Changing Sydney housing reform to add 112,000 new homes

Planning reforms will permit more dual occupancies across NSW to help address the housing crisis. (Dan Himbrechts/AAP PHOTOS)

Australia's most expensive housing market should become a little more affordable under what's been dubbed the biggest mass rezoning of Sydney in decades.

While not changing any one area's zone, the proposed NSW-wide baseline would green-light more density with the aim of building 112,000 homes in six years.