External supervision of a construction project is a process in which an agent hired by the owner of a construction project verifies that the contractor complies with the requirements, specifications and deadlines of the work.

The external supervisor acts as an impartial intermediary between the owner and the contractor, and his main functions are:

Monitor and verify that the works are carried out in accordance with the plans, technical specifications, quality standards and safety regulations.

Ensure that the work is carried out as planned and within budget.