No purchase, lease, project, or other transaction subject to this section shall be divided into component parts, separate projects, or separate items of work in order to avoid the requirements of this section.
If the bid is for a contract for the construction, demolition, alteration, repair, or reconstruction of an improvement, it shall meet the requirements of section 153.54 of the Revised Code. If the bid is for any other contract authorized by this section, it shall be accompanied by a good and approved bond with ample security conditioned on the carrying out of the contract as determined by the board. The board may let the contract to the lowest and best bidder. Such contract shall be in writing and shall be accompanied by or shall refer to plans and specifications for the work to be done, as approved by the board. The plans and specifications at all times shall be made and considered part of the contract. The contract shall be approved by the board and signed by its chief executive officer and by the contractor, and shall be executed in duplicate.
R.C. § 308.13