contractor

noun4

1. •
   A person or company that builds or improves buildings or structures.

   • Two days later, walking beyond the usual limit of the conventional promenade, Carrados reached a rough wooden hut such as contractors erect during the progress of their work. — 1923
2. •
   A person or company that performs specific tasks like electrical or plumbing work in construction projects.
3. •
   A person or company hired to maintain existing facilities like air conditioning systems, groundskeeping, etc.
4. •
   A person hired to do a job on a business contract, as opposed to a permanent employee.

   • It looks like you're off to a three-hour staff meeting that doesn't apply to me. I'm glad I'm a highly-paid contractor. I'll be increasing my skills while you fight to get oxygen to your brains. — 1994