Range from the cheapest replacement of a toilet float valve £40 (Nicholas Wycisk based in CR0) to the dearest replacement of a float valve £95 (Imq based in CR2).
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 Sanderstead by posting a job with HaMuch and we will send it to plumbers in Sanderstead.