Arsonists were blamed for causing a fire at a home in Rawmarsh.
Firefighters were called to the scene on Dawson Avenue at about 9pm on Saturday night.
A brigade spokesman said the fire was started around the cat flap of the back door/
He added it was impossible at this stage to say wether someone had tried to push a lit object through the flap.
The occupants, a man and a woman, were out at the time.
Three fire crews from Rotherham and Dearne stations spent over an hour tackling the blaze.