An installation kit for a pre-hung door assembly having a door frame and a door. The kit comprising a plurality of door frame brackets for attaching the door frame to an opening in a wall in which the pre-hung door assembly is to be installed, a plurality of door brackets adapted to be attached to the door and to the door frame, and a lockset bracket adapted to be attached to the door and to the door frame. The door brackets and the lockset bracket being operable to fix the door in relation to the door frame and the door frame brackets being operable to fix the door assembly relative to the opening.