Whenever a new institution shall have been completed in a county, the commissioners shall certify the fact to the court of common pleas of said county, whereupon said court shall appoint three competent and disinterested persons, as viewers, to view and thoroughly examine said buildings, and report to the court whether the said contract or contracts have been faithfully and fully performed and completed, and until such report be so made final payment on said contract or contracts shall not be made. The said viewers shall be entitled to a sum not in excess of ten dollars per day, for each day necessarily engaged in the performance of their duties, as the court shall determine, to be paid from the funds of the institution district.