Retrofit vs. Full-Frame Replacement
Within the replacement category, there are two installation methods. A retrofit
(or insert) installation fits the new window inside the existing frame, preserving the
original frame structure. This is the faster, less invasive option and works well
when the existing frame is in sound condition. A full-frame (or brick-to-brick)
replacement removes the entire old window including the frame, allowing the new window
to be installed directly into the rough opening. This method is more
involved but provides the opportunity to inspect and address any hidden damage,
improve insulation around the opening, and in some cases accommodate a larger
glass area.