If your backyard unit or converted garage in the City of Los Angeles was built before January 1, 2020, you can now permit it through a streamlined, penalty-free path instead of tearing it out or rebuilding it to today’s code. LADBS Information Bulletin P/BC 2026-161 (effective July 15, 2026, revised August 5, 2026) puts AB 2533 — now Government Code §66311.7 — into practice. The unit can be judged against the codes in effect when it was built, the California Energy Code does not apply, no architect or engineer is needed to apply, and impact and connection fees are waived. It must still pass a 37-item health-and-safety checklist based on Health and Safety Code §17920.3, and you still pay plan check and permit fees. Units with a basement, more than one story, a slope steeper than 5:1, or a mapped fault, landslide or liquefaction zone go through a different bulletin, P/BC 2026-150.
We are Green Design and Build, a licensed residential general contractor based in Van Nuys (CSLB #1110975), working across Los Angeles, Orange, Ventura and the western edges of Riverside and San Bernardino counties. We build ADUs and garage conversions, and as a licensed contractor we can carry out the optional pre-application inspection the law allows and the corrective work that follows. This guide summarizes the bulletin and the statutes as of October 2026; it is general information, not legal advice.
AB 2533 in Los Angeles at a glance
| Question | Answer under LADBS P/BC 2026-161 |
|---|---|
| Who qualifies? | An ADU or JADU on a residentially zoned lot, built before January 1, 2020 |
| Which code applies? | Current code or the code in effect when the unit was built |
| California Energy Code? | Not required |
| Architect or engineer? | Not required to apply |
| Fees waived | Impact fees, connection fees and capacity charges (unless utility work is needed for health and safety) |
| Fees still due | Plan check and permit fees; LAUSD school fees over 500 sq ft |
| Health and safety test | 37-item LA Substandard Checklist (Form AB2533-01) |
| Pre-inspection | Optional and confidential, by a California-licensed contractor |
| Excluded | Basement; more than one story; slope over 5:1; fault, landslide or liquefaction zone; attached to an apartment or commercial building; not light-frame; too close to another building |
What AB 2533 actually changed
LADBS describes the program as removing three obstacles that kept owners from coming forward: local fines, impact fees, and the requirement to bring an older unit up to current building codes. For a converted garage, that last one was usually the expensive part.
AB 2533 (Chapter 834, Statutes of 2024) was first numbered Government Code §66332; SB 543 renumbered it as Government Code §66311.7, effective January 1, 2026. In plain terms:
- A city or county may not deny a permit for an unpermitted ADU or JADU built before January 1, 2020 because it violates building standards or local ADU rules.
- The exception is a violation that must be corrected to meet the substandard-building standards of Health and Safety Code §17920.3.
- Agencies must publish a checklist of substandard conditions and tell owners they may get a confidential inspection from a licensed contractor before applying.
- Impact fees and connection or capacity charges generally cannot be charged.
- If an inspector finds problems, the agency may not penalize the owner for the unpermitted unit and must approve the permits needed to fix them.
HCD sent Los Angeles a technical-assistance letter on March 24, 2026 on how §66311.7 applies, mostly in apartment buildings. It confirms there is no upper limit on the number of qualifying units. For the basic terminology, see our guide to what counts as an ADU under California law.
Does your unit qualify?
1. It was built before January 1, 2020
You have to prove the date with at least one of these:
- A Rent Stabilization Ordinance rent registration certificate
- Contractor bills or material receipts
- Utility bills or insurance documents tied to the construction
- Code enforcement records, such as an Order to Comply
- A signed and dated lease
- Real estate documents: loan papers, an appraisal, an MLS listing
Bring more than one if you can: an old MLS listing for a guest unit plus a 2018 lease for the same space tell a consistent story, where a single undated photo does not.
2. It is an ADU or a JADU, not just extra rooms
The unit has to meet the state definition of an ADU or JADU — complete independent living facilities with permanent provisions for living, sleeping, eating, cooking and sanitation. A converted garage with its own kitchen and bathroom normally fits. A garage turned into a bedroom with a half bath is unpermitted habitable space, not an ADU, and the bulletin does not cover it or unpermitted additions to the main house. Our junior ADU guide explains how a JADU differs from a full ADU.
3. It is not on the exclusion list
Any one of these sends the project to Information Bulletin P/BC 2026-150 instead:
- A basement, or more than one story
- A slope steeper than 5:1 (20%)
- An Alquist-Priolo fault zone, or a landslide or liquefaction zone
- Attachment to an apartment or commercial building
- Materials other than light-frame construction
- Less than 3 ft from another building on the lot if sprinklered, or 5 ft if not
Exclusion does not remove the state-law protection; it means a more involved review. On hillside lots, check slope and hazard zones first; the City’s ZIMAS parcel map shows mapped fault, landslide and liquefaction areas.
