(a) If no petition is presented under Section 55.526 of this code or if the limitation on the power to incur debt is approved at the election, the district, during the limitation period, may not issue bonds under any statute or the constitution in excess of the limited amount except to complete construction work for which bonds may be issued within the limitation.
(b) The board shall issue bonds in excess of the limitation to complete these works only after the commission has approved the plans and specifications of the original and uncompleted works together with the estimates of their cost.