Range from the cheapest price to Unblock a sink £50 (Swarajpal Singh based in TW2) to the dearest cost to Unblock a sink £170 (ThePlumbers.org based in TW7).
Comparing plumbers estimates for unblocking a sink 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 unblock a sink in TW1 by posting a job with HaMuch and we will send it to plumbers in TW1.