Vinyl-lined in-ground pools are similar to above-ground pools, structurally, but they look more like conventional in-ground designs. The construction crew digs a hole and assembles a metal, plastic or wood frame wall around the hole’s perimeter. As in an above-ground pool, the crew lays sand along the bottom of the hole and secures the vinyl lining to the structural wall. These pools are less expensive than other in-ground designs, but not as durable. Typically, the liner needs to be replaced approximately every 10 years or so.