accessory dwelling units; fire sprinklers

This bill requires Arizona municipalities with over 75,000 residents to allow accessory dwelling units (ADUs) - small rental homes on single-family lots - as permitted uses, without requiring additional parking, design matching, or restrictive covenants. It mandates that all lots zoned for single-family homes must permit at least one attached and one detached ADU, with size limits (max 75% of main home or 1,000 sq. ft.). Municipalities may only require fire sprinklers in ADUs if they already had residential sprinkler ordinances before December 2009; otherwise, they cannot impose such requirements. Failure to adopt compliant regulations by January 1, 2025, would automatically allow ADUs without restrictions on all residential lots. The bill directly affects homeowners seeking to add ADUs and local governments managing zoning rules.