Marge: Hi, Ultrahouse!When a house is alive and has a mind of its own, and can think and act independently. The reasons for this can vary from the house being haunted, being a monster by itself, to the house being robotic. The house may try to kill its owners or may be very helpful with chores. It's usually able to speak, but it doesn't have to. If it's robotic it may have been made to serve its tenants and will make its owners breakfast and dinner and open doors for them. It can also go horribly wrong. Which it does a lot. Different from Smart House in that it must be completely sapient and it doesn't have to be AI that makes the house sapient. In the case that the house is haunted, whatever is haunting the house must be one with the house. They cannot simply inhabit the house. Compare with Sapient Ship and Base on Wheels. Subtrope of Genius Loci. AI examples may overlap with Smart House.
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Ultrahouse: Greeting acknowledged.
— The Simpsons, "Treehouse of Horror XII: House of Whacks"
- The Puppetmon arc of Digimon Adventure ends with Puppetmon using his powers to bring his mansion to life as a fighting machine. Kind of a wooden Humongous Mecha.
- In Cyborg 009, what appears to be a haunted house turns out to be the body of Cyborg 0012, who can see everything and everyone who wanders in. Her walls are blast-proof, she can move rooms around and utilize any weaponry equipped to her, and (as an addition in the 2001 anime) she communicates with guests via a ghost-like hologram.
- Monster House is a perfect haunted house example of this.
- Burnt Offerings, which has a dilapidated house kill people in order to acquire the energy necessary to repair itself.
- In the Sci Fi Channel original movie Habitat, a scientist's experiments in finding a more habitable place for humans to live turns his house into a huge jungle, and then more or less a house-shaped monster that is willing to defend its inhabitants against intruders.
- Nina Kiriki Hoffman's novels A Stir of Bones, A Red Heart of Memories, and Past the Size of Dreaming feature a magical (and benevolent) sapient house. It's haunted, but the ghost is an entirely separate entity from the intelligence of the house itself.
- The Amityville Horror house is sometimes interpreted as this. The below Simpsons example is based on it.
- In The Neverending Story, the House of Change is as instrumental in Bastian's recovery as Madam Eloya and Yor.
- The Shivers novel The Haunting House deals with one of these.
- The Wizard Tower in Septimus Heap is described as a quasi-living object.
- Taliking houses in The Muppet Show. Seen here
- The Addams Family's house appears to be this, at times.
- Rose Red.
- In The X-Files episode "Ghost in the Machine", security system of an office building has developed malevolent sentience.
- Eureka has Jack's house S.A.R.A.H. which has an AI with a mind of its own.
- Baba Yaga's chicken-legged house.
- In the original 1E AD&D module, "I6: Ravenloft", one of the towers in Strahd's castle is alive and will try to knock heroes off its stairs or strike them with the halberds mounted along its walls.
- In The 11th Hour, sequel to The 7th Guest, the Stauf Manor was retconned into being both sapient and evil.
- RuneScape has the Dominion Tower.
- Castle Heterodyne in Girl Genius is an example.
- In Kevin & Kell, Lindesfarne and Fenton's tree house.
- Something Awful: Dungeons & Dragons: The party encounters one fairly early on, which they find out is called Gwendolyn. It alternates between hating them (trapping Joey briefly) and helping them (killing the Doppelganger which had been troubling the party and generally responding positively to Bananaramawicz's attempts at diplomacy).
- The Simpsons:
- In Invader Zim, this happens when GIR gets his mind fused with the house's computer and goes on a rampage through town (with the house transformed into a dog-like mecha) for TACOS. Otherwise, the house computer is an AI itself.
- In one episode of Ugly Americans, the wizard Leonard is assigned to talk down a haunted house into calming its emotional, tenant-killing behavior.