Abstract: Disclosed is a method for installing a window or other fenestra-mounted object between joists in a structure having a ceiling. The method for installing a fenestra-mounted object into a structure having a ceiling supported by joists, comprising the steps of: creating a void between two joists of the structure, with at least some portion of the void being above the plane of the bottom of the joists; creating an opening in an exterior covering of the structure aligned with the void such that light or air external to the structure may enter the structure through the opening and the void; and installing a fenestra-mounted object in the void. Trim or a preformed trim component may be installed around the interior and exterior portions of the fenestra-mounted object to give a finished appearance.