Subcontracting in the construction industry can add cost and would be time consuming:

Increased Costs: While subcontracting can be cost-effective for certain tasks, it can also lead to increased costs. Managing multiple subcontractors can be complex and time-consuming, which may require hiring additional project management staff.

Overhead Costs: Each subcontractor typically adds their own overhead costs, such as administrative expenses, profit margins and insurance. These costs can add up and make the project more expensive than if it were self-performed by the contractor.

Coordination Expenses: Coordinating the activities of multiple subcontractors can be challenging. It may lead to additional expenses related to project delays, communication issues, and disputes that need to be resolved. These delays can result in additional costs due to extended project timelines.

Quality Control Costs: Ensuring that subcontractors maintain the quality standards expected by the client can be costly. It may require additional quality control and inspection measures, which can increase project costs.

Risks of Unforeseen Changes: Subcontractors may encounter unforeseen conditions or issues during their work. While change orders can help address these, they often come with additional costs and may lead to disputes if not managed properly.

Lack of Cost Control: Subcontractors may have limited visibility into the overall project budget. As a result, it can be challenging to control costs effectively, and cost overruns can occur.

Legal and Contractual Costs: Developing and managing contracts with subcontractors can be costly. Legal fees may be required for drafting, reviewing, and modifying contracts. Additionally, disputes and legal actions can result in substantial legal costs.

Project Delays: Subcontractors might have other commitments, and their availability could lead to project delays. Delays can escalate costs due to extended labor and equipment rentals.

Dependence on Subcontractor Performance: The overall success of the project can be highly dependent on the performance of subcontractors. If a subcontractor fails to meet deadlines or quality standards, it can lead to costly rework or penalties.

Safety Costs: Ensuring the safety of subcontractor employees and compliance with safety regulations can be an additional cost. Safety inspections, equipment checks, and safety training may be required.