If any change or alteration of the contract is ordered, it shall be specified in writing and the cost agreed upon between the board and the contractor. If the cost so agreed upon:
(a) Does not exceed the amount specified in Section 113, or
(b) Does not exceed 10 percent of the original contract price,
the board may authorize the contractor to proceed with the change or alteration without the formality of obtaining bids therefor.
No change or alteration shall be authorized the amount of which is within the limitation specified in subdivision (b) and in excess of the limitation specified in subdivision (a) except by four-fifths vote of the board.
(Added by Stats. 1984, Ch. 1128, Sec. 69.)