I would ask them for referrals from past projects. I would also want to know the status of their license (if your state requires builders to be licensed) or if they are certified.
Go to your state's Better Business Bureau and see if they have a file.
Sometimes, the inside lender will pay part of your client's expenses if you use them. If the lender offers no money for expenses, have your buyer shop around.
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Greg Sargent
Licensed Georgia Real Estate Broker.