Upgrades to Otago Corrections Facility after Maddren escaped in June have cost $69,981.64, information released to the Otago Daily Times under the Official Information Act (OIA) shows.
Police and helicopter costs have been estimated at nearly $10,000.
However, the full cost and details of his escape remain clouded because the Department of Corrections refused many of the ODT's requests for information.
Maddren is the first person to escape from the prison at Milburn since it opened in 2007.
Information from the OIA request shows that ''whilst waiting to access a unit within the prison grounds, he ran from staff, climbed on to the roof of a building, lowered himself outside of the prison grounds and ran from the site''.
It is understood that he scaled a drainpipe in an internal yard and climbed down another pipe attached to the outer wall.
Corrections would not explain how the upgrades money was spent because it ''could compromise the security of the prison''.
Additional costs to Corrections from the escape were not revealed by the department. The full cost of his escape would not be released because the department would have had to ''initiate a project to extract, analyse and present the information''.
''Therefore, this part of your request is declined,'' a response from Corrections read.
Police earlier gave the ODT an ''approximate'' and ''conservative'' cost of $8000 for police staff during the first 72 hours of the search.
Corrections confirmed ''approximately 35 staff'' were involved in the initial search for Maddren on June 3.
Police also used a helicopter on the first night of the search and that cost about $1500, Dunedin Clutha Waitaki area commander Inspector Jason Guthrie said.
Maddren spent seven days on the run before he was caught by police asleep in the hot water cupboard of a shearers' residence in Milton, 7km from the prison.
On the day of his escape, Maddren arrived at the prison about 3.30pm after appearing in the Dunedin District Court and was processed in the receiving office, a Corrections spokeswoman confirmed.
''He left the receiving office at approximately 4.17pm, to be escorted to his unit, and escaped soon after.
''Escape emergency procedures were put into place and police were notified at 4.20pm,'' she said.
An operational review into the escape found Corrections staff had ''followed all correct procedures and practices during the escort from the Dunedin District Court''.
''Staff adhered to all relevant operational standards, procedure and systems during and following the escape,'' a summary of the review prepared for the ODT said.
The review identified the need for some improvement to the ''physical security of the site''. However, Corrections would not release a copy of the review's findings because they contained ''security information'' and ''tactics'' and could ''hinder the flow of information for future operational reviews''.
Stephen Maddren's escape
What we know
• Upgrades to Otago Corrections Facility after Maddren's escape cost $69,981.64.
• Police staffing cost about $8000 during first 72 hours of escape.
• Use of helicopter during first night of search cost about $1500.
• Maddren arrived at prison, after appearing at the Dunedin District Court, about 3.30pm.
• Escaped soon after 4.17pm, after being processed in receiving unit.
• Maddren not in restraints at time of escape.
• Maddren with one Corrections staff at time, but had been accompanied to prison by two staff members.
• About 35 Corrections staff involved in initial search.
What we don't know
• Details of Maddren's escape, requests for information withheld by Corrections.
• Full cost of Maddren's escape withheld because Corrections would have to ''initiate a project to extract, analyse and present the information''.
• Operational review contents withheld because its release could ''hinder the flow of information for future operational reviews'' and compromise security.
• Maddren's risk assessment by Corrections withheld.
• Copies of emails between Corrections and Corrections Minister Anne Tolley refused as none could be found.
