The by-election in Gooshays Ward, Harold Hill, was won by Lawrence Webb, of UKIP, who will now join Councillors Pat Murray and Keith Wells in representing the ward.
Councillor Webb won with 39 per cent of the vote. Labour's Christine McGeary followed with 27 per cent of the vote and the Conservative Party candidate Marcus Llewellyn-Rothschild won 13 per cent of the vote.
Turnout of the by-election was 20.62 per cent.