framing and roof, so construction is often 2 to 4 months. Design and permitting are usually simpler too.
What slows ADUs down
- Incomplete plans that come back with long correction lists
- Surprises on site: an old sewer lateral, an undersized electrical panel, unpermitted work already on the property
- Coastal Zone review for lots near the beach
- Utility coordination for new service or meters
- Change orders mid-construction
What speeds them up
- A design-build ADU contractor who handles plans and construction together
- A pre-approved plan for a detached ADU, which the city must act on within 30 days
- Making finish selections early, before construction starts
- A thorough site visit before design, so surprises show up on paper instead of in the trench
Want a timeline for your property? Request a free consultation.
Common questions
What is the fastest type of ADU to build?
A junior ADU inside the existing house is usually the fastest, followed by a garage conversion. A new detached ADU, especially a two-story unit, takes the longest.
Does the city have a deadline to approve my ADU?
Yes. Oxnard must decide on a complete ADU application within 60 days, or within 30 days for a detached ADU using a pre-approved plan. Correction rounds pause the clock while you revise plans.