Fire and Rescue NSW (FRNSW) were called to a property in Michael Avenue just before 2am, with the first crew reporting thick smoke and flames in the front rooms of the house.
They worked to extinguish the blaze, while neighbouring residents were evacuated as a precaution.
Firefighters attacked the fire which went through the roof but managed to contain it within 45 minutes.
There were no reported injuries.
Anyone with information or dashcam footage from the vicinity of Michael Avenue are urged to contact Campsie police or Crime Stoppers on 1800 333 000.
House fire investigated
INVESTIGATIONS are continuing into the cause of a house fire in Belfield early this morning.
