rehabber

noun2

1. •
   (informal) A rehabilitator; a person who rehabilitates buildings or animals.

   • At the time, he was a 30-year-old home rehabber and realtor who had worked on several successful projects but had not quite hit the Lincoln Park boom in a really big way. — 1988
2. •
   (informal) One who is in rehab for drug abuse etc.