Polling stations opened at 7am and will close at 10pm, with those queuing when the venues close still able to vote.
Our local authorities manage everything from bins and libraries to how much businesses have to pay in rates and whether street lights are switched off at night - so if you want to have a say you need to vote.
Controversial plans forcing voters to prove their identity before casting their ballot will be trialled at some polling stations.
Seats on 25 councils up for grabs.
The voters will pass judgment on Prime Minister Theresa May's party today in local government elections expected to show rising support for her opponents in London that will add to pressure on her position over Brexit.
Elections are being held in more than 150 councils, while mayoral elections will take place in Watford, Hackney, Newham, Lewisham and Tower Hamlets.
However recent events, such as the poisoning of former spy Sergei Skripal, have seen a late resurgence in her popularity, while Labour leader Jeremy Corbyn has been hammered over his weak responses to the Salisbury attack, the chemical attack in Syrian town Douma and control of anti-Semitism within his party.
But a survey last week for Queen Mary University gave Corbyn's party an overwhelming 51%-29% lead over the Tories in London.
In Stevenage, there are 27 Labour councillors, nine Tories and three Lib Dems.
An unknown factor in Wandsworth will be the impact of new anti-Brexit party Renew, which is wooing Europhile voters with nine candidates in a borough which voted 75% Remain in the European Union referendum.
UKIP massacred the results last time, in 2014.
But councils to watch for possible Conservative gains include Portsmouth, Basildon, Thurrock, Peterborough and Colchester, all of which could see the party win overall control on a relatively small swing.