I go on customer visits to give estimates quite often. If I'm going to be more than 3-4 minutes late I call to give the customer a heads up. They always seem to appreciate it.
I had a guy come out today, who called and apologized because he was going to be 10 minutes late. No biggie, but I did appreciate him letting me know. I've had guys that never did show up or bother to call. I understand things come up, but a phone call sure might save a getting some work.
