3 county-level rules, plus city-specific rules for 1 city in Yavapai County, Arizona.
Verified from official government sources
Section 537, adopted November 19, 2025 to implement Arizona HB 2928, allows one attached and one detached ADU on any residentially zoned lot. Standard maximum size is 1,000 square feet with 5-foot side and rear setbacks.
A one-story detached residential shed in unincorporated Yavapai County does not require a building permit if it is 200 square feet or less and has no plumbing, electrical, or mechanical components. Zoning setbacks still apply.
Converting a garage to livable space in unincorporated Yavapai County requires a residential remodel building permit. The space must meet IRC habitable-room standards, and if a separate dwelling unit is created, Section 537 ADU rules apply.
1 cities in Yavapai County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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