Omaha, NE Fence Regulations: Retaining Walls (2026)

Omaha adopts the International Residential Code, which requires a building permit for any retaining wall over 4 feet in height measured from the bottom of the footing to the top of the wall, or for any wall supporting a surcharge (driveway, pool, structure). Walls under 4 feet on level ground with no surcharge are exempt from permit but must still comply with setback, drainage, and property-line rules. Engineered drawings stamped by a Nebraska-licensed professional engineer are required for walls over 4 feet, walls on unstable soils, or terraced walls where aggregate effective height exceeds 4 feet. Omaha's loess and glacial-till soils combined with freeze-thaw cycles and heavy spring rains make proper drainage behind walls critical; most failures occur from hydrostatic pressure. Walls cannot be placed so they divert drainage onto neighboring property. Common retaining-wall locations include hillside lots in Happy Hollow, Dundee, and the bluff neighborhoods above the Missouri. Block, poured concrete, and boulder walls are all permitted subject to engineering.