Doing mulch install, basic edging, clean up, etc. I usually charge by the yard. Around $100 or so. Everything included to come up with my estimate. This usually works just fine but occasionally I have run into unexpected problems that cause the job to go over budget and I don't make the money I should. I have been thinking of changing the contracts to charge customers (for the final bill) by the cost of materials + the amount of man hours. If I do it this way I think I can really never screw myself. Granted sometimes I over estimate a job and make some decent cash, but I think I would rather be getting my moneys worth for every job. Before I begin a job, the customer would have a full understanding of how the final bill will be calculated. I would probably continue to calculate my estimates by the yard because it is fairly accurate. But the final bill would be materials + labor = final cost before tax. Does anyone do it this way and how does it work for you?