Charlotte, NC Environmental Rules: Flood Elevation Requirements (2026)

1 of Charlotte's Unified Development Ordinance, new construction or substantial improvement of any residential structure in a community or FEMA special flood hazard area must have its lowest floor elevated to or above the Flood Protection Elevation (FPE). The FPE is defined in Article 27's definitions section as the community base flood elevation plus two feet of freeboard, a buffer that stays in effect until the Storm Water Services program remaps flood hazard areas using new future-conditions criteria; once remapped, the standard drops to base flood elevation plus one foot, except along the Catawba River, Lake Wylie, and Mountain Island Lake, where the two-foot freeboard over the FEMA base flood elevation continues to apply.

Where a property is affected by base flood elevations from both the Catawba River and a tributary stream, the higher of the two elevations controls. Charlotte-Mecklenburg Storm Water Services administers a limited exemption: a substantial improvement to an existing building whose lowest floor sits at least one foot above the FEMA base flood elevation, but below the full FPE, is exempt from the elevate-to-FPE requirement, provided the owner records an affidavit with the Mecklenburg County Register of Deeds before a building permit issues. That affidavit must acknowledge the potential for flood losses, mandatory flood insurance purchase, applicability of FEMA's substantial-improvement rules, and that no local funds are available for buyouts or elevation assistance.

These elevation duties sit within Part IX, Article 27 of the UDO, effective June 1, 2023 and reenacting the City's floodplain regulations that had been effective since July 1, 2021.