::A basement window installer is a person who installs windows in basements and ground-floor windows, as well as in some wall openings. Basement window installers are usually called upon to replace or repair windows that have been damaged or broken by storms or other natural disasters. Basement window installers typically work with wood, vinyl, and metal sashes. They must be able to cut and fit these sashes into the opening of the window frame. They must also be able to install weather stripping around the perimeter to prevent water from entering the house during rainstorms.