Horror Featurette: Dreamhouse (1984)
This is the middle segment of a three-part British anthology feature entitled Screamtime. The first and third stories are terrible, as are the wraparound segments (shot in New York City, probably in the course of an afternoon, and probably by the U.S. distributor to make it more VHS-friendly). But this story is both concise and super-scary, better than anything I've yet seen from boring British shorts of the era like Tales of the Unexpected or Hammer's House of Horror.
Start at 32:00.