Gilbert requires building permits for retaining walls over 4 feet high. Engineered plans are needed for taller walls, and combined fence-retaining wall heights are regulated by the Land Development Code.
Retaining walls in Gilbert exceeding 4 feet from bottom of footing to top require a building permit and engineered structural plans. When a fence is placed atop a retaining wall, the combined height is subject to zoning regulations. Retaining walls must be designed for the site's soil and drainage conditions. Walls near property lines may require setbacks. The Development Services department reviews retaining wall permits through building plan review. Gilbert's flat topography means retaining walls are less common than in hillside communities but are still needed for grading and drainage management.
Unpermitted retaining walls over 4 feet face enforcement including retroactive engineering review. Structurally deficient walls may require reconstruction.
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