Retaining walls over 4 feet in height (measured from bottom of footing to top of wall) require a building permit and engineered drawings sealed by a Louisiana-licensed professional engineer. Permits are issued by the Department of Safety and Permits. Walls in drainage servitudes or near the levee system face additional review by the Sewerage and Water Board and the Orleans Levee District.
New Orleans adopts the Louisiana State Uniform Construction Code, which incorporates the International Residential Code and International Building Code. Under IRC R404 and IBC Chapter 18, retaining walls exceeding 4 feet from the bottom of footing to the top of wall, or any wall supporting a surcharge load, require engineered design and a building permit through the One Stop Shop at City Hall. Because much of New Orleans sits below sea level on soft alluvial soils, the Department of Safety and Permits typically requires a geotechnical report addressing bearing capacity, settlement, and lateral earth pressure. Louisiana civil law (Civil Code articles 660 through 665) governs lateral support obligations between adjoining estate owners, and an owner who excavates may be liable for damage to neighboring buildings if proper shoring is not provided. Walls within a public drainage servitude or within 1500 feet of a federal levee require sign-off from the Sewerage and Water Board and the Southeast Louisiana Flood Protection Authority. Proper drainage (gravel backfill plus weep holes or perforated drain pipe) is mandatory to prevent hydrostatic pressure failure, which is a frequent cause of wall collapse in this high-water-table environment. Tiered walls separated by less than twice the lower wall height are evaluated as a single combined structure.
Specific penalty amounts for this ordinance are not published in a publicly accessible fine schedule. Contact New Orleans code enforcement directly for current fines, enforcement procedures, and hearing options.
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