If you own a home in Los Angeles with an unpermitted accessory dwelling unit, the clearest path to legalize it is through Assembly Bill 2533, a California amnesty law signed in September 2024 that forces local agencies to approve legalization permits for ADUs built before January 1, 2020, unless a specific health or life-safety correction is needed.1California Legislative Information. Assembly Bill (AB) 2533 The law also waives impact fees and connection or capacity charges, and bars the city from penalizing you for having the unpermitted unit when you come forward. For most homeowners with a converted garage or back-house, this is a dramatically easier and cheaper route than existed before.
Why AB 2533 Is the Right Path for Most Owners
Before AB 2533, Los Angeles could reject a legalization application for any building code violation, however small. The new law changed that. Inspectors now evaluate pre-2020 units against a substandard housing checklist rather than requiring full compliance with today’s building code.2Los Angeles County Building and Safety. Legalizing Unpermitted ADUs and JADUs Handout (AB2533) If your garage was converted in 2015 without permits, you aren’t going to be forced to tear out drywall because it doesn’t match current insulation standards. You’ll be asked to fix the things that actually make a unit unsafe to live in.
Three features of the law matter most:
- Only pre-January 1, 2020 units qualify. Work done after that date must meet current code in full.
- Impact fees and utility connection or capacity charges are waived.
- The city cannot cite or fine you for the unpermitted unit when you apply.
You also have the option, before filing anything, of hiring a licensed contractor or design professional to do a confidential third-party inspection. That way you know what corrective work to expect before the city has a file open on your property.
The City’s Older UDU Program: Usually Not the Answer
Los Angeles has its own legalization program under Ordinance No. 184,907, codified at LAMC Section 14.00.A.10 and known as the Unpermitted Dwelling Unit ordinance.3Los Angeles City Planning. Unpermitted Dwelling Units It only applies in multi-family zones (R2 or less restrictive), requires that the unit was occupied as a residence between December 11, 2010 and December 10, 2015, and demands that the property include at least one Restricted Affordable Unit with rents capped at very low, low, or moderate income levels under a recorded affordability covenant of 55 to 99 years.4American Legal Publishing. Los Angeles Municipal Code SEC. 14.00 – Public Benefit Projects For a typical single-family homeowner with a converted garage, that affordability commitment makes the UDU program impractical. AB 2533 is almost always the better route.
What Inspectors Will Check
Legalization under either pathway rests on health and safety standards drawn from the California Health and Safety Code. These are the items that most often come up during inspection of a converted or back-house unit.
Ceiling height in habitable rooms must be at least seven feet. Every sleeping room needs an emergency escape window large enough for a person to climb through, opening directly to a yard or public way. Smoke alarms are required in every sleeping room, outside each sleeping area, and on every level of the unit. Carbon monoxide alarms are required outside sleeping areas and in any unit with an attached garage or fuel-burning appliances.
The unit must have a functional kitchen with a sink and cooking facilities, a bathroom with a toilet, washbasin, and bathtub or shower connected to approved sewage, hot and cold running water, adequate heating, natural light, and ventilation. Electrical systems need to be safe and grounded, especially in kitchens and bathrooms. Water heaters must be properly strapped and vented.
Fire separation between an attached ADU and the main house is a frequent sticking point and often means installing specific types of gypsum board on shared walls and ceilings. If someone removed a load-bearing wall or made other structural changes without engineering oversight, expect to hire a licensed engineer to verify the work is sound.
A unit that fails on any of these points isn’t rejected outright under AB 2533. The city issues permits for the corrective work, you complete the fixes, and then you receive final approval.
Documents You’ll Need
A complete application tells the city, on paper, what already exists on the ground. You’ll need:
- Architectural site plans showing the ADU’s position relative to the primary residence and property lines
- Floor plans with all rooms, windows, and doors labeled
- Elevation drawings showing the exterior from multiple angles
- Structural calculations from a licensed engineer if the unit involved structural modifications
- Title 24 energy calculations demonstrating compliance with California’s building energy efficiency standards5California Energy Commission. Building Energy Efficiency Standards
Measure carefully before you submit. If your floor plan shows a window that isn’t there, or your site plan places the unit five feet from the property line when it’s actually three, an inspector will catch it and your file goes back for revision.
How to File
Applications go to the Los Angeles Department of Building and Safety either through its online permit portal or in person at a Development Services Center. The file enters plan check, where city engineers verify that drawings comply with applicable codes. Review timelines vary with staffing and project complexity but typically run several weeks. Paying an additional 50 percent of the plan check fee can expedite review.