“The code in effect when it was built”: what that means
The unit may comply with current code or with the codes in effect when it was built, and the California Energy Code does not apply. That removes the costliest upgrades on an older conversion, such as insulating finished walls and replacing windows for energy performance.
It is not a free pass. The bulletin’s FAQ spells out the limits:
- Electrical panels. An older panel is acceptable if it met code when installed and is safe. One that is unsafe, undersized, or modified or installed after January 1, 2020 must be repaired or replaced.
- GFCI protection. Required in bathrooms, garages, kitchens, outdoors, laundry areas and near sinks, tubs and showers, depending on the year of construction.
- Bathroom exhaust. Generally required with a shower, tub or spa; units built before 2014 with an unmodified bathroom and an openable window of at least 3 sq ft (half openable) are excepted. Exhaust must terminate at least 3 ft from windows, doors and vents.
- Gas and plumbing. Gas piping gets a pressure test before final; plumbing fixtures must meet the code in effect when installed.
- Pipe insulation. Required only for pipes installed or replaced without permits after January 1, 2020.
Notice the January 1, 2020 cutoff: the bulletin applies it to panels and pipe insulation, and Los Angeles County’s version applies it to any component replaced or modified after that date. So do not “freshen up” an unpermitted unit before applying — a new panel or water heater installed without a permit now can turn old work that would have passed into new work held to current code.
The health and safety checklist
The real test is Form AB2533-01, the LA Substandard Checklist. Its 37 items follow Health and Safety Code §17920.3, the state definition of a substandard building: conditions that endanger the life, limb, health, property, safety or welfare of occupants or the public — inadequate sanitation, structural hazards, nuisances, hazardous wiring, plumbing and mechanical equipment, faulty weather protection, fire hazards, inadequate exits, missing fire-resistive construction and more.
The right-hand column below is what we look at first on a converted garage, not a prediction of what yours needs.
| Checklist area | What it covers | What we check first on a converted garage |
|---|---|---|
| Fire and life safety | Smoke and CO alarms; sprinklers if the main house has them | Alarms in each sleeping room; CO alarm where a garage or gas appliance connects |
| Emergency escape | Window and door size, sill height, exit door, exit path | Small, high garage windows in bedrooms; an exit through the remaining garage |
| Plumbing and gas | Plumbing, water heater strapping, sewer connection | Water heater strapping; how drains tie into the sewer |
| Heating and ventilation | Heating, bathroom ventilation, equipment | A permanent heat source; where the bath fan discharges |
| Electrical | Wiring and panel | Circuits run from the house without a permit; missing GFCIs |
| Light, air and space | Natural light, ventilation, room size | Rooms with no exterior window |
| Structure | Foundations, floors, walls, roofs, fireplaces | Framing altered when the garage door opening was filled in |
| Nuisance and hazards | Pool barriers, weather protection, dampness, mold | Moisture at the old garage-door threshold; the pool barrier |
| Fire separation | Wall ratings and openings by distance | Windows in walls close to the property line |
Anything that fails becomes a correction notice, fixed under the permit before final approval. The inspector may also require concealed work to be exposed, so budget for opening and patching some drywall.
Escape openings, alarms and sprinklers
Emergency escape windows and exit doors
Every sleeping room needs an emergency escape window or door: a clear opening at least 20 inches wide and 24 inches high, a net clear area of at least 5.7 sq ft (5 sq ft for ground-floor windows), and a sill no more than 44 inches above the floor. The unit needs an exit door at least 3 ft wide that opens to a public way or to a yard or court leading to one, reached by a continuous path that does not pass through a garage.
Garage conversions commonly come up short on the bedroom window (a small, high garage window is too small for escape) or the exit path (the only door opens into what is left of the garage). A larger opening under a new header, or a new exterior door, fixes either.
Smoke and carbon monoxide alarms
Working smoke alarms are required in every sleeping room and in the area just outside the bedrooms. A CO alarm is required if an attached garage opens into the unit or there is a fuel-burning appliance or fireplace. Combination smoke and CO alarms are allowed.
Fire sprinklers
Sprinklers are required only if the main house is sprinklered. Sprinkler status also changes the fire-separation rules below.
