Firefighters were called to a house fire in Hillwood Street, Clyde at 12.34pm on Monday, 10 August.
Five CFA units from Clyde, Berwick and Cranbourne responded, supported by FRV.
Rostered Duty Officer District 8, Arthur Haynes, said the single-storey house was fully alight when firefighters arrived.
"The fire started in a double garage and progressed to the house," RDO Haynes said.
"The garage area was totally destroyed but crews did a great job to minimise the damage caused to the house."
Six occupants had safely self-evacuated.
The incident was under control at 1.22pm and a stop was issued at 2.47pm
Fire investigators attended and deemed the cause to be accidental.
The incident is a timely reminder for all Victorians to regularly service and maintain their electrical appliances, including heaters, and ensure working smoke detectors are installed.