New Jersey's statewide Uniform Construction Code requires a construction permit for any retaining wall four feet or taller (measured footing to top). Morris County sets no separate rule; the permit is issued by your municipal construction official.
Under N.J.A.C. 5:23-2.14(g), a construction permit is required before building, enlarging, altering or demolishing a retaining wall (or series on the same slope) totaling four feet or more, and even for a wall under four feet if it negatively affects a foundation. Height is measured from the bottom of the footing to the top of the wall. This is a statewide code enforced by each municipality's construction official — Morris County does not issue the permit. Local zoning may add setback or placement limits under N.J.S.A. 40:55D-65. Engineered plans are typically required for taller walls.
Building a regulated retaining wall without a UCC construction permit brings stop-work orders and penalties from the local construction official under N.J.A.C. 5:23.
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