Which role is responsible for overseeing an entire construction project?

The general contractor is responsible for overseeing an entire construction project. This role encompasses managing the overall operations of construction, including coordinating between various subcontractors and suppliers, ensuring compliance with safety regulations, managing budgets, and adhering to timelines. The general contractor is the primary point of contact for the client and is accountable for delivering the project according to contractual obligations and design specifications.

In contrast, a subcontractor typically handles specific tasks or specialized work within the project, like electrical or plumbing work. An architect focuses on the design and planning aspects, ensuring that the vision and functional requirements of the project are met. The site manager supervises day-to-day operations on the construction site but typically reports to the general contractor. Thus, while all these roles are vital, the general contractor's comprehensive oversight of the entire project is what distinguishes it as the correct answer.