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.
Mandurah to shine bright this Christmas
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Secret Harbour Beach closed due to shark sighting
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Rockingham named a hotspot for dog attacks on posties
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Desperate plea from family of critically ill toddler
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Motorcyclist dies in Oakford crash
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Fire destroys Waikiki granny flat
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Longer retail trading hours for Mandurah this Christmas
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Christmas on the Murray returns
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Local sports stars honoured at 2025 Mandurah Sports Awards
Local sports stars have been honoured at the 2025 City of Mandurah Sports Awards.