When your do and estimate for a customer, main on hardscaping project apposed to lawn care, how often does your estimate match your actual invoice? On a few of my latest projects ive under estimated by about 10%, some costs due to unexpected equipment issues, some due under labor estimation. Some costs, I will eat if its a simple oversight on my part, but the labor costs I have to pass on to the customer. Needless to say, they dont like it. But if I spend 28 hours on a job and not 20 like estimated, then the bottom line is I spent 28 hours doing the job. I have to pay my guys, so I need to get paid for their work.