Wiktionary
n. A contractor hired to manage a project and to hire subcontractors. (If a customer serves as their own general contractor then this means they undertake the management tasks and the hiring of subcontractors.)
Wikipedia
A general contractor (main contractor, prime contractor) is responsible for the day-to-day oversight of a construction site, management of vendors and trades, and the communication of information to all involved parties throughout the course of a building project.
Usage examples of "general contractor".
One minute he was an architect, the next an electronics engineer, and finally a general contractor as he single-handedly directed the emergence of the lab.
It is not only a strain on us-Ginny in particular, since she has to put up with the primitive housekeeping and cooking facilities of this summer cabin-but also it has had a very bad effect on our general contractor.
Apparently he worked as a general contractor for the last eight or nine years and was laid off a few months ago.
Julie's six feet under in Pasadena and I'm a general contractor in safe, pastoral Charlottesville.
Her general contractor, Mike Moscowitz, had introduced her to most of the subcontractors, but not to this one, who looked awfully young to be the boss of the framers.
Subarashii was the general contractor for the elevator, but Praxis was supplying the software as they had for the first elevator, and also some of the cars, and part of the security system.