73A.9  Nonapproved contracts void.
  If an appeal is taken, no contract for public improvements shall be valid unless the same is finally approved by the appeal board. In no case shall any municipality expend for any public improvement any sum in excess of five percent more than the contract price without the approval of the appeal board.
[C24, 27, 31, 35, 39, §359; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §23.9]
C93, §73A.9