Maximum building height in unincorporated Maricopa County is established by zoning district in the MCZO. All buildings in rural and single-family residential zones may observe a maximum height of 30 feet. ADUs encroaching into setbacks are limited to 18 feet (1 story) under the updated 2026 zoning ordinance. Height exceptions may apply for agricultural structures in rural zones.
The MCZO limits building height in rural and single-family residential zones to 30 feet, measured from the average natural grade to the highest point of the roof. Under the 2026 zoning ordinance update, ADUs that encroach into setback areas are limited to 18 feet (one story). Agricultural structures such as barns and silos in rural zones may qualify for height exceptions beyond the 30-foot limit. Antenna towers, flagpoles, and mechanical equipment may also exceed the height limit with conditions. Residents in areas near airports should check the Airport Vicinity Overlay zones, which may impose additional height restrictions to protect flight paths around Sky Harbor, Deer Valley, and other county airports.
Specific penalty amounts for this ordinance are not published in a publicly accessible fine schedule. Contact Maricopa County code enforcement directly for current fines, enforcement procedures, and hearing options.
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See how Maricopa County's structure height limits rules stack up against other locations.
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