Police are treating a blaze inside a Dapto home on Wednesday morning as suspicious.
Several residents were forced to flee the burning Fowlers Road home as it quickly became engulfed in flames.
Fire and Rescue NSW crews were called to the fire about 4.20am, arriving to find the house well alight.
Crews from Unanderra and Dapto fire stations managed to contain the blaze from outside the building before heading inside to extinguish smaller flames.
All the home's occupants managed to flee the building through a bedroom window.
No-one was injured.
The fire was contained to the kitchen and lounge-room but the house suffered significant smoke and water damage.
Fowlers Road was closed for several hours while crews worked to contain the blaze.
Lake Illawarra police are treating the fire as suspicious and are continuing to investigate.