Relating to: local regulation of accessory dwelling units. (FE)

AB 449 requires local governments to allow at least one accessory dwelling unit (ADU) - a separate living space on a single-family property - as a standard permitted use, meaning homeowners can build one without special approvals. Local rules may still limit ADU size (to match the main home's square footage), height, or yard space requirements, but cannot block ADUs entirely. The bill also prohibits using newly created ADUs as short-term rentals (like Airbnb) after a specific date. This directly affects homeowners in single-family zones and local governments that set zoning rules.