The last sequel in the House film series, released in 1992 straight-to-video.
The film opens with Roger Cobb (yes, the protagonist of first film) and his family checking out the house his father left him with. Roger's step-brother Burke tries persuade him to let him have it for making some profit, but Roger decides to keep the house as it is due to an old promise made by his ancestor to the local Native Americans. But on the way back home, the Cobb family's car crashes and Roger is engulfed in flames. Some time later his wife Kelly and daughter Laurel move to the old house, deciding to start a new life in there. But Burke is hellbent on getting the property, and seeks to drive them out. The supernatural forces rampaging in the house doesn't help matters either.
House IV has the examples of:
- Angry Guard Dog: Laurel's dog-lamp turns into a real dog to chase away Burke's goons.
- An Arm and a Leg: The explosion in the car takes all of Roger's limbs.
- Ashes to Crashes: Kelly has a vision of her husband's toppled ashes, and a hand rising from it to grab hers.
- Back for the Dead: Roger Cobb is the Decoy Protagonist and dies a third of the way.
- Batter Up!: Burke's goons visit the house masked and armed with baseball bats to scare Kelly and Laurel out of it.
- Big Bad: Burke, who is also the sole living main villain in the House series.
- Engineered Public Confession: Burke is caught when he confesses his misdeeds to FBI, whom Roger made appear as his boss Mr. Grosso.
- Flashback Nightmare: Kelly has nightmares about the car crash that killed Roger.
- Happier Home Movie: A projector turns on randomly, showing Kelly a home movie from the past.
- Flatline: Shown when Roger's life support is cut.
- Mister Big: Mr. Grosso, the Corrupt Corporate Executive who seeks to claim the property through Burke.
- The Mole: It turns out the maid was an undercover FBI agent sent to keep an eye on Kelly and Laurel while investigating her brother-in-law.
- Phlegmings: Due to all the toxic waste around him, Mr. Grosso has developed a serious phlegming problem and needs a specific "phleg-o-matic" to pump it out of his throat.
- Shower Scene: Kelly takes a shower and unbeknowest to her, she is actually showering in blood.
- Super Window Jump: Burke's goons escape the lamp-dog by jumping through a window.
- Suspiciously Specific Denial: Grosso's barrels of "Non-Toxic Waste".
- Toxic, Inc.: Mr. Grosso's company produces a lot of toxic waste. The reason that Burke and Grosso's flunkies try to claim the main setting is to dump it there.
- What Happened to the Mouse?: Roger's son from the first film, as in the one who was driving force in its plot, is nowhere to be seen.