203(k) renovations are complex. Fixer-uppers, in general, need a greater number of complex repairs than other properties, so you will need a contractor who understands how to renovate a home essentially from scratch. Ideally, they should be confident in their ability to take the house down to the studs and start over. In addition, your contractor needs to understand and abide by the loan requirements and your lender. Look for a contractor with experience handling multiple major rebuilds and 203(k) renovations specifically.