Range from the cheapest window sill replacement £240 (DAVID HORTON T/A based in CH65) to the dearest window sill replacement £500 (TB Electrics based in CW8).
Comparing carpenter & joiners estimates for replacing a window sill 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 to replace a window sill in CH3 by posting a job with HaMuch and we will send it to carpenter & joiners in CH3.