Ohio Rev. Code Ann. § 4740.09

The fees for licenses and their renewal, including late fees, subject to the approval of the controlling board, shall be determined by each respective specialty section of the Ohio construction industry licensing board. Each respective specialty section of the board may increase these fees, provided that no increase exceeds fifty per cent of the lowest fee determined by that section of the board during the three-year period immediately preceding an increase, and further provided that no increase is made more than once a year.