Hi Raymond. 1st thing is you need to know what your overhead cost is for running your business. Two is you need to charge for your time . We usually charge $50.00 per man for how many hours you will think it will take you. Some jobs we have a flat fee on, other require more work. Other you have to take into consideration site access, and the equipment you will need . Every piece of equipment has a labor charge on it. We give an estimate and usually require a deposit of 1/2 the amount. Customer must also sign the estimate. no check, no signature, no work and move on to the next job. When the job is completed, payment in full on completion of the job. No matter what size it is. Always make sure the customer if fully satisified when finishing up any project.