One of the first decisions in a window replacement project is whether to install insert windows into the existing frames or replace the full frame down to the rough opening. The right choice depends on the condition of your current frames and what is happening in the wall around them.
An insert window fits inside the existing frame. Interior trim and exterior siding usually stay in place, which keeps disruption low. This works well when the existing frames are square, solid and dry.
Full frame replacement removes the whole window down to the rough opening. It allows the installer to inspect for rot, add new flashing and insulate the gaps around the frame. It makes more sense when frames are soft, out of square or showing water damage.
Whatever the type, the window should be set level and square, insulated around the gaps without bowing the frame, flashed or sealed to shed water, and finished with trim that ties cleanly into your siding.
If you are also replacing siding, full frame windows can be flashed directly into the new house wrap. That is one of the best times to replace windows. If drafts are your main concern, see our guide on drafty windows and cold air in winter.
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