Fire investigators are still investigating, he said.
The other occupant has not yet been accounted for.
The house has been "completely destroyed".
Neighbour Gwen Gordon said she had seen the couple aged in their 80s, were house-sitting for their son who lived in Australia and had only been at the property for three months.
The couple's vehicles at the house and she thought they would have been inside it last night.
"They were just lovely, it's terrible," she said.
Uawa Parade resident Delys Hooper said the house which burnt down was old but recently renovated.
"They'd done it all up, renovated it and cut down all the trees. It was looking flash as. It's just horrible.
"I woke up when I heard all the sirens and went out the front of my house and couldn't see anything except the smoke. Then I went outside and just saw all the flames, it was huge."
Police and the Fire Service had been at the house all morning.