Police say they are "investigating the circumstances" surrounding the fire in a derelict Narrowcliff property after a body was found inside.
Officers were called by the fire service at around 4.35pm on Tuesday 22 July.
A spokesperson for Devon and Cornwall Police said: "Following enquiries to identify and locate next of kin, we can now confirm that the body of a man in his 30s was found deceased in the property.
"His next of kin have been informed.
"The death is currently being treated as unexplained, but officers are keeping an open mind".
Enquiries are ongoing and a police cordon remains in place at the scene.
Witnesses or those with relevant dashcam footage are urged to call 101, quoting 50250189321.
Joe Way Paddle for Life to return to Newquay this summer
Yellow weather warning issued as Storm Ingrid approaches Cornwall
Police appeal to trace wanted man from Newquay
Overturned car closes Newquay road
Attraction partners with Cornwall Air Ambulance to support fundraising
ANPR cameras removed as Towan Headland car park returns to council control
Urgent search for Newquay breast screening site as service faces uncertainty
St Francis Dogs Home unveils major new upgrade
Plans submitted for Hotel Victoria in Newquay
Police appeal for witnesses after serious A30 crash
Business leaders warn over proposed winter parking charges in Newquay
Consultation launched on winter parking charges at Newquay car parks
Police are appealing for help to identify two men following an aggravated burglary in Newquay
Burger King in Newquay closes its doors for the final time
Police clampdown on speeding motorists outside Newquay school
Business group boss looks ahead to 2026
Police and Crime Commissioner becomes independent
New Year Dip raises nearly £5000
Police are appealing for witnesses after a serious road traffic collision in Newquay
The future of Newquay Zoo is secured after new owner is revealed