anyone have an idea of what an average size car garage door would cost. The builder is charging us for putting in a window, but he has not given us any indication of what he would have allowed for the garage door. Just want a ball park figure. As all of the houses in the estate over the 10 years chose to have windows, patio doors and the like instead of a garage door we do not know what the allowance is. The builder is very uncooperative.