Arnprior Fire Dept responded to an early morning fire on William St in Arnprior Friday.
Crews responded at just before 3AM to reports of a possible fire.
Upon arrival the rear of the structure was fully involved in fire.
The two occupants of the residence escaped uninjured after being awakened by sounds of the fire and then their alerted by their smoke alarm.
Twenty-Three members of the Arnprior Fire Department responded to the call and crews were on scene until late morning.
Due to the extensive damage cause by the fire, the homeowner and her young son have been displaced from the home, and are currently staying with local family members.
Cause of the fire has not been determined.
Fire Department release