The borough will face its fifth by-election in less than a year after a Lib Dem councillor announced his resignation.
Kingston councillor Marc Woodall, who received over 2,000 votes at May 2010 elections, stepped down on Friday, May 25, to take up a politically restricted post at Surrey County Council.
Mr Woodall has been promoted to a position where he must advise on politically sensitive issues, which means he can no longer be a councillor under strict civil service rules.