Scotland Yard said the cause of death was not immediately known and that an autopsy would be scheduled. Detective Inspector Mike Christensen said there were no signs of violence in the house.
He said the body was discovered by a family friend, and an ambulance and police were called to the scene.
Ms. Yates was Mr. Hutchence's partner from 1994 until November 1997, when he committed suicide by hanging himself in a hotel room in Sydney, Australia. She had a daughter with him in 1996, Heavenly Hiraani Tiger Lily.
Ms. Yates was also the former wife of pop musician Bob Geldof, with whom she had three children.
"We are all so sad," Mr. Geldof said in a statement. "The loss for all the children is insupportable."
News reports in Britain had said Ms. Yates was treated for depression after Mr. Hutchence's death.
Ms. Yates was a co-presenter in the 1980s on the music show The Tube. She also appeared on The Big Breakfast, an offbeat morning program where she interviewed celebrity guests on a giant bed.