Elizabeth and Union County municipalities require building permits for retaining walls over 4 ft (measured from bottom of footing to top of wall) per N.J.A.C. 5:23. Engineered plans required for walls over 4 ft or with surcharge.
Under the NJ Uniform Construction Code (N.J.A.C. 5:23-2.14), retaining walls 4 feet or taller measured from the bottom of the footing to the top of the wall require a building permit. Elizabeth Construction Code Office requires PE-stamped engineered plans for walls exceeding 4 ft, walls supporting surcharge loads (driveways, structures, slopes), or walls in flood hazard areas. Drainage behind the wall (weep holes, perforated drain, gravel backfill) must be specified. Setbacks from property lines follow local zoning — typically 0–3 ft but may trigger neighbor notification requirements. Tiered wall systems where each tier is under 4 ft but combined height exceeds 4 ft require engineering review if the horizontal separation is less than 2× the upper tier height.
Unpermitted walls: stop-work order, PE review retroactively required. Fines $500–$2,000 per N.J.A.C. 5:23-2.31. Collapse causing damage: civil liability plus demolition order.
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