Auckland Mayor Len Brown says the economic downturn has more to do with the slump in house building than council controls on urban sprawl.
Replying to calls to free more farmland for affordable homes, Mr Brown says Auckland has enough land ready to build 18,500 homes.
"Auckland needs approximately 10,000 dwellings to be built a year to keep up with population growth," he says in a letter prepared for Friday's Auckland Council meeting with Government ministers.
"There is currently provisions for the development of approximately 18,500 dwellings on already zoned and serviced greenfield land.
"This land can be built on today subject to market conditions and represents four years' worth of supply of greenfield land related to growth projections.