Council leader and Conservative councillor Robert Gordon CBE (Goffs Oak and Bury Green) died in October 2017.
[26] Liberal Democrat councillor Charlotte Hogg (St Albans North) resigned from the council in March 2018.
[27] A by-election was held on 3 May, where Roma Mills from the Labour Party captured the seat from the Liberal Democrats.
The Lib Dems won with an increased majority with Labour opting not to nominate a candidate.
Labour won with an increased majority with the Lib Dems opting not to nominate a candidate.