Arson squad are investigating the blaze.
Authorities said fire ripped through a home in Commercial Road in Forrestdale around 3am on Saturday.
Sixteen firefighters attended the scene to extinguish the blaze.
One man was found deceased at the scene, it's believed he was inside the structure during the time of the blaze.
Arson squad will investigate the cause of the fire today.
Green thumbs, families invited to Pinjarra Garden Day
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NBL1 West: Devondrick Walker announced as new coach of Mandurah Magic men
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Two drivers killed in horror Peel region crash
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Arson Squad detectives continue investigation into Port Kennedy house fire
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Peel Thunder premiership coach Adam Read to depart club for GWS
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Man wanted for questioning over Wellard scooter theft
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New murals to transform Coodanup, Madora Bay public spaces during Mandurah Arts Festival
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Teen driver allegedly three times over legal alcohol limit in Rockingham
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New councillors elected in Rockingham, Mandurah
The results are in for the Local Government Extraordinary Elections in the City's of Mandurah and Rockingham.