Range from the cheapest installing or fixing of light switches £56 (P B Electrics based in BR1) to the dearest installing or fixing of lightswitches £96 (Alpha Services based in SE12).
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 SE12 by posting a job with HaMuch and we will send it to electricians in SE12.

"When the switch of hall light turn on, the main switch jump off,after I take off the 4 bulbs which control by this switch, still same. "
SE12
"Install or fix a light switch"
BR1