Auckland's housing boom has forced its council to enlist the help of other local authorities to process building consent applications.
Auckland Council received a record 23,220 applications last year, up by 12 percent, and consents teams at Wellington and Porirua city councils have been contracted to help process them.
"Demand for consents has been relentless," said the council's building control processing manager Doug Naylor.
It has contracted the two southern councils for an initial year-long term to ensure there are no unnecessary delays with applications.
"The boom has made it difficult to find experienced design and construction specialists the council - and the wider industry - require to meet demand," he said.
It is also looking at other possible providers.