Range from the cheapest installing or fixing of light switches £40 (APEX DESIGN&CONSTRUCTION MANAGEMENT LTD based in E14) to the dearest installing or fixing of lightswitches £120 (New Cross Electrical based in SE14).
Comparing electricians estimates for installing or fixing light switches gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes to repair or replace light switches in SE10 by posting a job with HaMuch and we will send it to electricians in SE10.

"We have six overhead lights in our living room ceiling. They all work on/off from the same switch. We would like to add a dimmer to all of them. "
E14
"Replace pull cord light switch in bathroom."
SE8