Select a Replacement Kit
- Measure the existing window sash width from inside one side jamb to the other.
- Slide the tape measure between the sashes to measure from inside the head jamb (upper rail) to the inside of the sill. This is the sash height.
- Record the jamb depth measurement.
- Take these measurements to a hardware store or specialty window retailer to find a replacement kit.
Remove the Existing Window Sash
- Twist the lower sash to lift it out of the window.
- Pry out any inside stops (between the sash and the jamb) using a pry bar.
- Remove the upper sash.
- Detach the existing side jambs and jamb hardware with appropriate screwdrivers and pry bar if necessary.
Install the Window Sash Replacement Kit
- Screw the new metal jamb brackets into place in the window frame.
- Affix the new jamb liners and jamb hardware to the jamb brackets.
- Install any specialty or optional hardware included with the kit according to instructions.
- Slide the new upper window sash into the outer jamb track.
- Lift the new lower sash into the inner track.
- Reinstall any inside stops with nails.
Things You Will Need
- Tape measure
- Protective glasses and clothing
- Pry bar
- Window sash replacement kit (see Section 1)
- Donate your old windows to an architectural salvage store.
- If desired, prime and paint the new sashes prior to installation.
- Use wooden sash kits to maintain an historic appearance on an older home.