"Labour's plan will free up the restrictive land use rules that stop the city growing up and out," he said.
"It will stop land prices skyrocketing, and put the kibosh on landbankers and speculators."
But Environmental Defence Society chief executive Gary Taylor has concerns with the plan.
"This is a very strange idea coming out of Labour. Not at all good for the environment," Taylor said.
Auckland councillor Chris Darby says politicians should stay out of the boundary issue.
Darby, one of four councillors assigned to the proposed Unitary Plan and deputy chairman of the council's development committee, said the comments were premature.
"It's only a few weeks until we get the report from the Independent Hearings Panel on the unitary plan. There are submissions to soften, abolish or strengthen the boundary," Darby said.
"We don't know what the panel will decide. But we as a city have gone through a long process and it's out of order for any politician - myself included - to try to influence that decision.
"Why did we establish the Independent Hearings Panel to work for almost three years on this, receive thousands of public submissions, hear expert evidence, all put before highly qualified commissioners?"
Twyford's boundary abolition suggestion also ignored the Future Urban Land Supply Strategy which the Auckland Council confirmed this year, Darby said.
However, Business NZ chief executive Kirk Hope welcomed the Labour Party's announcement, saying providing for more land is the key issue to freeing up the block on housing constraints.
"With agreement on this issue between both main political parties, it is to be hoped that local government planning decisions will take heed of the need to focus on land and housing supply," Hope said.
Labour MP Phil Goff, speaking in his capacity as an Auckland mayoral candidate, said he welcomed the opportunity to look at solutions outside the square.
"I welcome the statement that Phil [Twyford] has made and it will provoke debate around the question of the inadequacies of the current situation," Goff said.
"Whether the removal of the rural urban boundary will resolve the problem without having other consequences is something I am keeping an open mind on." additional reporting: Bernard Orsman, BusinessDesk