What AB2533 Means for Unpermitted ADUs in Los Angeles

AB 2533 expands statewide amnesty for unpermitted ADUs and JADUs built before January 1, 2020, requiring cities to approve permits if units meet basic health and safety standards, barring serious hazards, and prohibiting the denial of legalization based solely on code violations.

Researchers estimate that Los Angeles has tens of thousands of unpermitted ADUs built before recent reforms.

Starting January 1, 2025, AB 2533 gives unpermitted ADUs a clear path to a legalization through a health-and-safety-first approach, with amnesty from penalties for qualifying properties.

Explore how California ADU law under AB 2533 applies to an accessory dwelling unit built before January 1, 2020 and how a homeowner in Los Angeles can use the new retroactive permit pathway to legalize an unpermitted ADU.

In this guide, you'll learn:

• Who qualifies under AB 2533, including ADUs and Junior ADUs built before January 1, 2020, and what it means for property owners in Los Angeles.
• The step-by-step legalization process, from an ADU permit application to inspection, upgrade list, and final approval under the Substandard Housing Checklist.
• Which ADU permit fees apply and which fees can be waived, including impact fees and connection fees in many cases.
• How LADU guides homeowners through ADU building permits, code compliance, and upgrades with fixed pricing and architect-led support.
• How AB 2533 treats active Notices of Violation, health and safety standards, and the path to legal rental once your dwelling unit meets code.

If you have an unpermitted ADU on your property, LADU can help you get the unit legalized. Our ADU building permit services include securing permits for ADUs built without legal compliance.

Our team prepares your ADU permit application, manages inspections, and coordinates the upgrade list to reach compliance. We'll manage the entire process for you from start to finish so you can receive your certificate of occupancy and be fully legal.

Schedule your free consultation today.

What AB 2533 Means for Unpermitted ADUs in Los Angeles

AB 2533 creates an amnesty path for unpermitted ADUs and Junior ADUs built before January 1, 2020. The goal is to legalize unpermitted ADUs that meet health and safety standards, protect property owners from old penalties, and add safe housing.

Effective Date and Scope

The law took effect on January 1, 2025. It covers both ADUs and Junior ADUs that exist on a property and were built before January 1, 2020. Cities may not deny a permit only because the unit started without permits. The process centers on safety, not punishment.

Learn more by reading the HCD 2025 ADU Handbook and the actual bill text.

Eligibility Rules for Homeowners

To qualify, the unit must be an ADU or Junior ADU built before January 1, 2020. A legalization inspection will check basic health and safety items. If the unit can reach compliance through reasonable upgrades, a retroactive permit will be issued to complete that work.

Why AB 2533 Exists

California needs more safe, legal housing. AB 2533 invites owners to legalize unpermitted units without fear of fines tied to past work. The state is aligning California ADU law with the way many families already live and then raising the bar to current safety standards.

Step-by-Step ADU Legalization Process Under California ADU Law AB 2533

The path to a retroactive permit is structured and clear. Here is how the legalization process works in Los Angeles.

Step 1: Apply for a Retroactive ADU Building Permit

The homeowner or their agent files an application with local agencies. LADU prepares the needed materials so the city can evaluate the unit and set an inspection. Typical submittals include:

• Site plan and floor plan that reflect current conditions.
• Photos of each room and exterior walls.
• Basic utility information for power, gas, water, and sewer.
• Construction history if known, such as the year work was done.

Our ADU design team can update drawings for code compliance, and our permit specialists handle forms, plan updates, and submittals.

Step 2: Health and Safety Inspection

LADBS or an approved third party inspects the unit using the Substandard Housing Checklist. The inspection checks for life safety risks, sanitation, basic heating, and similar items. If issues are found, the city documents them and moves you to the next step with a clear list to fix.

Categories often include:

• Safe exits and windows that open.
• Smoke and carbon monoxide alarms.
• Basic heating that can keep the space warm.
• No exposed or unsafe wiring, and protected outlets near sinks.
• Plumbing fixtures that work and drain correctly.
• Sanitary conditions free of leaks and mold.

Step 3: Permit To Fix Items and Final Approval

The city issues a permit that lists upgrades needed to reach compliance. After the work is completed, a final inspection takes place. Passing the final inspection results in a legal ADU recognized by the city.

Fees, Costs, and Timelines for Retroactive ADU Building Permits Under Assembly Bill 2533

AB 2533 narrows the fees tied to unpermitted status. Homeowners pay normal permit and inspection fees, plus the cost of upgrades needed for compliance. The law removes some big-ticket charges that block many projects and smooths the path to legalization.

What ADU Building Permit Fees Get Waived

AB 2533 waives impact fees and connection fees when no new utility infrastructure is required. Many unpermitted ADUs already share existing utilities, which can keep costs lower under the amnesty rules.

What ADU Permit Fees Still Apply

• Permit and inspection fees charged by the city.
• Plan updates for the retroactive permit.
• Upgrade work listed on the Substandard Housing Checklist.
• New utility infrastructure if the unit needs a separate service.

LADU will map these items in your project budget so there are no surprises.

Los Angeles ADU Specifics: LADBS, UDU Program, and Local Coordination for ADU Permits

Los Angeles has long worked with owners to bring units into compliance. AB 2533 strengthens this approach by directing local agencies to legalize when units can meet health and safety standards.

