How To Replace a Window Sash

The window sash is the part of the window that you can raise in order to open it vertically. Some windows only have one window sash while others may have more than one. The window sash fits directly into the sliding track of a window frame. In order to replace a window sash, you can buy replacement kits that come with the sash and the jamb components you need for your particular window style.

  • To replace a window sash, you will need the following tools and materials:
    • Measuring tape
    • Angle finder
    • Window sash replacement kit
    • Hammer
    • Screwdriver
    • Nails
    • Pry bar
    • Work gloves and safety goggles
  • Measure the window sash. Using your measuring tape, get the width of your window sash. Measure the distance from the inner side of one jamb to the opposite jamb. Next, get the height. While the bottom sash is open, slide your measuring tape inside the frame.  Measure from the head jamb down to the window sill where the exterior side ends. Finally, measure the angle of the window sill using a small angle finder. You will need all three measurements for the next step.
  • Buy a window sash replacement kit. Go to your local hardware store or to a specialty window store and find a replacement kit. The kit you choose should match the measurements of your existing window sash. Make sure the contents of the kit are complete. Read the instructions that came with the kit so you know if you need additional tools or other materials.
  • Take out the current window sash. Lift out the window sash by twisting the lower portion of the sash. If there are any stops found between the window sash and the jamb, pry these out first. A pry bar can be used to do this. Take out the upper window sash. Using a screwdriver and a pry bar, remove the side jambs and any jamb hardware. At this point, you may want to remove any dirt or debris left over after removing the existing window sash.
  • Mount the new window sash. Using your screwdriver, screw-in the new jamb brackets into the frame of the window. Attach the jamb liners and the other jamb hardware to the newly installed jamb brackets. If there is any other hardware that came with the replacement kit, install them by following the manufacturer’s instructions. Slide in the upper window sash right into the outside jamb track. Install the lower sash by lifting it into the inside jamb track. If there are inside stops that need to be reinstalled, use your hammer and nails to reinstall these stops.


  • Don’t forget to wear your safety goggles and work gloves when replacing a window sash. These should protect you from splinters and other dangers that may affect your eyes and hands while working on the window sash.
  • Painting of the replacement window sash should be done before you install it.
  • Some windows come with pulleys and cords as well as weights. Follow the instructions found inside the window replacement kit when replacing this type of window sash assembly.
Instead of replacing the whole window, you may opt to replace just the window sash. It is easier to replace a window sash because you can find replacement kits at hardware stores and from other sources. Get help from a friend to make the work easier to complete.


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