Hoboken, NJ Environmental Rules: Flood Elevation Requirements (2026)

Section 104-16E, Freeboard, sets the elevation floor for every new or substantially improved structure in a special flood hazard area: the lowest floor must sit at or above the base flood elevation (or the advisory base flood elevation, whichever applies) plus the freeboard margin listed in Table I, measured in Hoboken from the bottom of the lowest horizontal structural member. Table I scales freeboard to both building type and flood zone. Ordinary residential structures need one extra foot of freeboard in the X, A and Coastal A zones and two feet in a V zone. Schools, day-care buildings and other nonresidential structures step up to two feet in Coastal A and V zones. Essential facilities, meaning fire, rescue, police and emergency-shelter buildings, hospitals with surgical or emergency care, and power-generating stations, carry the steepest margin: one foot in an X zone, two feet in an A or Coastal A zone, and three feet in a V zone, the same three-foot ceiling that applies to any building that manufactures, processes, stores or disposes of hazardous materials. Fill cannot be used to reach these elevations: § 104-16F bars using fill to elevate a structure or for structural support.

Section 104-17A applies the same numbers to residential construction specifically: a new or substantially improved residential building must have its lowest floor, including any basement, elevated to or above the base flood elevation or advisory base flood elevation, whichever is more restrictive, plus the § 104-16 freeboard, or, in an A Zone, elevated above the highest adjacent grade at least as high as the FIRM's depth number (or two feet if none is specified). The Floodplain Administrator verifies compliance by recording the actual lowest-floor elevation for every new or substantially improved structure under § 104-14C.