Any structure or use of a structure or premises must be brought into conformity with these provisions when it is changed, repaired, or improved unless one of the following exceptions is established before the change is made:
(1) The Floodplain Administrator determines that:
(a) Change is not a substantial repair or substantial improvement; and
(b) No new square footage is being built in the floodplain that is not compliant; and
(c) No new square footage is being built in the floodway; and
(d) The change complies with this chapter and the VA USBC.
(2) The changes are required to comply with a citation for a health and safety violation.
(3) The structure is an historic structure and the change required would impair the historic nature of the structure.