The Wellington City Council has formally endorsed Wairarapa's bid to create a single unitary authority.
At a strategy and policy committee meeting on Wednesday councillors voted in favour of a super-city comprising Kapiti, Porirua, Wellington, Upper Hutt and Lower Hutt, and "strongly supported" Wairarapa deciding its own governance, according to Masterton councillor Lyn Patterson.
The Kapiti District Council also voted on Wednesday to support Wairarapa in its bid.
Ms Patterson, who is also chairwoman of the Wairarapa Governance Working Party, attended the Wellington meeting that debated for nearly four hours. She said Wellington was clearly opting for a "metro" city.
"What I was really pleased about, it's showing the whole capital city is taking a leadership role in this debate. What came through for me quite strongly, was the willingness.