The body found in a burnt-out building in South Westland last Friday is believed to be the property's owner.
"At this time police believe the deceased is likely to be the resident of the property, Maxie William Furgson Duncan, aged 77," Tasman district police communications manager Barbara Dunn said.
Forensic testing would confirm the identity, and a post-mortem examination would determine the cause of death.
It would be some time before a positive identification could be made, she said.
The 20m x 30m building was reported to the Fox Glacier Volunteer Fire Brigade as being ablaze at 3am Thursday.