N.D. Cent. Code § 43-07-12
All bids and proposals for the construction of any public contract project subject to this chapter must contain a copy of the license or certificate for the current contractor year of the license issued by the registrar, enclosed in the required bid bond envelope. A contract may not be awarded to any contractor unless the contractor is the holder of a license in the class within which the value of the project falls as provided under this section. A contractor must be the holder of a license at least ten days before the date set for receiving bids, to be a qualified bidder. A bid submitted without this information properly enclosed in the bid bond envelope may not be read or considered and must be returned to the bidder. This section does not apply to bids submitted:
N.D.C.C. § 43-07-12