An urn vault includes a base and a top portion which has one or more side walls, wherein the side walls protrude downward. Each opposing side wall is bonded length-wise to each adjoining side or to itself, creating a seamless cast top portion open at the bottom that lowers onto the base. Attached to the base are guide rails, bonded equidistant from the outside base edge on all sides of the base. This “rail system” is the fastening guide for the top portion which lowers onto the base, wherein the inside of the side walls interact with the outside edges of the four guide rails. In certain embodiments, the urn vault may be comprised of one or a combination of polymers. A system and method are further included.
