New Zealand is up to 60,000 houses short, with Auckland needing as many as 35,000 homes, estimates in a Treasury document suggest.
The figures are part of housing supply and demand forecast produced in September of 2016 and released in January as part of an Official Information Act request.
Using their own metrics, Treasury estimate that the "cumulative shortfall" houses in Auckland was at between 30,000 and 35,000 in June of 2016.
That figure is estimated to get slightly worse in 2018, as the population continues to increase, before improving.
It indicates that between June 2015 and June 2016, just under 9000 homes were added to the market in Auckland - but 16,748 buyers started looking for homes.
Treasury projected this shortfall to slowly drop to around 15,000 by 2030, but noted that slight changes in population growth, the economy, or household size could change that.
If population growth follows a "high projection" produced by Statistics NZ, the shortfall could grow by 30,000 homes by 2030.
NATIONAL SHORTFALL OF 60,000
ANZ Bank estimates that the shortfall is growing by 4000 homes per quarter, for a national shortfall of 60,000 dwellings.
Labour, who requested the information, has seized on the ANZ figure.
"Every day we wait, the housing shortage grows by over 40 houses. The results are all around us – out of control prices, speculators, skyrocketing rents. It means families missing out on the Kiwi dream of owning your own place.
"It means overcrowded, over-priced rentals. It means families ending up homeless," Labour leader Andrew Little said.
"The solution is simple: build more houses. Labour will build 100,000 affordable homes for first homebuyers. We can fix this."
Labour released the figures to Mediaworks' new The AM Show, who pushed Prime Minister Bill English on the subject.
He said it was "rough estimate produced by ANZ some time ago", and dismissed the figure.
"Across the country we've got the largest construction pipeline we've ever had…and it's going to keep growing," he told The AM Show.
"You can't manufacture tens of thousands of houses out of fresh air."
The AM Show host Duncan Garner also pressed Little on the subject, asking whether his 10,000 homes a year target was realistic.
Little conceded that around 20,000 homes in their first three-year-term was a more realistic projection, but said building would then go "gangbusters".
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