Rankin County requires a building permit for retaining walls over 4 feet measured from bottom of footing to top of wall, or any wall supporting a surcharge load. Engineered plans are required for permitted walls. Walls near Ross Barnett Reservoir face additional PRVWSD review.
Rankin County Planning and Zoning 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) per the adopted International Residential Code §R404.4. Walls supporting a surcharge load (driveway, structure, or slope above) require a permit regardless of height. Engineered drawings sealed by a Mississippi-licensed professional engineer are required for permitted walls. Design must address lateral earth pressures, drainage (weeping tile, gravel backfill, outlets), and global stability. Walls within shoreline setbacks on Ross Barnett Reservoir are subject to PRVWSD shoreline management rules, requiring additional review and potential approval from the District before construction. Walls near property lines must meet general accessory structure setbacks in the zoning ordinance. Rankin County's rolling terrain and expansive clay soils make drainage design especially important to prevent failure.
Unpermitted walls over 4 feet: stop work order, retroactive engineering required, potential removal if unsafe. Fines $200 to $1,000. Wall failure causing damage to neighbor property: civil liability.
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