A contractor is in charge of the whole project and a builder or a worker does a special task such as carpentry or plumbing. The contractors do not undertake the physical construction of the things but put the entire process in order. They employ and manage builders, electricians, plumbers as well as other experts. Consider a contractor just like a coach of a sports team, he is the one who designs the strategy, selects individuals in the team and ensures that everybody is performing so that they (the construction project) win.
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