Avondale, AZ Accessory Structures: ADU Rules (2026)

Avondale's Zoning Ordinance treats ADUs as a permitted use under Section 28-33(a), not a conditional use, as long as the lot carries no more than one attached and one detached ADU (two attached and detached on lots one acre or larger, or a third detached unit if it is a restricted-affordable dwelling recorded under a 30-year deed restriction). An ADU can't be built before the primary home, must stay secondary in size and function to it, and can never be sold or conveyed separately from the primary dwelling, though either unit may be leased long-term.

Size is capped at 75% of the primary home's interior habitable floor area or 1,000 square feet, whichever is smaller; bedrooms are capped at two; and while an ADU otherwise follows the primary dwelling's setback, height, and lot-coverage standards, its own minimum rear and side yard setbacks are fixed at 5 feet. No extra parking space or in-lieu fee is required, and the lot's existing driveway must serve both units. S. Section 12-1134(G) has run. Restricted-affordable ADUs require an annual compliance report to the director of neighborhood and family services each January 15-30. Tribal land and land near military or FAA-licensed airports are excluded from the section entirely.