Impact windows can range anywhere from $40 – $55 per square feet. The range depends heavily on what kind of material is needed for the window. Vinyl or wood can be used as the frame and are inexpensive but not the best quality. Aluminum or steel frames are considered the strongest, but they are also the most expensive. The film of PVB (polyvinyl butyral) or EVA (ethylene-vinyl acetate) in between the two layers of glass also affect the price of the window. They can range from .015 to .090 inches thick. With those materials only, a single hung window can cost between $500 and $600. Depending on the company that installs the window, the average cost for window installations is about $700.