Ventura County · FAQ

Ventura County ADU questions, answered

Questions we get on almost every Ventura County site walk. If yours isn't here, ask us — we answer everything before you commit.

Does state ADU law apply in Ventura County?

Yes — every city in the county follows the state floor. Ministerial 60-day review, one detached ADU + one JADU per single-family lot.

Do I need a Coastal Development Permit in Ventura?

Only if the parcel is inside the Coastal Zone — generally the Ventura waterfront and Oxnard's coastal strip. Most inland parcels do not.

Is my Conejo Valley lot in the fire zone?

Many north-slope parcels in Thousand Oaks, Newbury Park, and Camarillo are designated VHFHSZ. We pull the parcel against the CalFire map during feasibility.

How does the HOA review work in Thousand Oaks?

The HOA cannot deny an ADU outright (state law preempts), but they can review materials, paint colors, and elevations. We typically run their review in parallel with city plan check.

Is unincorporated Ventura County slower?

Slightly — county Resource Management runs 2–4 weeks longer than city plan check. Quality of review is similar.

Reference

Terms and guides for this page

Glossary terms

Ministerial Review
Permit review based purely on objective standards — no public hearing, no discretion.
Coastal Development Permit (CDP)
Permit required for construction inside California's Coastal Zone, issued by the city or the California Coastal Commission.
Title 24
California's energy efficiency code — required for all new construction and most additions.
ADU (Accessory Dwelling Unit)
A self-contained second home on a residential lot, with its own kitchen, bath, and entrance.
JADU (Junior Accessory Dwelling Unit)
A smaller ADU carved out of the existing house, capped at 500 sqft, with owner-occupancy required.
AB 68
2020 California law that streamlined ADU permits — 60-day clock, parking exemptions, ministerial review.

Field guides

The Los Angeles ADU permit process, step by step
Permitting an ADU inside the City of Los Angeles takes about 8–11 weeks of plan check (LADBS) plus 2–4 weeks of pre-submittal prep. State law caps ministerial review at 60 days from a complete submittal. Total city + utility fees for a 700 sqft detached ADU typically run $13,000–$26,000.