Auckland Council will ask Parliament to change the Super City's founding legislation that fixed the number of councillors, saying population growth could affect the quality of citizens' representation.
The council is the only one in the country without power to review how many councillors sit on its governing body, because the Local Government (Auckland Council) Act set this at 20, plus the mayor.
The first elected members to the merged council began work in November 2010 after Parliament's initial legislation decided their number and introduced the concept of shared decision-making between the governing body and 21 local boards.
The Local Government Commission decided the number of councillors' wards, with the boundaries of wards coinciding with those of one or more local boards.
The current number of 20 members is "workable", according to a report from a working party of elected members and two from the Independent Maori Statutory Board, which was provided for in the final legislation.