The Collaborative International Dictionary of English v.0.48:

maintenance man \maintenance man\ n.
   A worker, usually in an enterprise or apartment building,
   whose job is to repair damaged parts of a building or its
   fixtures, and sometimes to make improvements or other changes
   to the building.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

maintenance man
    n 1: a skilled worker whose job is to repair things [syn:
         repairman, maintenance man, service man]