Scottsdale requires building permits for retaining walls over 4 feet in height (measured from bottom of footing to top of wall). In the ESLO overlay, retaining walls are subject to additional design standards to protect the natural desert environment. All retaining walls must be designed to handle the specific soil and drainage conditions of the Sonoran Desert.
Retaining walls in Scottsdale require a building permit when they exceed 4 feet in total height from the bottom of the footing to the top of the wall. Walls retaining a surcharge (supporting a driveway, structure, or additional slope load) require a permit regardless of height. Engineering plans stamped by a licensed Arizona structural or civil engineer are required for permitted retaining walls. In ESLO areas, retaining walls must be designed to blend with the natural desert landscape using earth-tone colors and natural materials where feasible. Scottsdale's desert environment presents unique soil challenges including caliche (calcified soil layer) and expansive clay that affect retaining wall design. Drainage behind retaining walls must be properly addressed to prevent hydrostatic pressure buildup. Combination retaining wall/fences that exceed total height limits require special review.
Unpermitted retaining walls or walls that fail structurally may result in code enforcement action, required demolition and reconstruction, and potential liability for damage to adjacent properties.
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