It is costing taxpayers almost $1 million a year to keep Ashley Peacock behind locked doors, according to information released under the Official Information Act.
The New Zealand Herald broke the story of Peacock's living situation last year, revealing the intellectually disabled, autistic and mentally ill man has lived in a 10sq m seclusion room in Capital and Coast District Health Board's Tawhirimatea Unit for five years.
Peacock, who is aged in his late 30s, is a compulsory patient under the Mental Health Act and spends up to 23 hours a day in an isolation wing. His sleeps in a room with just a mattress and a urine bottle.
Amnesty International, the Ombudsman and the Human Rights Commission have expressed concerns about his treatment, and his parents have long lobbied for him to be released.
In February, the board told parliament's health select committee it was spending about $750,000 a year to keep Peacock in the unit.