This chapter does not require that any changes or improvements be made to lawfully existing structures. However, when an improvement is made to any existing structure, the provisions of § 230-31 shall apply.
The following provisions shall apply whenever any improvement
is made to an existing structure located within any identified floodplain
area:
A.
No expansion or enlargement of an existing structure shall be allowed
within any floodway area that would cause any increase in the elevation
of the base flood elevation.
B.
No expansion or enlargement of an existing structure shall be allowed
within any special floodplain area that would, together with all other
existing and anticipated development, increase the BFE more than one
foot at any point.
C.
Any modification, alteration, reconstruction, or improvement of any
kind to an existing structure to an extent or amount of 50% or more
of its market value shall constitute a substantial improvement and
shall be undertaken only in full compliance with the provisions of
this chapter.
D.
Any modification, alteration, reconstruction, or improvement of any
kind to an existing structure to an extent or amount of less than
50% of its market value shall be elevated and/or floodproofed to the
greatest extent possible.
