Hello Greg, 

I think it’s the same as any other referral- experience with the contractor is what I go on. 

Word of mouth goes a long way.  Ask your previous clients for reviews, and follow up on any posts in your local Next Door app and other online communities. 

I hope this helps! 

Good luck and maybe we can do business together in the future. Also if you know anyone looking to buy or sell, I’m your man!