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2026 California Real Estate Law Update: Key Changes Affecting ADUs (2/10)

Posted by Steve Lopez | Nov 03, 2025 | 0 Comments

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.

 

About the Author

Steve Lopez

Steve Lopez is a bilingual attorney with over 22 years of experience in civil litigation, estate planning, and family law. With a background in engineering and a Master's in Negotiations and Conflict Resolution, Steve combines analytical precision and advanced conflict resolution skills to deliver effective legal solutions. Fluent in English and Spanish, he provides culturally sensitive representation to individuals and businesses across Southern California. Steve is experienced in business disputes, real estate litigation, employment defense, and mediation. As a volunteer mediator and active community member, Steve is dedicated to achieving fair resolutions and delivering personalized, results-driven legal services.

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Downey, California Attorney

At the Law Offices of Steve Lopez, we represent individuals, families and businesses throughout California in legal matters ranging from Real Estate, Civil Litigation, Family Law, and Estate Planning.

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