cost to install dimmer switch
To swap a ânormalâ light switch for a dimmer switch, which you are supplyingâ¦.Â£40.00. Add Â£5.00 to the above Price to install double dimmer switch and an extra Â£10 to install a triple dimmer switch. Electrics, (processes, legalities, testing etc) are horribly complicated. We have a very detailed article elsewhere on the site which you can read by going to Electrics.