W. Va. Code § 30-42-12: Notice included with invitations to bid and specifications.

Any architect or engineer preparing any plan and specification for contracting work to be performed in this state shall include in the plan, specification, and invitation to bid a reference to this article informing any prospective bidder that the person’s contractor’s license number must be included on any bid submission. A subcontractor shall furnish that person’s contractor’s license number to the contractor prior to the award of the contract.