Proper prediction of the labor cost common denominator to any plumbing business as it has a straight impact on the business’s profitability and customer satisfaction. Human resource is usually a major cost factor in plumbing and any mistake, either thru under or over estimating the total working time required, may pose definite problems to project profitability or awarding of competitive bids. To simplify the process for you, we are sharing professional tips on what you should and should not do while calculating labor costs on a plumbing estimate. By taking into account, for example, the skill level, job complexity, and time, you will always provide as accurate as possible estimates.