Lewisville requires a building permit for retaining walls exceeding 4 feet in height measured from the bottom of the footing to the top of the wall. Engineered plans are required for taller walls. Retaining walls near Lewisville Lake floodplain areas face additional review.
Lewisville requires building permits for retaining walls exceeding 4 feet in height as measured from the bottom of the footing to the top of the wall, consistent with the adopted International Building Code (IBC). Retaining walls over 4 feet must be designed by a licensed Texas Professional Engineer, and stamped engineering plans must be submitted with the permit application. Walls retaining a surcharge (driveway, parking area, or building load above the wall) may require engineering regardless of height. In areas near Lewisville Lake, Timber Creek, or other FEMA-designated floodplain zones, retaining walls face additional review to ensure they do not impede floodwater flow or alter drainage patterns. The city's development engineering division reviews grading and drainage plans for retaining walls that affect stormwater management. Retaining walls with fences mounted on top are measured from the base of the retaining wall to the top of the fence for combined height compliance with zoning fence height limits.
Unpermitted retaining walls must obtain retroactive permits or be removed. Fines up to $2,000 for building code violations. Stop-work orders issued for construction without permits.
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