New Jersey Statutes Title 18A. Education 18A § 18A-26

Every board of education shall require that all persons proposing to bid on any contract requiring public advertisement for bids with the board for public work, the entire cost whereof will exceed $20,000.00, shall first be classified in accordance with article 6 of this chapter  1 as to the character and amount of public work on which they shall be qualified to submit bids. So long as such requirement is in effect, the board of education shall accept such bids only from persons qualified in accordance with such classification.