Range from the cheapest Downlights installation £250 (IRewire based in LE14) to the dearest Downlights installation £410 (Letts Electrical Services Ltd based in LE7).
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 Corby.