The Government will spend $377 million to add more bedrooms to existing state houses and to build extra houses.
Housing Minister Nick Smith said "Project 324&5" was designed to convert three-bedroom houses into four- and five-bedroom homes.
"Project 324&5 recognises that Housing New Zealand, and particularly Auckland, have an oversupply of three bedroom homes and a real shortage of larger ones," Dr Smith said.
"The initiative is expected to deliver up to 3000 new state house bedrooms to 2000 properties over the next two years, with three quarters of them in Auckland.
"Adding an extra one or two bedrooms to these properties will better meet tenants' needs in relation to size, location and amenity. It will also result in less overcrowding and better health and education outcomes."