How much does an ADU cost in Los Angeles in 2026?

Most detached LA ADUs land between $300K and $500K all-in. Garage conversions typically run $160K–$260K. We hand over a one-page feasibility note with a real number before any contract.

Do you handle LADBS permits?

Yes — full plan set, structural calcs, Title 24 energy compliance, and the LADBS back-and-forth so the homeowner only signs at the milestones.

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.

Ventura County ADU Builder.

We design, permit, and build accessory dwelling units across Greater Los Angeles — detached backyard ADUs, attached additions, garage conversions, and JADUs. One team, one number to call, from the first feasibility walk through the final LADBS inspection.

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

$385 – $510 / sqft installed

Lot access, slab condition, panel upgrade, and finish level move the number most. Pre-approved plans trim 5–10%.

Ventura County permit clock

6–10 weeks ministerial

Plan on 3–5 months for design + LADBS permit, then 4–6 months on-site for an 800–1,000 sqft detached ADU.

Scope — start to keys.

Site walk, feasibility note, and zoning / LAR1 / RD overlay check
Full architectural plan set, structural, MEP, Title 24 energy
LADBS or local-city permit submittal and back-and-forth
Foundation, framing, MEP rough, finishes, landscape tie-in
Final inspection, certificate of occupancy, and warranty

What changes about the permit here.

State ADU law guarantees ministerial review on every single-family lot in the county.
Coastal Development Permit may be required on Ventura / Oxnard waterfront parcels.
VHFHSZ areas require Chapter 7A ignition-resistant exterior assemblies.
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.

How much does an ADU cost in Los Angeles in 2026?: Most detached LA ADUs land between $300K and $500K all-in. Garage conversions typically run $160K–$260K. We hand over a one-page feasibility note with a real number before any contract.
Do you handle LADBS permits?: Yes — full plan set, structural calcs, Title 24 energy compliance, and the LADBS back-and-forth so the homeowner only signs at the milestones.
Can I build an ADU in a hillside zone?: Usually yes, but Hillside Ordinance grading and access rules add design time. We've built in Silver Lake, Mt. Washington, Hollywood Hills, and the Palisades — geotech and shoring are part of the workflow.
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.

ADU 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 adu builder feasibility before you spend on drawings.

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