Fire separation: distance to the property line and other buildings
Checklist item 36 decides whether an exterior wall needs a one-hour fire rating and how many openings it may have, based on its distance to a property line or another building and whether the unit is sprinklered. It is the item that catches units built tight to a side or rear lot line. Item 35 separately requires a one-hour wall between an attached ADU or JADU and the main house.
| Wall facing | Distance | Sprinklered | Not sprinklered |
|---|---|---|---|
| Property line | Under 3 ft | 1-hour wall, no openings | 1-hour wall, no openings |
| Property line | 3 ft to under 5 ft | No rating, openings unlimited | 1-hour wall, openings limited to 25% |
| Property line | 5 ft or more | No rating, openings unlimited | No rating, openings unlimited |
| Another building | Under 3 ft | Not allowed | Not allowed |
| Another building | 3 ft to under 5 ft | 1-hour wall, no openings | Not allowed |
| Another building | 5 ft to under 6 ft | 1-hour wall, no openings | 1-hour wall, no openings |
| Another building | 6 ft to about 8 ft | No rating, openings unlimited | 1-hour wall, no openings |
| Another building | About 8 ft to under 10 ft | No rating, openings unlimited | 1-hour wall, openings limited to 25% |
| Another building | 10 ft or more | No rating, openings unlimited | No rating, openings unlimited |
The bulletin lists 8 ft at the edge of two bands, so confirm with plan check if you are close to it. Measure before adding a window to fix egress: a new opening near the line can create a fire-separation problem.
Fees: what is waived and what you still pay
Waived: impact fees (in Los Angeles, including the Residential Development Fee and the Dwelling Unit Construction Tax) and connection fees and capacity charges, unless utility improvements are needed for health and safety. Park fees and the Affordable Housing Linkage Fee do not apply to ADUs. Still payable: the plan check fee at submittal, permit fees, and LAUSD school fees for an ADU larger than 500 sq ft. Our guide to LADBS permit costs explains how City fees work. We do not publish a price for a legalization because the corrective work depends entirely on what the checklist turns up.
Step by step: legalizing an unpermitted ADU in Los Angeles
- Collect proof of age from the list above.
- Pull the property’s records. The application needs the Certificate of Occupancy and permit records for the permitted buildings on the lot.
- Get the optional confidential pre-inspection from a California-licensed contractor, using Form AB2533-01.
- Prepare the site plan and notes. Form AB2533-02 shows property lines, setbacks, easements, pool barriers, distances to other structures, and the unit’s floor area, height, stories, sprinkler status, bedrooms and bathrooms. Form AB2533-03 carries the standard notes.
- Submit online through ePlanLA or in person by appointment. The work description must reference AB 2533 — the bulletin’s example is “conversion of existing 1-story garage to an ADU per AB 2533.” Pay the plan check fee.
- Plan check verifies the documents, sprinkler status, clearances, residential zoning and fees.
- Clearances as the site requires: LADWP if the structure is in a public utility easement, the Bureau of Engineering for sewer availability and address assignment, and the Fire Department for hydrants and access.
- Permit issued once documents, clearances and fees are complete.
- Inspections and corrections. The inspector checks the unit against the checklist and issues correction notices; you make the corrections under the permit.
- Final inspection and Certificate of Occupancy — the document that makes the unit a legal dwelling.
The forms and announcement are on the LADBS streamlined unpermitted ADU page; the bulletin itself is Information Bulletin P/BC 2026-161.
The optional pre-inspection, and why to do it first
In Los Angeles the pre-inspection uses the same checklist the City uses, the results do not have to be given to LADBS, and it does not replace the City’s permits and inspections. Its value is sequencing: you learn what will fail, and whether you are really on the P/BC 2026-150 path, before you have an open application.
This is work we do: a walk-through against Form AB2533-01, a written list of what fails and why, and a scope and proposal for the corrections. Electrical and plumbing corrections are carried out by licensed specialty contractors we schedule and supervise. If the panel is the issue, see our guide to electrical panel upgrade costs; if an older garage hides original cloth-insulated wiring, read what to do about knob-and-tube wiring. Whoever you hire, verify the contractor’s CSLB license first.
Already have a notice from the City? Ask about the five-year delay
Under Health and Safety Code §17980.12, the owner of an ADU built before January 1, 2020 who receives a notice to correct violations or abate a nuisance can apply to delay enforcement for five years, on the basis that the correction is not necessary to protect health and safety. The agency must grant it if it determines the correction is not necessary for health and safety, after consulting the agency that enforces building standards. Applications cannot be approved on or after January 1, 2030. With §66311.7 barring penalties once you seek a permit, an owner with a notice can apply under AB 2533 or request the delay while planning the work.
