"Most poor people live in private rentals. Only 4 per cent of Kiwis live in state houses," said Labour's housing spokesman, Phil Twyford.
The Government completed an insulation upgrade of its state housing stock last year.
Mr Twyford has drafted a bill that would set minimum standards for insulation and heating for all rental properties, which would have to be implemented by landlords within five years. The private member's bill is due to come before Parliament soon but is expected to fail because of opposition from National, Act and United Future.
Dr Smith said it was important the Government got its own housing stock in order before it decided whether to apply warrants to the private and social housing sector. It was necessary to be cautious about removing houses from the rental market during a housing shortage.
Housing WoF
Insulation
Ceiling and floor insulation, good ventilation in all rooms, dry under-floor spaces and no leaks or mould.
Safety
Hot-water temperature controls, warning stickers on windows, well-lit access, smoke alarms, secure storage for toxic substances, handrails, smoke alarms.
Amenities
Working toilets, showers, basins, doors, kitchen sink, washing machine, kitchen storage, utensils and food preparation area, wastewater and stormwater services, property identification, and an electric light in each room.