Managing risk is part of a general contractor’s job. Whenever they bring on a new subcontractor, they are also taking on risk. For this reason, the agreement you sign with a contractor may prohibit certain activities, including barring subcontractors from hiring their own subcontractors. If you are a subcontractor, check your contract before hiring another subcontractor. Even if it is allowed, it may not be the best course of action. You might want to speak with the contractor who hired you or the project manager to work out issues regarding potential delays and lack of skill or expertise. You might find that further subcontracting is not necessary or that the general contractor prefers to hire additional subcontractors themselves.