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Westside Garage Conversion.

Converting an existing garage into a legal, comfortable living unit is the fastest path to an ADU in Los Angeles. State law strongly favors it, most LA jurisdictions allow it as-of-right, and we run the whole project — confirm feasibility, plans, LADBS permit, structural upgrade, finishes — under one contract.

Westside permits move quickly when the parcel is clearly inside the city of LA or Santa Monica grid — both jurisdictions run ministerial ADU review under state law. The variables are Coastal Zone status (anything west of Lincoln Blvd in Venice / Marina Peninsula), and whether a soft-story or seismic ordinance applies to the existing structure.

Westside cost band — 2026

$160K – $260K all-in

Slab condition, panel capacity, and whether the roof structure can stay determine the bottom of the band.

Westside permit clock

8–12 weeks ministerial

Plan on 2–3 months for design + LADBS permit, then 3–4 months on-site for a typical 400 sqft conversion.

Scope — start to keys.

  • Slab and foundation inspection, structural upgrade scope
  • Wall framing, roof tie-in, fire separation per CBC
  • Full MEP — panel/sub-panel, plumbing rough, HVAC mini-split
  • Insulation, drywall, kitchen + bath buildout, finishes
  • LADBS or local permit submittal and inspections

What changes about the permit here.

  1. City of LA parcels: LADBS ePlanLA portal, ministerial ADU review under LAMC §12.22-A,33.
  2. Santa Monica parcels: SMMC §9.31.300 — locally streamlined, similar 60-day clock as state law.
  3. Coastal Zone (Venice west of Lincoln, Marina Peninsula): Coastal Development Permit may be required.
  4. Mello Act applies to demolition or replacement of existing residential units in the Coastal Zone.

What moves the Westside number.

  • Westside labor and dump fees price 8–12% above LA County median.
  • Coastal Zone parcels often add $15–40k in CDP consultant + biology survey costs.
  • Santa Monica seismic retrofit pairing on a duplex can add $35–80k tied to the ADU permit cycle.
  • Tight street parking (Venice, Mar Vista) drives crane / pump days higher than Valley jobs.

In short.

How much does a garage conversion cost in Los Angeles?
Most LA garage-to-ADU conversions land between $160K and $260K all-in. The slab, panel, and roof condition are the three biggest swing factors.
Do I need to keep parking when I convert my garage?
Under state ADU law, most LA jurisdictions cannot require replacement parking when you convert a garage to an ADU. Transit-proximity and historic district overlays can change this — we confirm in the feasibility note.
Can I convert a detached garage on the property line?
Usually yes, but the wall on the property-line side needs to be 1-hour fire-rated with limited openings. The existing wall sometimes qualifies; sometimes it gets re-built.
Do I need a Coastal Development Permit for a Westside ADU?
Only if the parcel is inside the Coastal Zone — generally west of Lincoln Blvd in Venice and the Marina Peninsula. Inland Westside parcels (most of Santa Monica, Brentwood, Mar Vista east of Lincoln) do not.
Can I build an ADU in Santa Monica's R1?
Yes. SMMC §9.31.300 mirrors state ADU law on R1, R2, and multifamily lots, with ministerial 60-day review once the submittal is complete.

More we build in Westside.

Garage Conversion in nearby LA areas.

Got a Westside project in mind?

Send us the address and we’ll pull Westside zoning, setbacks, and garage conversion feasibility before you spend on drawings.

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