How to Measure For Replacement WindowsWidthMeasure between the jambs at the top, middle and bottom of the window opening. Use the smallest of these 3 width measurements to order the window. HeightMeasure from the high point of the sill of your window (the surface closest to the inside of window) to the top of the window opening. Take a measurement at the left side and the right side. Use the smallest of these 2 height measurements to order the windows DepthThere must be at least 3 ¼” of opening depth between the inside window trim and the outside blind stop strip. |