Who is responsible for all pipe connected to the sprinkler system, including underground work?

The contractor is responsible for all pipe connected to the sprinkler system, including any underground work. This role involves overseeing the installation and ensuring that all aspects of the system meet building codes and specifications. The contractor coordinates with various trades and ensures that the sprinkler system is properly integrated into the overall building project. This responsibility includes managing the work of subcontractors, obtaining necessary permits, and performing inspections during and after installation to confirm compliance with safety standards.

In this context, the contractor's direct involvement with the physical installation of the piping and the adherence to regulations makes them the key figure accountable for the system's integrity. Other entities, such as the architect, engineer, or owner, may have important roles in design, planning, or funding, but the contractor has the primary responsibility for the execution of the work on-site.