New Bill Expands Oversight and Uniform Standards for ADUs and JADUs in California
California continues to refine its housing laws to make accessory dwelling units (ADUs) and junior accessory dwelling units (JADUs) easier to build, and to ensure consistency in how local governments regulate them. A new bill revises multiple provisions of the Planning and Zoning Law to clarify size definitions, streamline approval procedures, and extend state oversight over local ordinances governing JADUs.
Contractors and homeowners alike stand to benefit from this bill, particularly those who have struggled with bureaucratic red tape and conflicting local agency requirements. In the past, builders often faced delays or denials because planning departments, building divisions, and utility agencies applied inconsistent rules or interpretation of ADU and JADU standards. By requiring uniform state guidelines and centralized oversight from the Department of Housing and Community Development (HCD), this legislation minimizes those discrepancies. Contractors can now rely on clear, standardized definitions, such as measuring unit size by interior livable space, and predictable approval timelines. The result is a more transparent, streamlined process that reduces costly project delays and helps contractors focus on building homes rather than navigating inconsistent local bureaucracy.
Expanding State Oversight to Include JADUs
Previously, the Department of Housing and Community Development (HCD) had authority to review and adopt uniform guidelines for ADUs, but not for JADUs. The bill extends that authority to JADUs as well, allowing the HCD to issue, amend, or repeal guidelines that clarify the terms, standards, and references applicable to JADUs.
Local Ordinances Must Be Submitted for State Review
Cities and counties that adopt ADU ordinances are already required to submit them to the HCD within 60 days for review. The new law extends this requirement to JADU ordinances.
If a local agency fails to submit its ordinance, or if it ignores a determination by the HCD that its ordinance is noncompliant, the ordinance will be deemed void.
Streamlining the Permit Process
California law currently requires local governments to act on ADU and JADU applications within 60 days. The new bill enhances this process by adding specific procedural safeguards:
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Application completeness review: Agencies must determine whether an ADU or JADU application is complete within 15 business days of submission.
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Written notice requirement: If incomplete, the agency must notify the applicant in writing, listing missing items and explaining how to fix them.
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Right to cure and appeal: Applicants can correct deficiencies, and if the agency later denies the application, it must offer an appeal process and issue a final written decision within 60 business days of receiving the appeal.
Importantly, if a city or county has not adopted a compliant ordinance, ADU and JADU applications must still be processed under ministerial approval, meaning the local government cannot delay or deny the project based on unrelated local rules or policies.
Impact Fees and Utility Connections
To reduce barriers to construction, California limits how local governments and utilities can assess impact fees and connection charges for ADUs. The new bill extends those same protections to JADUs.
Specifically:
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No impact fees may be charged for ADUs up to 750 square feet or JADUs up to 500 square feet of interior livable space.
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For larger ADUs, fees must be proportional to the size of the primary dwelling.
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The same restrictions on requiring new or separate utility connections now also apply to JADUs, except in limited circumstances allowed by law.
This bill reinforces California's commitment to expanding small-scale housing opportunities by aligning the regulatory treatment of ADUs and JADUs. By clarifying definitions, expanding HCD oversight, limiting local discretion, and simplifying the approval process, the legislation seeks to make it easier for homeowners to create legal, affordable living spaces across the state.
At The Law Office of Steve Lopez, we help property owners, developers, and contractors stay ahead of California's constantly evolving housing and construction laws. Our team closely monitors legislative updates affecting ADUs, JADUs, and residential zoning so clients can make informed decisions and avoid costly compliance issues. Whether you're planning to build, facing delays due to conflicting agency requirements, or need guidance on local ordinance challenges, our office can help you navigate the permitting process, resolve regulatory obstacles, and protect your project timelines. Contact us today for a consultation to ensure your project moves forward smoothly under California's new housing standards.

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