The responsibility for quality control of the work performed lies primarily with the:

The responsibility for quality control of the work performed primarily lies with the contractor because the contractor is directly responsible for the execution of the construction project. They have the primary role in managing all aspects of the construction process, including adherence to specifications, standards, and industry practices. This encompasses not only the materials and methods used but also the overall management of the project to ensure that the quality of work meets the requirements set forth in the contract documents.

The contractor typically has a quality control plan in place that outlines procedures and criteria to maintain quality throughout the construction phase. This plan includes the inspection of work, testing of materials, and implementation of corrective measures when necessary. By having the contractor lead the quality control efforts, it ensures that there is a single point of accountability for the quality of the work, facilitating better communication and efficiency in resolving any issues that arise during construction.

While the consultant, performance tester, and subcontractor all play roles in quality assurance, they do not share the same level of overarching responsibility. The consultant may provide oversight and expertise, the performance tester evaluates certain specific building systems, and the subcontractor executes a portion of the work but all under the contract and oversight of the primary contractor, who bears the overall responsibility for ensuring that the quality standards are