Firefighters expect to remain on scene for several hours damping down and checking for hot spots.
The cause will be investigated.
The initial damage estimate is $600,000.
The occupants have also asked nearby residents to keep a look out for a their cat who also safely evacuated from the fire but has not been seen since.
Firefighters have now contained the fire while the roof of the property has partially collapsed.
Bronto aerial firefighting platform now also deployed by the Brigade.
The home has been completely destroyed.
There was three occupants inside the property when the fire started who all safely evacuated.
The fire has spread into the roof space of the large house.
Firefighters are battling to control the blaze which is producing thick smoke.
Occupants of the home safely evacuated.
The house is fully engulfed in fire.
Four fire pumpers on the scene so far along with BA van and DO.
Brigade alerted to fire by multiple emergency triple zero calls.
The ACT Fire Brigade is responding to reports of a house fire in MacRobertson Street Mawson.
Update to follow.