I've used the same plumber as my sub for almost 2 years and never had any complaint about him. I always thought his pricing was fair and I never beat him up on his prices. I never shopped around for other quotes because I trusted that he would give me a fair price. For the past 5 projects in a row he has hit me with change orders on every job sometimes even 2 or 3 in one project. I mentioned this to him and his words were you can't account for unforeseen circumstances. I just don't understand because I always schedule a site visit and always give him a detailed report with pictures and plans. Can someone offer some advice.