How AB 2533 Interacts With LA's UDU Ordinance

LA's Unpermitted Dwelling Unit Ordinance built a path to legalize unpermitted units under city rules. AB 2533 widens access for ADUs built before January 1, 2020 and reduces barriers that came from old violations. The shift is toward legalization that delivers safe housing.

Role of LADBS and City Planning for a Retroactive Permit

LADBS reviews the permit application, performs or accepts inspections, and issues the permit that lists required corrections. City Planning may review zoning compliance on items like setbacks or parking that relate to the site.

Both use the checklist to confirm that safety standards are met.

Notices of ADU Permit Violation and Active Cases

An active Notice of Violation does not block an application under AB 2533. The city can issue a permit that allows you to correct the listed items and move to final approval.

Common ADU Upgrades To Reach Building Code Health and Safety

Life-Safety Items for an Unpermitted ADU

• Smoke and CO alarms: Alarms alert occupants early and are required near sleeping areas.
• Safe exits and windows: Bedrooms need an operable window for escape. Doors must open and close without obstruction.
• Guardrails and handrails: Stairs and raised areas need rails to prevent falls.
• Fire separation: If the ADU is within or attached to a garage or main house, certain walls and ceilings may need rated drywall.
• Basic heating: A fixed heat source must keep the space warm during the winter.

Electrical, Plumbing, and Ventilation Fixes

• Grounded outlets and GFCI protection near sinks: This reduces shock risk.
• Panel labeling and safe wiring: Circuits must be labeled and wires covered in boxes.
• Leak repairs and proper traps: Sinks, showers, and toilets must drain to code.
• Fresh air and bath fans: Kitchens and bathrooms need ventilation to control moisture.

When Structural or Layout Work Is Necessary for a Legal ADU

Some unpermitted ADUs, such as older garage conversions, may need insulation, raised slab edges at walls, or safety glass at certain windows. The plan set must show how these details meet building code. LADU's architects create clear drawings that pass review.

Key Documents and Checkpoints To Legalize Unpermitted ADUs

This checklist keeps the project on track from day one.

What To Gather Before Applying for an ADU Permit

• Photos of each space and exterior walls to document current conditions.
• Approximate dimensions of rooms, windows, and doors.
• Any past plans, permits, or contractor invoices you may have.
• Recent utility bills that show service type and load.
• A short note on when the unit was built and any known work history.

ADU Permit Milestones

• Application filed for a retroactive permit.
• Inspection scheduled and checklist completed.
• Permit with corrections issued that lists required upgrades.
• Upgrades completed by a licensed contractor.
• Final inspection passed and legal ADU confirmed.

Benefits of ADU Legalization for Homeowners in 2025

Legalization brings certainty for homeowners and tenants and several key benefits. A legal ADU can be financed, insured, and rented at market rates once approved.

ADU Rental Income and Property Value

A legal ADU can generate steady income and help future appraisals. Generally, an ADU can generate $1,800–$4,500 per month when managed well.

ADU Insurance, Refinancing, and Resale

Legal status reduces risk with insurers and lenders. Refinance options open up, and future buyers gain confidence in the unit. Clear permits and final approvals help protect long‑term value.

Community Housing Gains

Legalizing unpermitted units adds safe homes without new land. The city gains code‑compliant supply and families gain peace of mind.

How LADU Guides the AB 2533 Legalization Process

LADU manages each step so homeowners can move from a retroactive permit to final approval with clarity.

Free Site Visit and Feasibility

Start with a free site visit. We confirm eligibility under AB 2533, review safety items, and outline a 2025 plan tailored to your property.

Architect-Led ADU Plans and Permits

Our architects update drawings, prepare the ADU permit application, and handle local reviews with LADBS and City Planning.

ADU Construction Solutions and Financing Options

LADU arranges for ADU construction and upgrades with licensed partners. We offer financing options that fit your budget so upgrade work stays on track.

ADUs Designed Better. Built Smarter.

Bring Your Unpermitted ADU Into Compliance With ADU California Law in 2025

AB 2533 gives property owners a clear way to legalize unpermitted ADUs and Junior ADUs built before January 1, 2020. Starting January 1, 2025, the law focuses on health and safety, a retroactive permit path, and fewer cost barriers under California ADU law.

Impact fees can be waived when no new utility infrastructure is required, and local agencies must process applications for legalizing ADU. If upgrades are needed, the city lists them so you can correct items and pass final inspection.

Ready to move forward with a retroactive permit and a safe, compliant dwelling unit in 2025? Get a tailored plan, including scope, timeline, and budget.

Start with a free site visit and a quick check of eligibility, then move into permitted upgrades that bring your unit to building code health and safety standards. Call (213) 855-3334 to see if your property qualifies and get a fixed plan for legalization.

Design + Permitting + Build = LADU

Frequently Asked Questions About AB 2533, Compliance, and Timelines

What if my unit was built after January 1, 2020?

AB 2533 targets units built before January 1, 2020. If your ADU is newer, a standard ADU permit path applies. LADU can assess your property and recommend the right route.

Does this apply to Junior ADUs?

Yes. Junior ADUs built before the cutoff can qualify if they meet health and safety standards during inspection.

Will I need new utility connections?

Many units can use existing services. New utility infrastructure may be required if loads exceed capacity or service is unsafe. New infrastructure can affect fees that are otherwise waived. Talk to an ADU expert for a quick eligibility check and a utility review.