i bid on a high school last month and whittled my bid down from 400 to 315......looked at it every way possible and only went that low to try and get my foot in the door for some other work.....winning bid was 250.......some of these companies hire cheap cheap labor and work them till they quit and then replace them with more.......there is no other real way to look at doing a job that big for as cheap as they bid it