"I was sitting at my desk on the computer, and I heard a bang, and the house shook and it kind of felt like a jet flew over, like a sonic boom," said Fontana resident Mike Sninjders.
One woman was inside the home at the time of the fire. Falling debris woke her up, and she scrambled out of the house, escaping just in time.
Firefighters knocked down the flames in less than an hour. They believe a heater caused the explosion by igniting gas in the attic.