Retaining walls over 4 feet tall or with a surcharge load require engineered drawings and a permit inside San Antonio. Edwards Aquifer recharge zones add drainage review.
Bexar County sits over the Edwards Aquifer recharge and contributing zones, and retaining walls that change site drainage can trigger Texas Commission on Environmental Quality Edwards Aquifer Protection Plan review for projects disturbing more than one acre. In unincorporated areas there is no general residential building permit, but Bexar County Public Works must approve work in the regulated floodplain, and plat notes may restrict grading. San Antonio follows the International Residential Code, which exempts retaining walls 4 feet or less measured from the bottom of the footing to the top of the wall, provided they do not support a surcharge. Walls taller than 4 feet, tiered walls, or walls retaining a driveway or structure require a Texas-licensed professional engineer's sealed design. Helotes, Fair Oaks Ranch, and hillside areas along Scenic Loop often add slope and drainage review. Runoff must not be directed onto neighbors.
Contact your local code enforcement office for specific penalty information.
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See how Bexar County's retaining walls rules stack up against other locations.
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