The provisions of this chapter do not require any changes or improvements to be made to lawfully existing structures. However, when an improvement is made to any existing structure, the provisions of § 8-702 shall apply.
No expansion or enlargement of an existing structure shall be allowed
within an AE Area/District without floodway that would, together with
all other existing and anticipated development, increase the BFE more
than one foot at any point.
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.