Deniliquin Fire + Rescue NSW Captain Marty Smith said the origin was determined in preliminary forensic examinations on the home.
While the official cause has not yet been determined, Capt Smith said the likely cause was an electrical fault.
Firefighters were alerted to the blaze about 3.30pm on Thursday.
Capt Smith said it did not take long for the fire to take hold.
“When we arrived the home was well involved, with smoke and flames emanating from the front window,” he said.
Crews initiated firefighting techniques using breathing apparatus, entering the building to extinguish the flames.
“We also tackled any hot spots identified by the thermal imaging camera.”
Capt Smith confirmed the home’s occupants were at home when the blaze began, but that no one was injured.
“The occupants were in attendance but were able to leave the home,” he said.
“They heard noises and a member of the family then noted the flames in the roof (from outside the home), alerted other family members to get out and called Triple Zero.”
Capt Smith said firefighters were on scene for about two hours.
He said atmospheric testing was completed before firefighters left the property.
This process ensures there are no lingering threats of carbon monoxide poisoning.
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