Outside the City of Los Angeles
Section 66311.7 applies statewide, but LADBS’s bulletin applies only inside the City — and many homes with a Los Angeles mailing address are not.
For unincorporated areas, Los Angeles County Public Works uses Building Code Manual AM 80.12, approved February 19, 2026. A County inspector verifies the pre-2020 date; the unit must meet the life-safety standards of the County residential code in effect when it was built, with anything replaced or modified after January 1, 2020 held to current code; initial review takes up to 60 days and resubmittals up to 30; and you have two years from permit issuance to reach the Certificate of Occupancy.
Other cities — Burbank, Glendale, Pasadena, Long Beach and those in Orange and Ventura counties — set their own procedures, with state law as the floor. Ask for the AB 2533 checklist each agency must publish, and see our ADU rules by city and Los Angeles ADU rules pages.
Legalize, re-permit, or rebuild?
| Path | When it fits | What it involves |
|---|---|---|
| Legalize under AB 2533 | Built before 2020, single story, not excluded, reasonable condition | Proof of age, site plan, checklist corrections, inspections |
| Permit a new garage conversion | Built after 2020, excluded, or being rebuilt anyway | Full plans to current code, including the Energy Code |
| Demolish and build a detached ADU | Structure failing, badly located or too small | New construction with its own design and permits |
For the second path, our guide to ADU permits in Los Angeles covers the standard process, and the garage conversion cost guide publishes $100,000 to $200,000 for a garage conversion ADU in Los Angeles — budgeting ranges, not a quote. For the third, compare detached ADU vs. garage conversion and see how long an ADU takes.
Every path ends in a unit you can rent openly and describe as a legal dwelling. Our ADU rental income guide shows what a legal unit can earn, and ADU financing options covers paying for the work.
Unpermitted ADU FAQs
What is AB 2533?
AB 2533 is a 2024 California law, now Government Code §66311.7, that bars cities and counties from denying a permit for an unpermitted ADU or JADU built before January 1, 2020 over building-code or ADU-ordinance violations, unless a correction is needed to meet Health and Safety Code §17920.3.
Can I legalize an unpermitted garage conversion in Los Angeles?
Yes, if the converted garage is a complete dwelling unit with a kitchen and bathroom, was built before January 1, 2020, is one story with no basement, and is not on a steep slope or in a mapped fault, landslide or liquefaction zone. LADBS processes it under Information Bulletin P/BC 2026-161.
How do I prove my ADU was built before 2020?
LADBS accepts at least one of: a Rent Stabilization Ordinance registration certificate, contractor bills or material receipts, utility bills or insurance documents, code enforcement records, a signed and dated lease, or real estate documents such as loan papers, an appraisal or an MLS listing.
Does an unpermitted ADU have to meet current building code to be legalized?
No. Under the LADBS bulletin it may meet either current code or the code in effect when it was built, and the California Energy Code does not apply. It must still pass the 37-item LA Substandard Checklist, and a panel modified or installed after January 1, 2020 is held to current code.
What fees are waived for an unpermitted ADU in Los Angeles?
Impact fees, connection fees and capacity charges are waived unless utility work is needed for health and safety, and park fees and the Affordable Housing Linkage Fee do not apply to ADUs. You still pay plan check and permit fees, plus LAUSD school fees if the unit is over 500 sq ft.
Will the City fine me if I apply to permit an unpermitted ADU?
LADBS describes the AB 2533 program as penalty-free, and Government Code §66311.7 bars an agency from penalizing the owner for the unpermitted unit once problems are found, requiring it to approve the permits needed to correct them.
Do I need an architect or engineer to legalize an ADU?
Not to apply under the LADBS bulletin. It uses standard forms — a site plan (AB2533-02) and standard notes (AB2533-03) — instead of full architectural or engineering plans, although certain site conditions can call for added plans.
What if my unit has a basement, a second story, or sits on a hillside?
Units with a basement, more than one story, a slope steeper than 5:1, or a location in an Alquist-Priolo fault, landslide or liquefaction zone are excluded from P/BC 2026-161 and are processed under LADBS Information Bulletin P/BC 2026-150 instead. State law still protects pre-2020 units in those cases; the review is simply more involved.
Find out what your unit needs before you apply
Send us the address, a few photos and whatever proof of age you have. We will walk the unit against the LA Substandard Checklist, tell you whether it looks eligible for the streamlined path, and give you a written scope for the corrections. We are a licensed ADU builder in Los Angeles and build garage conversions across Los Angeles — see one in our garage-to-ADU conversion project, or read how we work on our garage conversion service page. Site visits take about two hours, and proposals follow within 48 hours.