In unincorporated Pinal County, retaining walls over four feet in height measured from the bottom of the footing require a building permit and plans prepared by an Arizona Registered Engineer. Walls four feet or less are generally exempt.
The Pinal County Development Services Code exempts smaller retaining walls but requires a building permit for retaining walls over four feet in height measured from the bottom of the footing. Such walls, and patio walls or fences exceeding seven feet measured from outside finished grade, must be designed with plans prepared by an Arizona Registered Engineer. The four-foot threshold mirrors the International/Arizona building-code exemption the county adopts. Walls supporting a surcharge (a slope, driveway, or structure load above) can require a permit and engineering regardless of height. These county rules apply to unincorporated land; incorporated cities administer their own building permits.
A retaining wall over four feet built without a permit is unpermitted work; the county can issue a stop-work order and require retroactive permitting with engineered plans, or removal.
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See how Pinal County's retaining walls rules stack up against other locations.
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