Indiana Code Title 36. Local Government § 36-8-15-13

Sec. 13. After final approval of the resolution by the board, the board shall proceed with the project, or any part thereof, and shall let all contracts, upon separate plans and specifications, in accordance with IC 5-22, IC 36-1-10, IC 36-1-12, and IC 36-9-13.  The projects authorized may be modified by the board if it considers modification necessary to carry out the purpose of the resolution, so long as the modifications do not increase the estimate of the total cost of the project as adopted in the final resolution.  All other changes must be processed as new resolutions.