The Council for Infrastructure Development says the Auckland super-city transition agency should ensure it's business as usual for ratepayers and councils.
Five people have been appointed to the agency charged with merging the eight councils into one covering all Auckland.
The council says the agency must set up a process where councils won't hold back on spending money and renewing contracts.
Chief executive Stephen Selwood says life must go on while the merger is underway.
Meanwhile, the Public Service Association expects the super city will result in a "massive" loss of skilled and experienced staff.
National secretary Richard Wagstaff says the agency is effectively responsible for deciding what happens to 6800 local government employees.
It wants the workforce to be retained during the transition to the new council.