The tragic death of two young Turners Marsh sisters could have been avoided if smoke alarms were installed in the shed where they were sleeping.
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Ruby and Shanzel Brewer's bodies were found after the shed - which was converted into a granny flat - burned down at their home in June 2017.
They were 13 and 10.
Releasing his findings on Wednesday, Coroner Simon Cooper described their deaths as "an indescribable, but avoidable tragedy".
"Their deaths may well have been avoided if cheap and easily available smoke detectors had been installed in the shed in which they were sleeping," he wrote.
"Further, it is quite clear that the electrical work at the property was dangerous."
The girls lived at the property with their father, his partner, and other siblings, and had been sleeping in the shed for about 12 months before the tragedy.
The property was not owned by Mr Brewer, and the coronial investigation found he and his partner had experienced ongoing issues with their power supply, and at some point he had attempted his own electrical work at the property.
"Mr Brewer was not qualified to carry out that work," Mr Cooper wrote.
"He was not trained to do that work, although he told police that he 'done a course years and years ago...family courses and stuff'."
But Mr Cooper said the property owner was ultimately responsible for the standard of electrical work.
The investigation also found a person hired by the property owner to power the shed by connecting it to the house held a restricted electrical license, which only authorised him to perform electrical work on refrigerators and air-conditioning units.
"The other source of power to the shed was by two standard extension cords, joined together, which ran from the lounge room of the main house, out a window and over the drive way to the shed," Mr Cooper added.
"The extension cord entered the shed through a slot that had been cut in an aluminium window. It was plugged into an upright fan heater."
One month before the girls were killed, a qualified electrician was sent to the property.
That electrician later told investigators the electrical circuit at the property was overloaded.
While Mr Cooper could not be "sufficiently satisfied" that the electrical work carried out by an unlicenced electrician or Mr Brewer contributed to the fire, he said "that no one should ever carry out electrical work of any kind unless they are properly qualified and licenced to do so".
He also recommended that "every home occupier install and maintain properly operating smoke detectors, especially in rooms where people are sleeping".
"Coroners, fire authorities and safety experts have repeatedly warned about the need for properly operating smoke detectors to be installed in homes," he wrote.
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