Mr Rackham said the house had at least one smoke alarm, possibly more.
"At this stage it appears the woman left the house sometime around when the fire started," he said. "I haven't had a chance to talk to her so I don't know if the smoke alarms were activated or if she left because of the smoke."
He said it was hard to understand what had happened without talking to the woman.
"I am hoping to speak with witnesses and that way we will be able to determine the cause."
Mr Rackham said it appeared the fire had started in the lounge and he said it had caused extensive damage to the house.
"Everything in the house has been destroyed, it certainly wasn't a nice way to start the long weekend."
Mr Rackham said he was hoping to determine the cause of the fire in the next few days.