The most efficient path to an ADU
A garage conversion is often the most cost-effective way to add an accessory dwelling unit, because the foundation, walls, and roof are already standing. California's ADU laws are notably friendly to conversions, and a garage that spends its life storing boxes can become a rental unit, a home for family, or a private studio.
Efficient does not mean basic. A converted garage should feel like it was always meant to be lived in, with real insulation, real light, a real kitchen and bath, and finishes chosen to last.
What a conversion involves
Every conversion begins with an honest assessment of the existing structure: the slab, the framing, the roof, and how utilities will reach the space. From there, we design the unit and its 3D renderings, prepare permit-ready documents, manage the approval process with your city, and build under our own California general contractor license, CSLB Lic. #1079184. One team is accountable for the entire result.
Where a garage is not a good candidate, we say so at the consultation and walk you through the alternatives, from junior ADUs to detached units.
What a garage conversion costs
Garage conversions typically start around $200,000 in our experience, below our new-build ADU range of $300,000 to $1.5 million, because the slab, walls, and roof are already standing. What moves the number is the condition of the existing structure, how far utilities have to run, whether the slab or foundation needs work, and the finishes you choose. See our ADU cost guide for ranges by ADU type.
Permit steps for a garage conversion in Los Angeles
1. Confirm the lot and the structure. We check the parcel on ZIMAS and assess the garage itself: slab, framing, roof, and how close it sits to the property lines. An attached garage can also become a junior ADU of up to 500 square feet.
2. Design and prepare the plans. Floor plan, structural details, and Title 24 energy compliance (a CF1R on the plans), drawn to what LADBS checks in a conversion.
3. Submit to LADBS. Under state law, the city has 15 business days to decide whether the application is complete, then 60 days to approve or deny a complete application, or it is deemed approved.
4. Plan check, permit, and inspections. We answer corrections, pull the permit, and build through inspections to final sign-off for the new unit.
What LADBS checks in a converted garage
For a detached garage, the LADBS conversion bulletin sets out the key requirements. No replacement parking is required for the lost garage, and no added setback is required for the existing structure. An exterior wall closer than 5 feet to a property line (3 feet if the unit is sprinklered) must be 1-hour fire rated. Ceilings must be at least 7 feet, habitable rooms at least 70 square feet, and each bedroom needs an emergency escape opening. The existing foundation can stay if it is sound and was code-compliant when built. The unit needs its own water shutoff and electrical panel, but a separate sewer line is not required if the existing service meets code. Fire sprinklers are required only if the main house has them, or if remodel work on the house with the ADU exceeds 50 percent of its replacement cost within a year.
Related: ADU builder in Los Angeles, ADU cost in Los Angeles.
Common questions
How much does a garage conversion ADU cost?
Garage conversions typically start around $200,000, below our new-build ADU range of $300,000 to $1.5 million, because the structure already exists. The specifics of your garage and finishes set the real number, which we give you at the consultation.
Do I lose required parking if I convert my garage?
California's ADU laws substantially relaxed parking replacement requirements for conversions in most situations. We confirm exactly how your city applies the rules as part of our feasibility review.
Can any garage be converted?
Most can, but not all should be. Condition of the slab and framing, ceiling height, and utility access decide it, and we assess all of that honestly before you spend a dollar on design.
LADBS: ADU conversion of an existing detached structure | HCD ADU Handbook (March 2026) | Gov. Code 66317 (review deadlines)
Rules change and every lot is different. This page is general information, not advice for your property; confirm the rules for your lot before you design or build.