(a) If changes in plans or specifications are necessary after the performance of the contract is begun or if it is necessary to decrease or increase the quantity of work to be performed or of materials, equipment, or supplies to be furnished, the governing body of the municipality may approve change orders making the changes.
(b) The total contract price may not be increased because of the changes unless additional money for increased costs is appropriated for that purpose from available funds or is provided for by the authorization of the issuance of time warrants.

(c) If a change order involves a decrease or an increase of $50,000 or less, the governing body may grant general authority to an administrative official of the municipality to approve the change orders.
(c-1) If a change order for a public works contract in a municipality with a population of 240,000 or more involves a decrease or an increase of $100,000 or less, or a lesser amount as provided by ordinance, the governing body of the municipality may grant general authority to an administrative official of the municipality to approve the change order.
(d) The original contract price may not be increased under this section by more than 25 percent. The original contract price may not be decreased under this section by more than 25 percent without the consent of the contractor.
(e) This section applies only to a contract awarded through a competitive procedure as required by § 252.021.