Miami Beach, FL Environmental Rules: Flood Elevation Requirements (2026)

Sec. 54-48 of the floodplain management chapter sets the actual elevation numbers behind Miami Beach's flood rules. For a residential building, the lowest floor, together with its electrical, heating, plumbing, air conditioning, cable, and other service equipment, has to sit no lower than 9.0 feet NGVD (7.44 feet NAVD), the crown of the road or sidewalk plus one foot, or the base flood elevation plus the minimum freeboard, whichever number comes out highest. The same three-way test applies to nonresidential buildings, which the code lets floodproof instead of elevate if a registered engineer certifies the building is watertight below that line.

Sec. 54-35 defines freeboard as the added safety margin above the base flood elevation, and fixes it at a minimum of one foot and a maximum of five feet; a building can go all the way to the five-foot maximum without that extra height counting against the zoning district's overall height limit. Critical facilities, hospitals, fire and police stations, emergency shelters, and similar structures, get a stricter floor under Sec. 54-48(2)(c): the lowest floor has to clear the base flood elevation by two full feet, or meet whatever higher elevation the Florida Building Code sets, whichever is greater.

Everything below the required elevation on an elevated home has to stay unfinished space limited to parking, storage, or building access, with flood vents sized at one square inch of opening per square foot of enclosed area, so floodwater can move through instead of building up against the walls.