In terms of the Eighth Amendment of the Constitution and the judgment of the Constitutional Court in United Democratic Movement v President of the Republic of South Africa and Others, in the period from 8–22 October 2002 councillors had the opportunity to cross the floor to a different political party without losing their seats.
In the Overstrand council, seven councillors departed the Democratic Alliance (DA) to become representatives of the New National Party (NNP).
At the election of 18 May 2011, the council was expanded to 25 members with the addition of 3 new wards and 3 new PR list seats.
The following by-elections were held to fill vacant ward seats in the period between the elections in May 2011 and August 2016.
The following by-elections were held to fill vacant ward seats in the period between the elections since August 2016.