The spin-off of Auckland's housing affordability crisis was that Aucklanders who could not buy in their city were buying in Tauranga and Hamilton.
Mr Twyford said there needed to be change for renters, which Labour would achieve in two ways.
Firstly, the party would introduce minimum standards or "warrants of fitness" to ensure all rental properties were insulated and equipped with a modern fixed heating source before they could be rented out.
Secondly, a reform was needed of the Residential Tenancies Act to encourage longer-term tenancies, which Labour would discuss with relevant parties once it was in Parliament. Emergency housing would also be addressed.
He praised the work support agencies were doing in this regard, but said there needed to be more and "central government needs to step up".
Mr Twyford wanted to see more state houses built to address a shortage. "The answer is to build more houses, not sell off the ones we've got."