First of all, does he have a active contractor license ?
If so , then you should ask for insurances(Workers compensation, Liability )
& bonds info etc.(You can verify all those information on your state
license board website.)
Experiences is definitely a key point for a competent contractor.(You should
doublt about "说什么他都可以做".)
At least,you should at least get three detailed estimate reports from three
different contractors before you make a final choice.
Normally, the best way to select your co