Typically, there's a general contractor who is responsible for coordinating the efforts of all the different contractors: an architect to draw the plans, an earth-moving company to dig the foundation, a plumber, a carpenter and so on.
Normalement, une entreprise générale est responsable de la coordination des efforts entre les divers sous-traitants : l'architecte qui dessine les plans, le terrassier qui va préparer les fondations, le plombier, le charpentier, etc.