The election saw Labour remain in control of Lambeth Council with a majority reduced by two seats. The party were wiped out in the St Leonard's ward, and they also lost a councillor in both Gipsy Hill and Herne Hill wards. For the first time since the creation of the council, the Greens became the official opposition with five councillors, including
Jonathan Bartley, who is the co-leader of the Green Party. The Conservatives were reduced down to a single seat in Clapham Common, after Labour gained two of the seats they had previously held, despite the Conservative vote share in the ward increasing. The Conservatives failed to gain their target wards of Thurlow Park, Clapham Town and Larkhall. The Liberal Democrats failed to make any gains at the election. However, they did comes second to Labour in their target wards. Rachel Heywood, a former Labour councillor in Coldharbour sought re-election as an independent candidate. Heywood failed to win the seat and finished in 6th place, behind both Green Party candidates but ahead of the Conservatives and Liberal Democrats. The Women's Equality Party received 8% of the vote in the Brixton Hill ward, finishing in 5th place, ahead of two of the Green Party candidates, the Conservatives and Liberal Democrats. The party also stood candidates in the wards of Prince's and Ferndale. UKIP saw their vote share largely decrease in the wards they stood in. The Federalist Party polled 0.2% of the vote in the Prince's ward with the Pirate Party polling 0.2% in the ward of Vassall. Council composition following the election in May 2018:
Proportionality The disproportionality of the 2018 election was 31.00 using the
Gallagher Index. ==Results by ward ==