Abstract: An apparatus for installing a pre-hung door unit including a door frame having an inwardly facing portion accessible from an outside facing side of the door unit and a door hingedly connected to the door frame. The apparatus includes a body having door edge portion connecting provisions for removably connecting the body to an edge portion of the door and frame connecting provisions connected to the door edge portion connecting provisions, for removably connecting the body to an inwardly facing portion of the door frame. The door edge portion connecting provisions include a door edge connecting portion having a first surface for contacting an edge surface of the door and the frame connecting provisions include a frame connecting portion having a second surface operable to contact a surface of the inwardly facing portion of the door frame.