To stop, in the choice of workers, you need to be on those whose result they themselves saw. Yes, and blindly trust the advice of friends and acquaintances, too, it is also not worth it because everyone has their own quality criteria. After all, it has already been tested in practice, what one likes can not like the other at all. Therefore, it is better to give their preference to builders who are already finishing their work. You can agree with them on the repair by looking at the work of these specialists.