UPDATE: An Osborne Park family have lost their home after a fire engulfed their Cape Street unit, causing an estimated $250,000 damage.
Fire and Emergency Services received a triple-zero call about the fire about 2.50pm today.
The fire was brought under control within 20 minutes.
Department of Fire and Emergency Services district officer for Stirling David Wilson said the blaze caused extensive damage to the unit.
Mr Wilson said it was estimated the fire had caused about $250,000 damage, which included the neighbouring properties that were severely damaged by smoke.
He said the cause of the blaze was undetermined but it would be investigated.
"A gentleman was cooking downstairs. We’ve got our fire investigation people to come have a look and also the police arson squad will be attending," Mr Wilson said.
"It appears the fire has started in the kitchen.
"The family is pretty shaken up, as you can imagine."
Mr Wilson said no one was injured in the fire.
Neighbour Jack Thompson said he was returning home when he smelt smoke.
"I was just coming back from the shops and we smelt the smoke and we thought it ours but when we went in we realised it wasn’t ours, it was the person’s across the road, just on the other complex side,” Mr Thompson said.
“It was just on fire. There wasn’t really flames, it was more just a lot of black smoke.”