You know you need a replacement window but how do you know what size to buy? Proper window measurement is critical to finding just the right fit. Our guide can help..Ordering replacement windows is fairly straight forward if you know how to measure for replacement windows. Measuring replacement windows is very straight forward..Measure the depth of the window if you are installing replacement windows. Measure the depth between the two stops that extend in front of the window frame..To Measure Height Measure from the high point of the sill of your window the surface closest to the inside of the window to the top of the window opening. Make three measurements one at the left side, one at the center and one at the right side of the window..
To Measure Width Measure between the jambs at three points top, middle and bottom of the window opening. Measure from the surface of the jambs, not from the trims or parting beads in your old window opening. Use the smallest of these three measurements to order the window..