The East Haven home was demolished Wednesday morning. A neighboring house also struck by the plane was knocked down last week.
A 10-seat plane approaching Tweed New Haven Airport crashed into the houses Aug. 9. Thirteen-year-old Sade Brantley and her 1-year-old sister, Madisyn Mitchell, died in their home. Their mother survived.
The crash also killed the plane's pilot, Bill Henningsgaard, and his 17-year-old son, Maxwell, of Medina, Wash.
The cause of the accident remains under investigation. The National Transportation Safety Board has issued a preliminary report saying a witness saw the aircraft traveling upside-down as it sped nose-first toward the ground.