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Ventura County JADU Builder.

A Junior ADU carves up to 500 sqft out of an existing single-family house, typically a converted bedroom or attached garage bay. It is the lightest-touch path to a permitted rental unit in LA — and the owner can keep occupying the main house. We handle the plan set, the LADBS permit, and the build.

Ventura County permits run cleanly under state ADU law. Each city (Oxnard, Camarillo, Thousand Oaks, Ventura) has its own building department, but all hold ministerial review at 60 days from a complete submittal. The variables are the Coastal Zone (waterfront parcels) and Very High Fire Hazard Zones along the foothills.

Ventura County cost band — 2026

$95K – $180K all-in

Existing plumbing wall proximity and whether the entrance already exists drive the band.

Ventura County permit clock

6–10 weeks ministerial

Plan on 6–10 weeks for design + LADBS permit, then 8–12 weeks on-site.

Scope — start to keys.

  • Feasibility check — interior wall layout, plumbing access, exterior entry
  • Kitchenette, efficiency bath, and bedroom buildout
  • Separate exterior entrance, fire-rated demising wall if required
  • Owner-occupancy deed restriction and LADBS sign-off
  • Sub-panel, plumbing tie-in, mini-split HVAC

What changes about the permit here.

  1. State ADU law guarantees ministerial review on every single-family lot in the county.
  2. Coastal Development Permit may be required on Ventura / Oxnard waterfront parcels.
  3. VHFHSZ areas require Chapter 7A ignition-resistant exterior assemblies.
  4. Thousand Oaks and Conejo Valley HOAs commonly add a parallel architectural review.

What moves the Ventura County number.

  • Lower labor cost than LA city — typically 8–12% below LADBS-area equivalents.
  • VHFHSZ Chapter 7A on Conejo Valley / Ventura backcountry parcels adds $18–35k.
  • Coastal Zone CDP on Ventura / Oxnard waterfront adds $15–35k in soft costs.
  • HOA architectural review (Thousand Oaks) is fee-light but schedule-heavy.

In short.

What is a JADU and how is it different from an ADU?
A JADU (Junior ADU) is a unit up to 500 sqft built inside the footprint of an existing single-family house — usually a converted bedroom or garage. It requires owner-occupancy and is faster/cheaper to permit than a full ADU.
Can I have both a JADU and an ADU on my LA lot?
Yes — state law allows one JADU plus one ADU on most single-family lots in LA. The combination is often the best path for multi-generational living plus rental income.
How much does a JADU cost in Los Angeles?
Most LA JADUs land between $95K and $180K all-in. Existing plumbing proximity and whether the entrance already exists are the biggest swing factors.
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.

More we build in Ventura County.

JADU Builder in nearby LA areas.

Got a Ventura County project in mind?

Send us the address and we’ll pull Ventura County zoning, setbacks, and jadu builder feasibility before you spend on drawings.

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