The fire happened at around 2:00 a.m. Wednesday morning at 30 Hazel Dell in Springfield.
Firefighters say the owners were asleep upstairs. They escaped out of an upstairs window but because construction was being done on the house, they were able to climb down a ladder.
Investigators arrived on the scene around 3:30 a.m. to determine the cause. Firefighters say the damage to the original part of the home is extensive.
No one was injured.