Before you construct a window-replacement estimate, it's important to have an over-all idea because to where you intend on making a purchase. br br Big-box stores may be the best option if you don't want to get "hands about. " These stores will generally have fair rates for material and great insurance, but the commission rate and installation costs can be high. br br Depending on weather or preferences, there will be several different types of windows, each of which usually features its very own set of attributes.