Range from the cheapest replacement of a toilet float valve £25 (Ljp.homeimprovements@yahoo.co.uk based in EN6) to the dearest replacement of a float valve £95 (Potters Bar Plumber based in EN6).
Comparing plumbers estimates for replacing a toilet float valve in the cistern tank 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 toilet float valve in EN6 by posting a job with HaMuch and we will send it to plumbers in EN6.