A window buck is a temporary box installed within a block wall to block out the space where a window will eventually be installed. A door buck is similar but, obviously, in place of a door.
Ours were installed. Looking good.
The girls’ reactions on seeing their bedroom windows were delightful. The basement windows, by design, are large and will provide a nice view of the (gorgeous!) backyard and give plenty of natural light.
The love their rooms and are getting excited for the move!