A small mistake can cost you hundreds and sometimes thousands of dollars. When you compare how much time you spend estimating a project to how much time you spend performing the labor, estimating takes up a relatively small amount of your time.īut, your decision in these short minutes (or even seconds) will impact your profitability for the entire job. Overestimating is preferable, but can lead to losing customers. If you underestimate a project, you lose money and waste time. The decision about how much to charge is where your profits are made or lost. Why estimating handyman jobs is so important.