The disclosed urn vault comprises a polymeric box having one or more side walls and either a top or base. In some embodiments, the polymeric box is open at the bottom and lowers onto the base. In some embodiments, the polymeric box is open at the top, and a lid lowers onto the polymeric boxs top opening. In some embodiments, the top surface of the base comprises guide rails or channels, located equidistant from the outside base edge on all sides of the base. These guide rails or channels are the fastening guide for the polymeric box, which lowers onto the base. In some embodiments, the lid comprises a top lid panel coupled to a smaller bottom lid panel. The lid lowers onto the polymeric box, and the top lid panel and bottom lid panel engage with the side walls of the polymeric box.
