Columbia County requires that if the cost of reconstruction, rehabilitation, addition, or other improvements to a building equals or exceeds 50% of the building's market value, then the building must meet the same construction and floodplain management requirements as a new building. Substantially damaged buildings must also be brought up to the same standards. (e.g., a residence damaged so the cost of repairs equals or exceeds 50% of the building's value before it was damaged must be elevated above the base flood elevation).