The filing fee shall be based on the detailed cost estimate for the proposed construction as filed with and approved by the chief in accordance with paragraph (D) of rule 1501:21-5-04 of the Administrative Code, and shall be determined by the following schedule:
(A) For the first one hundred thousand dollars of estimated cost, a fee of four per cent;
(B) For the next four hundred thousand dollars of estimated cost, a fee of three per cent;
(C) For the next five hundred thousand dollars of estimated cost, a fee of two per cent;
(D) For all costs in excess of one million dollars, a fee of one-half of one per cent.
(E) In no case shall the filing fee be less than one thousand dollars. If the actual cost exceeds the estimated cost by more than fifteen per cent, an additional filing fee shall be required equal to the fee determined by the preceding schedule less the original filing fee.