The blaze gutted the living room of the woman's home in Oldham, outside Manchester, the Manchester Evening News reported.
Rick Taylor, a fire brigade watch commander, said the woman apparently failed to put the candle out completely when she and her son went to bed. They were awakened by a smoke alarm early Tuesday morning and were able to get out of the house without injury.
Firefighters rescued the family's three dogs.
"The blaze quickly spread from the curtains to the TV and electrics," Taylor said.
Houston died Saturday at age 48 in Beverly Hills, Calif. An autopsy has been performed but no cause of death has been announced.
Scarlett Johansson steps out with fiance after pregnancy reveal
Teacher apologizes for showing sexual image of herself in class