Isolation is a common theme. Just like in a dungeon, the characters in these novels are often cut off from the outside world in the spooky house. Another theme is mystery. There are always secrets hidden within the walls of the house, like what might be in a dungeon. Fear is also prominent, whether it's fear of the unknown or of the things that lurk in the house.
Well, in dungeon house novels, a prevalent theme is that of confinement. The characters are effectively confined to the house, much like being in a dungeon. This leads to a sense of claustrophobia. Another common theme is the presence of the past haunting the present. The house has a history, and often things from the past start to resurface and cause trouble for the current inhabitants. And then there's the theme of transformation. The characters often change as a result of their experiences in the house, just as if they were in a dungeon - like place where they are tested and molded by the environment.
One common theme is the idea of a place having its own power. In a dungeon house novel, the house itself can seem to have a will of its own. It might be haunted or possess some strange force. Also, the theme of discovery is there. The characters gradually discover the secrets of the house, much like exploring a dungeon. And the theme of psychological turmoil is often present as the characters face the horrors of the house and it affects their minds.