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

SB 473 requires local governments to allow at least one accessory dwelling unit (ADU) per single-family lot as a "permitted use" without special permits, directly affecting homeowners in residential and mixed-use zones. Localities may still set reasonable limits on ADU size (capped at the main house's square footage), height, and setbacks, but cannot impose additional approvals for standard ADUs. The bill also prohibits new ADUs created after its effective date from being used as short-term rentals (like Airbnb), while allowing existing ADUs to remain unaffected. This standardizes ADU access across the state while giving communities flexibility to manage development.