Passaic County has no boundary-fence law. Shared-fence and "good-neighbor" issues are governed by your municipality's zoning ordinance and by New Jersey property/common law. Disputes over cost-sharing, encroachment or a fence on the property line are typically private civil matters resolved by the towns and the courts.
New Jersey does not have a statewide compulsory boundary-fence statute for residential neighbors, and Passaic County adopts none either — land use is municipal under the MLUL (N.J.S.A. 40:55D-1 et seq.). Your town's zoning code may address the "finished side out" rule, placement relative to the property line, and setbacks; the exact terms differ by borough or township. Encroachment, cost-sharing and boundary-line disputes are handled through survey, negotiation, or the New Jersey Superior Court, not the county. Get a current property survey before building, confirm the lot line, and check your municipal fence provisions. The Passaic County Planning Board does not adjudicate neighbor fence disputes; its role is limited to subdivisions/site plans on county roads and drainage.
There is no county penalty. Municipal zoning enforcement handles ordinance violations; boundary or cost-sharing disputes between neighbors are private civil actions in NJ Superior Court.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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