There's opposition to making Christchurch a super city.

Moves to overhaul New Zealand’s local body system has prompted a submission from the City Council calling for a new structure for the city.

City councillors unanimously agreed to the submission, although two disagreed with the bid to become a super city, known in legislation as a unitary authority.

Selwyn mayor Sam Broughton says it sounds like imposing the Auckland model on Canterbury.

"I don't know that super city in Auckland's done local particularly well, and I would hate to lose the local play that we've got in greater Christchurch by thinking about moving to a super city."

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