A police spokesman said they were called to a Mull St address at about 12.15am on Saturday.
"Enquiries are under way to determine the circumstances that lead to the death, which is being treated as unexplained at this time," the spokesman said.
Several police wearing protective clothing could still be seen at the address by early Sunday afternoon.
A neighbour, who was not home at the time of the incident, said the house often held loud parties.
- Do you know more? Email reporters@odt.co.nz