Width: Using a wood or steel measure, measure the exact distance between the window opening at three different places – top, middle and bottom. Measurements should be taken within the window jamb.
Use the smallest of the three measurements. We will make the necessary deductions to fit the window opening.
Length: Measure the length of the window opening from the underside of the soffit to the surface of the window sill in two places. Use the smallest of these two measurements.
Width & Length: Measure the exact width and length to be covered. On the width, allow at least 2″ of an overlap on each side. An overlap of 3″ on each side is recommended.
Be sure to take into consideration any trim, molding, locks and cranks.