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.
Man dies following two-car crash near Cornwall Airport Newquay
English Para Surfing Open attracts competitors from across the UK and Europe to Fistral
One person taken to hospital after crash closes Newquay road
Newquay misses out on UK Town of Culture 2028 shortlist
Boardmasters outlines welfare and safeguarding measures ahead of festival
English Para Surfing Open to return to Newquay this weekend
Newquay mayor backs launch of Beryl e-scooters in town
Cornwall's worst mining disaster to be commemorated
Newquay BID launches campaign to encourage visitors during Boardmasters week
Poundstretcher in talks over opening Newquay store
Van resident calls for better understanding of van dwellers
Action being taken after car park dwellers cover their number plates
Former Walkabout in Newquay to reopen as Rattler Beach House
Aldi have launched a public consultation on plans to relocate the existing Cliff Road store
Tensions over ‘Glendorgal-gate’ are growing in Newquay
Newquay carnival and mile race return to town this weekend
Newquay Lions appoints new president at annual handover
Growing opposition to plans to end coastguard rescue team payments
Family's emotional plea to missing Holly three months on