What is first tier subcontractors?

First-tier subcontractors are companies or individuals that have a direct contractual relationship with a primary contractor on a project. They are responsible for carrying out specific tasks or providing services that contribute to the overall completion of a project. These subcontractors often manage their own workforce and may also hire additional subcontractors, known as second-tier subcontractors, to assist with specialized tasks. In this hierarchy, first-tier subcontractors play a crucial role in executing the project efficiently and effectively.