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Shorter Slide In Replacement Window?

I have the need to replace an old, single-pane window with a new, shorter window. Is it possible to use a slide in replacement window, moving the old sill up to the proper height? Should I tear everything out and just install a new windows? Any thoughts, tips would be appreciated. My initial thought for a shorter replacement window is to remove the old sashes, carefully remove the old sill, frame in the new bottom of the windows with some 2x4's, fill in the new gap at the bottom of the window, install the slide in window, and alter the old sill to fit the new window. I should also note that I am going to have to replace the drywall in the interior.

Public Comments

1. I depends on outside finish. Drywall is the easy fix. You don't want exterior leaks... Replacements are fine and available in your custom size. New windows are in specific sizes and might not fit your opening. New are installed from the outside and replacements are installed from inside.