Ohio Revised Code Title LV. Roads Highways Bridges § 5555.69

(A) In case of an unforeseen contingency not contemplated by a contract, allowances for extra work may be made by a board of county commissioners, but the board must first enter into a new contract in writing for the extra work. In all cases in which the amount of the original contract price is less than twenty-five thousand dollars for any particular line item listed in the new contract and the overall total estimate for the extra work does not exceed ten per cent of the total of the original contract, the contract for the extra work may be let by the board at private contract without publication or notice.Section 5555.61 of the Revised Code applies to all other new contracts for extra work, except that if an emergency exists and the time required for complying with section 5555.61 of the Revised Code would unduly delay the completion of the project, the board, after making a finding of emergency and entering it on its records, may contract for the extra work by private contract without complying with that section.

(B) No contract shall be awarded for extra work at any price in excess of the original contract unit price for the same class or kind of work in connection with the original contract. If there is any new class or kind of work, the board and contractor shall agree as to the price to be paid. The contractor shall submit a bid in writing, and if the board accepts the bid, the board immediately shall enter its acceptance on the journal. The costs of the extra work shall be paid by the board out of any funds available therefor, and shall be charged to the cost of construction of the improvement and apportioned as the original contract price for the improvement.