Republic Act 4566 (Contractors’ License Law), as amended by P.D. No. 1746 provides that no contractor, sub-contractor or specialty contractor shall engage in the business of contracting without an existing approved contractor’s license from the Philippine Contractors Accreditation Board (PCAB). All architects and engineers preparing plans and specifications for work to be contracted in the Philippines shall indicate in their invitation to bidders whether they are residents of the Philippines or not. Moreover, a bidder (whether contractor, sub-contractor or specialty contractor) must possess an existing approved license in order to qualify to bid.