California Lawmakers Push Bills to Streamline ADU Building and Tenant Protection

The California State Assembly has passed AB 1154, a bill designed to streamline the construction of small Accessory Dwelling Units by creating uniform statewide regulations for units under 500 square feet.

The legislation, authored by Assemblymember Juan Carrillo with strong bipartisan support, now moves to the State Senate for consideration.

The bill specifically targets confusion around Junior ADUs, which are built within existing home footprints including converted garages, by consolidating California's current patchwork of conflicting local regulations into a single standard.

ADUs have emerged as a significant housing solution for California since statewide reforms began in 2016, with over 85,000 units constructed across the state.

These secondary units, also known as in-law units, backyard cottages, or granny flats, provide homeowners with opportunities to generate rental income while adding much-needed housing inventory to communities.

For property developers and homeowners, AB 1154 promises to reduce permitting delays and eliminate regulatory uncertainty that has previously complicated small ADU projects.

The streamlined approval process could make these projects more financially viable by reducing both time and administrative costs, potentially encouraging more homeowners to pursue ADU development as both an investment strategy and contribution to addressing California's housing shortage.