"The scale of this growth is unprecedented and equates to Auckland growing by the equivalent of Whangarei every three years," he said.
But the Labour Party said there was no cause for celebration.
"The projections in the so-called construction pipeline are not worth the paper they are written on," housing spokesman Phil Twyford said.
"They are based on demand projections, not the industry's ability to meet that demand, and don't take into account the many impediments to the industry scaling up."
He said more houses were being built than during the financial crisis, but not enough to keep up with demand.
The new forecasts showed a move towards the construction of multi-unit dwellings.
In the past year, the construction of standalone houses increased slightly, while the construction of apartments, townhouses, flats and units increased significantly. By 2020, half of the consents in Auckland are expected to be for multi-unit dwellings - up from 44 per cent. The report also showed a sharp increase in retirement village units, which now made up 6 per cent of new homes, twice the historic norm.
Building activity is expected to rise in Waikato and the Bay of Plenty.