Items required to complete the construction project (eg, labor, equipment, materials) are procured during the procurement phase. In keeping with the contract, an agreement is reached between the owner and the seller. The agreement is known as a purchase order. The purchase order ensures that the purchased product meets the required specs for the agreed price.
If your general contractors do all their construction work, the company will be able to manage the procurement phase on its own. Otherwise, they can use subcontractors. Sub-builders specialize in a specific part of a construction work (eg, concrete, wood, glass). Subcontractors, along with the general contractor, are hired during the bidding process.