Legalize Your Unpermitted ADU Without Penalties

California AB 2533 makes it possible - We make it easy.

Your unpermitted ADU can now be legally recognized thanks to AB 2533. Our experts handle the entire legalization process - even if you've received a Notice of Violation (NOV).

Modern home with accessory dwelling unit

What is AB 2533?

A groundbreaking California law that helps homeowners legalize existing unpermitted ADUs

Modern ADU example

AB 2533 Fact Sheet

No Permit Denial

Local agencies cannot deny permits for unpermitted ADUs or JADUs built before January 1, 2020, even if they don't comply with building codes or local ordinances.

No Penalties

Property owners are protected from being penalized for having unpermitted units when applying for legalization.

Reduced Fees

No impact fees or connection charges except when utility infrastructure is required for health and safety compliance.

Health & Safety Focus

Local inspectors can assess the unit for health and safety standards and provide recommendations for compliance.

Our ADU Legalization Services

From assessment to final approval, we handle the entire process

Initial Assessment

Comprehensive evaluation of your unpermitted ADU to determine legalization requirements and compliance issues.

Architectural Planning

Professional architectural drawings and plans needed for permit applications and building code compliance.

Permitting Support

Complete management of all permit applications, fees, and interactions with local building departments.

Inspection Coordination

Preparation for and management of all required inspections to ensure successful compliance approvals.

Benefits of Legalizing Your ADU

Transform your unpermitted unit into a valuable legal asset

Increased Property Value

Legal ADUs can significantly increase your property's market value. Unpermitted units may actually decrease value during home inspections or appraisals.

Legal Protection

Avoid potential fines, fees, and legal complications that can arise from maintaining an unpermitted dwelling unit on your property.

Insurance Coverage

Insurance companies may deny claims for damages in unpermitted structures. Legal ADUs can be properly insured, protecting your investment.

Financing Options

Legal ADUs qualify for refinancing, home equity loans, and can be factored into mortgage applications, unlike unpermitted units.

Safety Assurance

Legal ADUs meet building code requirements for safety, ensuring proper electrical, plumbing, ventilation, and fire safety standards.

Rental Income Legitimacy

Legally rent your ADU without concerns about code enforcement or tenants reporting the unpermitted status during disputes.

Types of ADUs in California

Understanding the different ADU classifications under California law

Detached ADU example

Detached ADUs

Standalone structures separate from the primary residence. These can be newly constructed or converted from existing structures like garages or sheds.

  • Up to 1,200 square feet allowed under state law
  • Minimum 4-foot setbacks required
  • Can be legalized with AB 2533 if built before 2020
Attached ADU example

Attached ADUs

Units connected to the primary dwelling, typically created through home additions or conversions of attached garages or other spaces.

  • Size limited to 50% of primary dwelling or 1,200 sq ft
  • May share walls, systems with main house
  • Often easier to connect to existing utilities
Junior ADU example

Junior ADUs (JADUs)

Smaller units created within the walls of the primary residence, often from a bedroom conversion or similar repurposing of space.

  • Maximum 500 square feet in size
  • May have shared or independent bathroom
  • Typically requires minimal exterior modifications

California ADU Regulations

Key statewide requirements for Accessory Dwelling Units

Size Requirements

  • Detached ADUs: Up to 1,200 square feet
  • Attached ADUs: 50% of primary dwelling or 1,200 sq ft (whichever is less)
  • Junior ADUs: Maximum 500 square feet
  • Minimum size: Must allow for efficiency unit (150 sq ft + bathroom)

Setback Requirements

  • Minimum 4-foot side and rear setbacks for new ADUs
  • No setback required for garage conversions
  • Front setbacks typically follow local zoning
  • Special provisions for fire safety near property lines

Parking Requirements

  • One parking space per ADU generally required
  • Parking requirements waived if ADU is:
  • - Within ½ mile of public transit
  • - In an historic district
  • - Within one block of car share location
  • - In an area with residential parking permits

Owner-Occupancy Rules

  • No owner-occupancy requirement for standard ADUs until 2025
  • Owner-occupancy required for Junior ADUs
  • Owner must live in either the primary residence or the JADU
  • Some local jurisdictions may have additional requirements

Our Proven ADU Legalization Process

A simple 4-step approach to legalizing your unpermitted ADU

1

Free Consultation & Assessment

We evaluate your unpermitted ADU, identify potential issues, and create a customized legalization plan based on AB 2533 provisions.

Architectural assessment for ADU
2

Design & Documentation

Our architects and engineers create all necessary plans, drawings, and documentation required for the permitting process.

Architectural plans for ADU legalization
3

Permit Application & Processing

We manage the entire permit application process, working directly with local agencies to address any concerns using AB 2533 provisions.

Permit processing for ADU legalization
4

Inspection & Final Approval

We coordinate and prepare for all necessary inspections, address any compliance issues, and secure final approval for your now-legal ADU.

Happy homeowners with legalized ADU

Why Legalize Your ADU?

