Beloit firefighters say a residential fire at 2644 Butlin Court was caused by the fireplace overnight.
Responders received the call before midnight Saturday night. When they got there, fire was heavy smoke was showing from the back of the house.
The four people inside the home all got out safely. The fire started in the living room of the home then spread through the kitchen and attic.
In all, $55,000 in damage was caused.