My dad recently had a guy in to repair the chimney, and he quoted a specific amount for a basic repair. After he started working on it, it became obvious the chimney needed much more extensive repairs, and he gave my dad a new quote, which they agreed on. My dad was in the US for most of the time the repairs were being done, and the guy has now given him a bill that's $1100 higher than the quote, saying he had to do "extra work" and my dad wasn't available to discuss it (though my mother was here the whole time). He also hasn't done a couple of minor jobs he agreed to do at the same time.
As far as I can tell, he doesn't have a leg to stand on since he gave us a quote, but I just wanted to check with other people. I'm located in Ontario, by the way.
Chris