Range from the cheapest Downlights installation £240 (Sam Autos based in N19) to the dearest Downlights installation £540 (Cousins Contractors Ltd based in EC1V).
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 Holloway.