Const. Fiona Thivierge said the bodies were found at the residence on Hinchley Wood Grove after police got a call shortly after 10:40 a.m. regarding the well-being of an individual from a family member of one of the victims.
The person named in the call was among those found dead.
All of the victims were adults, police said.
The homicide squad was called to the scene and officers are currently canvassing the neighbourhood for any potential information.
Police did not have any further information about the identities of the victims, but told CBC News that it may have been a murder-suicide. Investigators are currently awaiting the arrival of the coroner, who will work the forensic investigations team to determine time and cause of death for each victim.