Indiana Code Title 36. Local Government § 36-9-36-7

(1) The works board shall include in a contract for an improvement a provision that requires all incidental, inspection, and engineering costs to be advanced and paid by the contract or to the board, upon the final acceptance of the improvement, for payment by the board to persons entitled to the incidental, inspection, and engineering costs.

(2) The contractor is then subrogated to all rights of the unit and those persons to all the incidental, inspection, and engineering costs subsequently included in and assessed upon the assessment roll.

(3) The costs belong to the contractor as a part of the assessments.