Tucson, Arizona / Syndication Cloud / July 10, 2025 / Custom ADU Builder Marana
State Requirements: Arizona now requires cities with populations over 75,000 to allow ADUs, but each must follow specific state-defined size, setback, and zoning rules.
Size Limits: ADUs are limited to the lesser of 1,000 square feet or 75% of the main residence’s floor area.
Permit Process: Even with streamlined state guidelines, homeowners must still obtain building permits through their local jurisdiction.
HOA Considerations: House Bill 2720 restricts HOAs from outright banning ADUs, but private covenants or deed restrictions may still impose limitations.
Design Flexibility: Cities can no longer force ADUs to exactly match the main home’s exterior; homeowners now have more freedom in choosing materials, colors, and architectural styles.
Arizona’s housing rules changed significantly in 2025 with the introduction of new ADU legislation. Property owners now have more options to add accessory dwelling units, but taking advantage of these changes requires a clear understanding of state guidelines and local regulations.
Overview of Arizona’s New ADU Framework
Arizona’s approach to accessory dwelling units represents a big departure from previous local-only regulations. The state now requires municipalities with populations exceeding 75,000 to allow ADUs on single-family residential properties, creating uniform standards across major metropolitan areas.
This change affects cities like Phoenix, Tucson, and Scottsdale, where property owners previously faced varying local restrictions. The legislation removes many traditional barriers while maintaining essential safety and zoning protections that preserve neighborhood character.
Size and Design Requirements That Matter
Before breaking ground on an ADU, it’s important to understand how size limits will shape your project. Under Arizona’s 2025 l …
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