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What are the Best Tips for Installing do-It-Yourself Replacement Windows?

By Patrick Lynch
Updated May 17, 2024
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Do-it-yourself replacement windows can be a time and money saver. They are available in various materials but it is important to carefully measure the window frame before ordering them. Other tips regarding installation of replacement windows include ensuring the windowsill is not rotten and all nails in the frame are removed. It is also important to check that the windows are plumb and square and that the new frame has the same slope as the existing windowsill.

The main reason to choose do-it-yourself replacement windows is because they are relatively inexpensive to install. The homeowner is also able to install them from the inside and no exterior trim is required. New replacement windows are energy efficient and can save money each year in energy bills.

Do-it-yourself replacement windows can be built from a variety of materials such as vinyl and wood. They are also available in many styles. Once the style has been chosen, take accurate height and width measurements of the existing windows. Always use the smallest measurements to ensure the replacement windows fit before ordering them.

Make sure that the windowsill does not have any wood rot. It is pointless to install do-it-yourself replacement windows in a frame that is rotten. The window being replaced must have its inside stops and sashes removed. The window frame should be cleaned up with all nails removed from sight by either pulling them out or hammering them in.

Place the new window in the frame to make sure it fits. Remove the window and place a bead of caulk along the outside window stop’s inside edge and windowsill. The do-it-yourself replacement windows must be square. In order to do this, measure both sides of the window diagonally from one corner to the other. Use a spirit level to ensure that the window is plumb.

The inside stops must then be reinstalled using nails of more than an inch in length which must then be set. Be sure to caulk the area where the inside stops meet the frame. Once this is completed, go outside for a final check of the new windows.

Since windowsills have different slopes, it is important to purchase do-it-yourself replacement windows with a frame of the exact same slope as the windowsill. If there is a gap, however, the new windows should have an insert to cover it. Should they be devoid of this feature, use a piece of wood to deal with the gap.

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