The driveway entrance to the Wyndham St property has been cordoned off with emergency services tape and a female police officer was guarding the two-storey home. There was also one other undercover police vehicle parked outside.
Police could not make any comment at the scene.
Manawatu Fire Service area commander Mitchell Brown said an investigation of the fire-damaged home had found no smoke alarms installed in the property.
"Smoke alarms are your only voice in a house fire. You're on a hiding to nothing if you're in a house fire and you don't have any smoke alarms," said Brown.
Mr Mitchell said the dead man was sleeping on the upper storey of the house which had become smoke-logged.
He made a fresh appeal for people to install working smoke alarms throughout homes to avoid a repeat of today's tragedy. It was important to position them near sleeping areas and on both levels of two-storey homes.
Early investigations revealed the fire had started on the ground floor. Photo / Alecia Rousseau of the Manuwatu Guardian
Early investigations revealed the fire had started on the ground floor in the stairwell adjacent to a woodburner. It had travelled up the stairs to the second storey destroying a key internal escape route.
A Fire Service spokeswoman said firefighters were called to a property in Wyndham St after reports of smoke in the area.