ADU and garage conversion in Los Angeles

How an ADU permit moves through LADBS

Inside the City of Los Angeles, ADU rules come from two places: state law and the City's own ADU Ordinance, No. 186,481, which took effect on December 19, 2019 and added Section 12.22 A.33 to the Municipal Code. For a garage conversion, the working document is the LADBS information bulletin P/BC 2026-150, which covers converting an existing permitted or unpermitted building, or part of one, into an ADU or junior ADU.

The path has the same six stops for most projects.

1. Plans and records. LADBS wants a complete set of plans for plan check. If the garage was permitted, bring a copy of its Certificate of Occupancy and its earlier building permits so the reviewer can confirm its permitted use.
2. Plan check. LADBS reviews the drawings against the building and zoning codes, and any corrections it identifies have to be addressed on the plans.
3. Clearances. Plan check generates clearances from other City departments, and each one has to be signed before the permit is issued. The common ones are in the table below.
4. Permit. It is issued once the corrections are answered and every clearance is done.
5. Inspections. The inspector can ask for existing covered or concealed work to be opened up so it can be seen. On a garage with old wiring or framing behind drywall, plan for that.
6. Certificate of Occupancy. LADBS issues it after the final inspection passes and the other departments' clearances are approved.

The bulletin is clear that clearances depend on the project and the parcel, so a given lot may get fewer or more than these.

The 60-day clock, and why it is not the same as 60 days to a permit

State law sets two deadlines. The permitting agency has 15 business days to tell an applicant in writing whether an ADU application is complete, and then 60 days from a completed application to approve or deny it when a house already stands on the lot. If it does neither, the application is deemed approved. City Planning's ZA Memo 143 applies that clock to every City agency involved, naming LADBS, City Planning and LADWP.

A denial is an allowed answer inside those 60 days. It comes back as a written list of what is deficient and how to remedy it. So the 60 days is a deadline for an answer, not a promise of a permit, and clearances and corrections add time. The City's own permit records above show a 90-day median for garage conversions.

What LADBS asks of a converted garage

The California-wide habitability rules (room size, ceiling height, light, egress) are covered in the guide to turning a garage into living space. The LADBS bulletin adds Los Angeles specifics that change what a builder has to price.

• Foundation. Existing footings can stay if they are in good condition and meet minimum dimensions. New footings must meet expansive soil depths: 24 inches for exterior footings and 18 inches for interior ones.
• Slab. An existing slab can stay with an approved sealant as a moisture barrier. A new slab has to be at least 3½ inches thick.
• Methane zones. An existing building in a Methane Zone or Methane Buffer Zone does not have to meet the City's methane mitigation chapter if the existing slab stays undisturbed with only hairline cracks. Replacing the slab changes that, so check the lot before deciding.
• The garage door opening. The infill wall is framed with 2x4 studs at 16 inches on center, and the existing garage door header is allowed to stay.
• Fire sprinklers. Required only if the main house already has them, or if major remodeling of the main house done with the ADU triggers them.
• Walls near the property line. Without sprinklers, an exterior wall less than 5 feet from the property line must be 1-hour fire-resistance rated. LADBS says ⅝-inch Type X gypsum board on the entire interior side of the wall, up to the roof line, achieves that.
• Utilities. The ADU needs its own electrical panel and its own water shut-off valve, reachable inside the unit. A detached ADU does not need its own drainage connection if the existing one meets the current plumbing code.
• Energy. New work must meet Title 24 Part 6, with the CF1R compliance form attached to the plans. On these conversions it does not need to be registered with a HERS provider, and no HERS field verification is required.

Parking, setbacks and size: the state rules that apply in Los Angeles

Most of the limits a Los Angeles homeowner runs into come from state law, which the City applies.

• Parking. When a garage or carport is converted to an ADU, or torn down to build one, the City cannot require the lost parking spaces to be replaced. The Bureau of Engineering may require an unused driveway to be removed if all parking leaves the lot.
• Setbacks. A garage converted in place needs no new setback. A new ADU, or one that is not a conversion of an existing structure, can be required to sit no more than 4 feet from the side and rear lot lines.
• Room to grow. An ADU inside an existing accessory structure may expand up to 150 square feet beyond the structure's dimensions, but only for ingress and egress, such as an entry or an exit window.
• Size. A detached ADU can be up to 1,200 square feet. An attached ADU is capped at 50 percent of the existing house. City Planning notes that a floor area limit, or a Historic Preservation Overlay Zone standard that would cap an ADU at 700 square feet, gives way to allow a detached ADU of up to 800 square feet.
• Tearing the garage down. A demolition permit for a detached garage being replaced by an ADU is reviewed and issued together with the ADU permit. No demolition notice or placard is required unless the property is in a historic district.

Size also decides fees. No impact fee can be charged on an ADU of 750 square feet or less, and above that, impact fees are charged in proportion to the main house. The full fee picture, including school fees, is in the garage conversion cost guide, and the statewide permit steps are in the garage conversion permit guide.

Hillside lots, fire zones and the coast

Los Angeles adds one local rule of its own. The City's ADU Ordinance bars ADUs on lots that are in both a Very High Fire Hazard Severity Zone and a Hillside Area, unless the ADU meets listed exceptions. One exception covers lots in the Northeast Los Angeles Community Plan Area and the Silver Lake, Echo Park and Elysian Valley Community Plan Area.

State law has narrowed the rule. ZA Memo 143 says that, following state housing department guidance, the restriction may not be enforced on the state ADU types, which include a conversion inside an existing structure and a detached unit of up to 800 square feet with 4-foot setbacks. For the City's own ordinance ADU types, the memo says the sprinkler and parking parts of the rule conflict with state law and cannot be imposed. What can still apply on a lot in both zones is a dedication to meet the rule's 20-foot street frontage requirement.

Lots in the Coastal Zone are a separate case. State ADU law does not override the California Coastal Act, so the City's Coastal Development Permit procedures apply, and they require a discretionary filing and a public hearing.

LADWP and the new electrical panel

Because the ADU needs its own panel, LADWP is part of the job. Before installing a new residential service panel, a contractor or homeowner must request a meter spot. LADWP does it for free, and it confirms where the new panel can go. The LADWP meter spot page sets out the steps:

• A field representative schedules a site visit within 5 to 15 business days and leaves a sketch of the panel location at the jobsite.
• The LADBS inspector may ask to see that sketch before approving the service panel.
• The online request form covers single-family services up to 320 amps. A panel above a single 225 amp panel also needs a Residential Service Planning Information Form.

Requesting the meter spot early means the electrician will not have to move the panel after it is installed.

Legalizing a garage unit that was built without permits

Many Los Angeles garages already hold a unit built without permits. State law (AB 2533) created what LADBS calls an amnesty program for ADUs and junior ADUs built before January 1, 2020, and LADBS bulletin P/BC 2026-161 sets out the streamlined process.

• Optional private inspection first. The owner may get a confidential third-party inspection from a California-licensed contractor using the City's substandard checklist. The results do not have to be submitted or disclosed to LADBS.
• Proof of age. At least one document showing the unit existed before 2020, such as an RSO rent registration certificate, contractor bills or material receipts, utility bills, a signed and dated lease, or real estate documents like an appraisal or MLS listing.
• Who gets the streamlined route. Units with a basement, more than one story, a site steeper than 5:1, or a location in a fault, landslide or liquefaction zone fall outside it and go through the general bulletin instead.
• Fees. A plan check fee is paid at submission. Under the general bulletin, these pre-2020 units owe no impact fees, connection fees or capacity charges unless utility work is needed to meet health and safety standards.