When replacing windows, you should always have a professional take measurements before making a purchase. That being said, if you’re interested in measuring sliding windows, please follow the instructions below:
Remove your sliding window sashes from the window frame and place them carefully on the ground or in a safe place.
Begin by measuring the width of your window frame, specifically the space between the window jambs on either side.
Next, measure the height of the windows, at the most narrow point.
Finally, measure the window depth by taking measurements of the space between the outer and inner window stops.