Labour leader Andrew Little says there is no rational explanation for the Government's allowing an Australian housing provider to buy up to 500 state houses as part of housing reforms.
"We have been paying taxes for Housing New Zealand and its predecessors to do this for the past 80 years," Mr Little said.
"I am interested to know what has changed to make Housing New Zealand incapable of doing this and why it is we need an Australian provider to do this. That has never been explained."
Housing Corporation and Finance Minister Bill English told TV3 on Saturday that Queensland charity Horizon Housing, which provides affordable houses for sale and social houses for rent, could be in the market to buy up some of the state houses to be sold next year.
Housing New Zealand's stock is about 68,000 and Prime Minister John Key pledged that by the end of 2017 it would be at least 60,000, meaning 8000 could be sold.