Sally Macauley, representing the DHB, said she was grateful for the honour of cutting the ribbon her friend Petera Reid.
"This is something really special to me," she said. "Early today we were blessed to have a dawn service, and I would like to thank our kaumātua and kuia, along with the staff who brought life and energy into the building, honouring all those who have helped to build it and making it ready for those who wish to visit in the future.
"This beautiful new building fills a valuable purpose in our community. It replaces the one alongside that is no longer fit for purpose, and I understand is soon to be demolished.
"There will be transitional treatment and rehabilitation to minimise the need for hospitalisation; we say prevention rather than cure. We promote independence and quality of life for people with a mental health illness at a crucial point of recovery or relapse."
Northland DHB general manager mental health and addiction services, Ian McKenzie, said the new unit was an important symbol of the DHB's commitment to work in communities.