Reading Borough Council wants two extra councillors despite Conservative members attacking the increased cost.
The Local Government Boundary Commission for England (LGBCE) is undertaking an electoral review of the council this year, based on its analysis of the 2017 annual canvass in the town.
The authority agreed to write to the LGBCE to say it wants to increase the number of councillors from 46 to 48. The council also wants three members in each of its 16 wards.
Labour councillor Jason Brock, leader of of the council said: “We all feel that it is important in the Labour administration that we seek to retain as far as possible the ratio between councillors and electors."
Conservative councillor Emma Warman called for the council to request a reduction of councillors to 45.