The fire department is investigating an early-morning blaze in the Bayshore area.
It happened at 870 Roseview Ave., near Bayshore Drive and Carling Avenue, just after 5 a.m. Monday.
No one was home at the time, firefighters said.
The flames are believed to have started in the basement, then spread up through the ceiling onto a porch at the rear of the home.
The blaze was extinguished by about 6:30 a.m.
An investigation into the cause of the fire is ongoing.