SB1415 is a bill that mandates municipalities in Arizona with populations over 75,000 to adopt regulations allowing accessory dwelling units (ADUs) on any lot or parcel zoned for single-family dwellings. The bill outlines specific requirements and prohibitions for the development of ADUs. Municipalities must permit at least one ADU per lot, with additional ADUs allowed if they are designated as restricted-affordable dwelling units. ADUs are limited to 75% of the gross floor area of the primary dwelling or 1,000 square feet, whichever is less.

The bill prohibits municipalities from imposing certain restrictions on ADUs, such as requiring a relationship between the occupants of the main dwelling and the ADU, mandating additional parking, or enforcing design conformity with the primary dwelling. It also prevents municipalities from setting ADU regulations that are more restrictive than those for single-family dwellings in the same zoning area. If a municipality fails to adopt the required regulations by January 1, 2025, ADUs will be allowed without limits. The bill includes definitions for terms such as "ADU," "gross floor area," and "restricted-affordable dwelling unit," and clarifies that it does not supersede building, fire, or public health codes, except that ADUs cannot be required to comply with commercial building codes or contain fire sprinklers. The bill also states that it does not apply to lots or parcels on tribal lands.

Statutes affected:
Introduced Version: 9-461.18
Senate Engrossed Version: 9-461.18