The Treehouse is the home of Lock, Shock, and Barrel, Oogie Boogie's three henchmen. Its location is just outside Halloween Town on the farside of the Graveyard Hill. The tree is in the middle of a pit that makes up part of Oogie's Lair. A small rope bridge leads to a cage shaped elevator that carries the three up into the house and the chute (designed with broomstick eyebrows, swirl eyes and a monster mouth drawn in chalk giving it a scary look) inside leads to his lair which they use to send items or victims such as Santa Claus down through it.
The house itself is the setting of the song Kidnap The Sandy Claws, and is loaded with bugs and torture devices. This includes bear traps, spiked clubs, axes, poison, a bathtub with legs, a catapult, and many other "toys".