Ngawha Prison inmates building a house say the fact their creation will go to a family in need makes the process more satisfying.
Ten inmates at Ngawha's Northland Region Corrections Facility have been working on the latest house for Habitat for Humanity, which on completion would be craned over prison walls and trucked to its new site at Tikipunga.
Project leader and Ngawha inmate Ross - whose name has been changed - said he had been a competent builder for about nine years, but had never received a formal qualification, until he was sent to prison.
"This is a good opportunity just to finish off the paperwork," he said.
Habitat for Humanity's Assisted Home Ownership scheme formerly saw families contribute 500 hours building their home alongside prisoner work parties from Corrections outside the wire. However, a rule revision after a high-profile prisoner escape in 2014 meant the houses now had to be built inside the prison.