FEMA’s 50% Rule
The “50% Rule” is a requirement mandated by the Floodplain Management Ordinance. The rule does NOT apply to structures located in an “X” or “D” zone. In all other flood zones, the rule applies and it requires any building or structure improved, damaged or repaired 50 percent or more than the value of the building or structure to be brought up to Florida Building Code standards, including any FEMA or elevation requirements.
More information is available at: https://www.charlottecountyfl.gov/departments/community-development/building-construction/50-percent-rule.stml