The unitary plan sets out to build 280,000 new homes through intensification of urban Auckland and 160,000 new homes in rural areas over the next 30 years.
New council research obtained by the Herald shows there is only capacity for 1250 new homes in urban Auckland this year and about 2500 homes over each of the next three years. The city needs another 13,000 new homes a year to cope with growth.
Declining home affordability have emerged as a major economic and political headache.
Dr Smith and Mr Brown have been at loggerheads over housing and the Unitary Plan, which the council wanted to have legal effect from September and the Government insisting it go through a three-year process to ensure Aucklanders were involved.
This week Dr Smith said the land supply issue required both short-term and long-term solutions.
In March he vowed to break the "stranglehold" of the council's policy of containing urban sprawl.
Solving the crisis
• Deal struck to free-up land.
• New sites to be released for development.
• Fast-track process for sites such as Hobsonville and Tamaki.