I still don't really understand what you're saying. Yes, I agree isolation valves are good. But as far as what code requires? It seems that if isolation valves

I still don't really understand what you're saying. Yes, I agree isolation valves are good. But as far as what code requires? It seems that if isolation valves aren't required on branches, then the only isolation valve that is required is the main house valve that can isolate it from the street water main. So I can't figure out what else you think would have been required to pass inspection in the comment you originally responded to.