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.
Pop-up ice skating rink glides back into Mandurah for winter school holidays
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Federal opposition leader Angus Taylor sits down with local business owners in Mandurah
Federal opposition leader Angus Taylor visited Mandurah this week.
Police search for missing man last seen leaving Rockingham Hospital
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West Aussies urged to be on high alert after surge in winter house fires
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New $3.4 million boardwalk to be constructed at Lake Clifton thrombolites
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Driver dies in hospital after Australind crash
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Charges laid over fatal West Coolup crash
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