There is lots of general contractor overhead and profit in most situations. Many of the general contractors do not do the work they will contract the work out to others. This way they will get some of the profit and not have to do the work. If you are looking at how much overhead you will really have to look at the information and price it out yourself and that will give you the profit. Make
. sure that you are sure of the profit and then talk to them to try to get the price down. Make sure you understand they do have to pay tax on their profit.