- Measure the dimensions of your old window. You will have to buy a new window of the same dimensions before you can replace the old one. You need to buy a window that would be a few inches shorter in dimensions than the dimensions of the window opening.
- Remove all the nails and the exterior trim that secure the window with a hammer and its claw. Pull out the old window from the window opening area.
- Clear the window opening area of any kind of debris and loose tools. If the area is not clear, it may obstruct the installation of the new window.
- Set the new window in the window opening area, keeping it at the center of the frame. Fix it temporarily with some retention bands to keep it from moving while you fix it.
- Nail it once you are sure of its position. If the new window comes with a nailing flange, your work gets easier. Nail once every 6 inches starting from the top right part. Measure the window repeatedly while you nail it.
- Cut open the retention bands once you are sure of the measurements.
- Apply caulk on the sides of the window frame to secure it in place.
Things You Will Need
- Measuring tape
- Hammer with claw
- New window
- Retention bands
- Caulking gun
- If after the initial nailing you find the window not to be centered in the opening, remove a few nails, readjust the window and nail it again.