The Collaborative International Dictionary of English v.0.48:

Restorer \Re*stor"er\, n.
   One who, or that which, restores.
   [1913 Webster]

WordNet (r) 3.0 (2006):

restorer
    n 1: a skilled worker who is employed to restore or refinish
         buildings or antique furniture [syn: refinisher,
         renovator, restorer, preserver]