Section R105.3.1.1 of the International Residential Code is amended to read as follows:

R105.3.1.1 Determination of substantially improved or substantially damaged existing buildings in flood hazard areas. For applications for reconstruction, rehabilitation, addition or other improvement of existing buildings or structures located in an area prone to flooding as established by Table R301.2(1), the Building Official shall examine or cause to be examined the construction documents and shall prepare a finding with regard to the value of the proposed work.

For buildings that have sustained damage of any origin, the value of the proposed work shall include the cost to repair the building or structure to its pre-damaged condition. If the Building Official finds that the value of proposed work equals or exceeds 50 percent of the market value of the building or structure before the damage has occurred or the improvement is started, the finding may be appealed as provided in PCC 17C.10.060.

Applications determined to constitute substantial improvement or substantial damage shall require all existing portions of the entire building or structure to meet the requirements of Section R322, and Title 18E PCC.