When I started (22 years ago), there was no licensing or any other requirement in any state. After a career of supervising all phases of major construction and high-end restorations, I VOLUNTARILY did ride alongs, then supervised inspections, in an amount that exceeded 100 before I would even consider doing one on my own. Even then I didn't have any qualification on paper until I had 250 inspections, passed a proctored exam, had reports reviewed, and did a pier review - all requirements for ASHI membership at that time. I still felt less than qualified to do this gig competently for about another 2 years.