A dual function lavatory door and methods are presented. A hinged door panel comprises a doorway hinge coupled to a first side of a lavatory doorway of a lavatory. The doorway hinge positions the hinged door panel to couple to a first interior side-wall of the lavatory in a deployed position. An extendable door panel is coupled to the hinged door panel by a vertical hinge and can couple to a second side of the lavatory doorway opposite to the first side. The extendable door panel folds along the vertical hinge into an interior space of the lavatory in the deployed position. An extension panel is coupled to the extendable door panel and extends from the extendable door panel to couple to a second interior side-wall of the lavatory opposite to the first interior side-wall in the deployed position.