What It Will Cost
Permit fees from LADBS are based on the valuation of the construction work. The city’s published fee sample shows a straightforward conversion of an existing 400-square-foot garage valued at $20,000 running roughly $1,045 in total permit fees.6City of Los Angeles. Appendix 2.4 – Summary of Case Filing and Building Permitting Fees Most garage-to-ADU legalizations land on the lower end since the structure already exists.
Under AB 2533, impact fees and utility connection or capacity charges are waived. If your unit does need electrical service installed, upgraded, or relocated, LADWP charges separately for that work.7Los Angeles Department of Water and Power. Construction and Renovation – Electric Service Requests
Beyond city fees, budget for professional work: architectural plans, structural engineering, Title 24 calculations, and a land survey if setbacks need to be confirmed. Together these can run several thousand dollars depending on complexity. Add the cost of any safety corrections the inspector requires. Even so, legalization through the amnesty almost always costs less than the fines, lien risk, and potential demolition order that come with ignoring an unpermitted unit.
Garage Conversions and Parking
If your unpermitted ADU is a converted garage, you don’t have to replace the lost parking. California Government Code 65852.2 prohibits a city from requiring replacement off-street parking when a garage, carport, or covered parking structure is demolished or converted to an ADU.8California Legislative Information. California Government Code 65852.2 SB 1211, in 2024, expanded that exemption to cover uncovered parking spaces removed to build an ADU.9Digital Democracy. SB 1211 – Land Use: Accessory Dwelling Units: Ministerial Approval Losing a two-car garage does not trigger any replacement obligation.
How Property Taxes Will Change
Legalizing the ADU will raise your property tax bill, but not as much as owners often fear. Under Proposition 13, the assessor treats the ADU as a home addition. Only the new improvement is assessed at current market value; your main home is not reassessed.10Office of the Assessor, County of Santa Clara. Granny Units/Accessory Dwelling Units
For a garage conversion where you modified the interior but left the exterior shell intact, only the alterations get valued. Areas that weren’t touched aren’t reassessed. If a space was renovated down to stud walls, the assessor can treat the whole renovated area as new. The supplemental tax bill arrives a few months after the project is finalized. If you believe the added assessment is too high, you can request an informal review with the assessor’s office, ideally within 30 days of receiving the notice, before filing a formal appeal.
If You Plan to Rent It Out
The Los Angeles Rent Stabilization Ordinance explicitly lists ADUs among the property types that can fall under its scope.11Los Angeles Housing Department. What is Covered under the RSO Whether yours does depends on how it’s situated.
A completely detached ADU is generally exempt from rent stabilization’s price caps because the Costa-Hawkins Act bars local rent controls on units built after February 1, 1995; even if the structure is older, the newly permitted residential use typically postdates that cutoff. An ADU attached to a primary residence built before October 1978 can pull both buildings under the RSO’s umbrella, though Costa-Hawkins still prevents the city from setting the initial rent on the new unit. The ADU would still be subject to RSO eviction protections and other rules beyond rent caps.
Properties with ADUs that are rented or offered for rent must register with the Los Angeles Housing Department, and units subject to the RSO or Just Cause Ordinance owe the associated registration fees.12Los Angeles Housing Department. Accessory Dwelling Unit Skip this step and you create problems that will surface the first time a tenant dispute escalates.
What Happens If You Leave It Unpermitted
Three things tend to catch owners off guard.
Insurance. Most homeowners policies focus on current condition and risk profile. An insurer may issue a policy without knowing about unpermitted work, but if damage happens in or because of the unpermitted space, the claim can be denied. An electrical fire in an unpermitted conversion is the textbook example. If the insurer discovers unpermitted construction during a claim investigation, it can cancel the policy or refuse to renew.
Selling. California law requires disclosure of known unpermitted work to prospective buyers. An undisclosed unpermitted ADU found during inspection or after closing leads to price renegotiations, canceled escrows, or post-sale legal disputes. Many lenders discount or decline to finance properties with unpermitted structures. A legalized ADU with a certificate of occupancy adds clear value and simplifies the sale.
Code enforcement. When the city identifies an unpermitted unit through a neighbor complaint, a property transfer, or a routine observation, the Code Enforcement Bureau sends an Order to Comply, usually giving around 30 days to begin legalization or remove the unpermitted features. Ignore it and fines accrue daily. Continued non-compliance can result in a lien or legal action from the city attorney’s office. If the unit cannot meet health and safety standards, the city will require you to restore the property to its original permitted condition by removing kitchens, bathrooms, or interior walls.
Proactive legalization under AB 2533, with waived impact fees and a safety-only compliance standard, costs a fraction of enforcement-driven legalization, and dramatically less than tearing out a functional living space because you waited too long.