The Labour Party is accusing the Government of planning to build new homes on Crown land that is unsuitable, including an area with a sub-station.
It says only a quarter of the 500 hectares of land the Government wants to use is suitable for building on.
Labour's Housing spokesperson Phil Twyford questioned the Housing Minister Nick Smith over his building plans in Parliament this afternoon.
"Can he confirm that no parcel of land in his 500 hectares has any of the following on it: power substations, pylons, a cemetery, a fire station and school playing fields.
"And if he can't confirm that, is his refusal to release the full list of sites down to his embarrassment or his incompetence?"
Mr Smith responded to that question, saying the site Mr Twyford referred to has a sub-station in one corner and there were three hectares of vacant land available.