Benefits of legalizing your unpermitted ADU with AB 2533

Increased Property Value

Legal ADUs significantly increase your property's market value and appeal to potential buyers.

Legal Protection

Avoid potential legal issues, fines, and forced demolition by bringing your ADU into compliance.

Rental Income

Legally rent your ADU for additional income with the confidence of having all proper permits and approvals.

Safety Assurance

Ensure your ADU meets safety standards, protecting both your property and its occupants.

Insurance Coverage

Secure proper insurance coverage for your ADU, which may be limited or denied for unpermitted structures.

Peace of Mind

Eliminate the stress of potential code enforcement actions and enjoy your property without worry.

Frequently Asked Questions

Everything you need to know about AB 2533 and unpermitted ADU legalization

AB 2533 is a California law that helps homeowners legalize unpermitted Accessory Dwelling Units (ADUs) built before January 1, 2020. It prohibits local agencies from denying permits for existing unpermitted ADUs and prevents them from penalizing homeowners for having these unpermitted units. The law specifically aims to increase housing availability by bringing existing units into compliance with building codes while protecting homeowners from prohibitive fees and penalties.

Yes! Under AB 2533, local agencies are required to approve necessary permits to correct noncompliance with health and safety standards, even if you have received a Notice of Violation (NOV) from code enforcement. Our team specializes in helping homeowners with NOVs legalize their ADUs. We'll work directly with code enforcement officials, demonstrate that your unit qualifies for AB 2533 protection, and develop a compliance plan that satisfies all requirements while minimizing costs and disruption.

No. AB 2533 specifically prohibits local agencies from penalizing applicants for having unpermitted ADUs or JADUs that were constructed before January 1, 2020. This protection allows homeowners to come forward and legalize their units without fear of fines or penalties. However, you'll still need to bring the unit into compliance with basic health and safety standards, which is where our expertise becomes valuable. We'll help you navigate the process with minimal cost and hassle.

Under AB 2533, property owners are not required to pay impact fees or connection/capacity charges except where utility infrastructure is required to comply with health and safety standards. This significantly reduces the cost burden of legalizing an existing unpermitted ADU. However, standard permit processing fees may still apply. During our free consultation, we'll provide a detailed breakdown of expected costs based on your specific situation and jurisdiction requirements.

We provide comprehensive ADU legalization services including architectural planning, engineering assessments, permitting support, and coordination with city inspectors. We handle the entire process from initial consultation through final approval, specializing in complex cases with code violations or NOVs. Our team is powered by GatherADU.com and includes experienced architects, engineers, and permitting specialists who understand the nuances of AB 2533 and local building codes throughout California.

The timeline for legalizing an unpermitted ADU varies depending on several factors, including the condition of your ADU, local jurisdiction processing times, and the extent of modifications needed. Typically, the process takes between 3-6 months from initial consultation to final approval. Our streamlined approach and expertise in AB 2533 provisions help expedite the process as much as possible. During your consultation, we'll provide a more specific timeline based on your unique situation.

AB 2533 applies to all types of unpermitted ADUs and JADUs (Junior Accessory Dwelling Units) that were constructed before January 1, 2020. This includes garage conversions, basement conversions, detached structures, and additions to existing homes. Even if your ADU doesn't meet current zoning requirements like setbacks or size limitations, AB 2533 provides a pathway to legalization as long as basic health and safety standards can be met. Our experts can evaluate any type of existing unpermitted unit and determine the best approach for legalization.

If your ADU requires significant modifications to meet health and safety standards, our team will develop a cost-effective compliance plan that minimizes disruption while ensuring all requirements are met. Under AB 2533, local agencies must approve necessary permits for these modifications. Our architectural and engineering expertise allows us to identify creative solutions that often reduce the scope and cost of required changes. During our consultation, we'll assess your specific situation and provide transparent recommendations for bringing your ADU into compliance.

There are several ways to demonstrate that your ADU existed before January 1, 2020, including: previous utility bills showing service to the unit, tax records, insurance documents, dated photographs, satellite imagery, previous property listings mentioning the unit, lease agreements, or affidavits from neighbors or contractors. Don't worry if you don't have perfect documentation - our team can help evaluate the evidence you have and suggest additional ways to establish the construction date. We have experience working with local agencies to verify eligibility under AB 2533.

The first step is to schedule a free consultation with our team. During this consultation, we'll discuss your specific situation, evaluate your ADU's eligibility under AB 2533, identify potential compliance issues, and outline a preliminary plan for legalization. To prepare for the consultation, it's helpful to have information about when your ADU was built, any documentation you have about its construction, and details about any code enforcement actions or notices you've received. Contact us at (323) 591-3717 or schedule online at app.gatheradu.com/meeting.

Ready to Legalize Your ADU?

Take advantage of AB 2533 and transform your unpermitted ADU into a valuable, legal asset.

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AB2533.com is powered by GatherADU.com, California's trusted experts in ADU planning, permitting, and legalization.

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