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Assembly Bill 670 added new Civil Code section 4751(a), which provides that any provision of a governing document "that either effectively prohibits or unreasonably restricts the construction or use of an accessory dwelling unit or junior accessory dwelling unit ... is void and unenforceable.”

As with solar energy systems and electric vehicle charging stations, however, the law does permit some restrictions. Section 4751(b) provides that Section 4751(a) "does not apply to provisions that impose reasonable restrictions on [ADUs] or [JADUs] ... mean[ing] restrictions that do not unreasonably increase the cost to construct, effectively prohibit the construction of, or extinguish the ability to otherwise construct."

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Assembly Bill 670 provides that "[i]t is the intent of the Legislature ... to encourage the construction of affordable accessory dwelling units and junior accessory dwelling units that are owner-occupied and that are used for rentals of terms longer than 30 days.”

Accessory dwelling units (ADUs) are defined in detail by California's Government Code. They essentially consist of attached or detached structures on the same lot which provide complete independent living facilities, including permanent provisions for living, sleeping, eating, cooking, and sanitation. Junior accessory dwelling units (JADUs), in turn, are ADUs which are no more than 500 square feet and which are contained within and may share certain facilities with the primary residence.
HOA Law Blog

Occasional musings that aren't legal advice about California HOA law. Reposts and reprints with attribution.