Project Costing: The Importance of Your Quantity Surveyor’s Bill Here’s a lesson that a lot of people need to learn. The bill that is the most important bill in your project is the bill from your quantity surveyor, the one you hired. Those are the ones that are going to give you the most precise estimate of what it will cost you. So anytime somebody comes and they say that their engineer gave them something else, I just look at them and I laugh. Engineer is supposed to give you a quote and you a