Range from the cheapest Downlights installation £250 (Mohammad Reza Mohammadi based in EN5) to the dearest Downlights installation £540 (JIF Electrical based in WD6).
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 Borehamwood.