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.
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Man found dead inside Orelia home, one in custody
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Nominations now open for Mandurah's 2027 Community Citizen of the Year Awards
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Cooloongup man sentenced for poisoning dog before dumping body in rubbish bin
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Bird flu vaccinations begin on little penguins at Penguin Island
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Man fined $10k over shocking cruelty towards German Shepherd in Baldivis
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