Range from the cheapest Downlights installation £310 (Howard Sobey Electrical based in KT16) to the dearest Downlights installation £440 (JMC Electrical Ltd based in TW17).
Comparing electricians estimates for Downlights installation 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 for installing downlights by posting a job to electricians in Addlestone.