Range from the cheapest Downlights installation £357 (Mayday Electrical Solutions Ltd based in NW1) to the dearest Downlights installation £440 (GRDS Electrical Solutions based in N7).
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 Havering.