How To Install A New Window In An Existing Wall. Adding windows to existing walls: Enlarging a basement window or putting a new window where there were only cinder blocks can cut a hole in the cinder block wall if you are enlarging an existing wall or putting in a new window.
Some are for new wall construction (called new work) and some are for renovations to an existing wall.
How to cut in a window on an existing wall. Directions will vary slightly from product to product, so always read your installing a window in new construction is easier than putting one in an existing wall, thanks to the fact that you don't have deal with interior wallboard. To build a new window frame in an existing wall, first remove the interior wall covering and any insulation to expose the studs. With assistance, (and the window locked) center the new window in the rough opening and check for sq.