Range from the cheapest price to Unblock a sink £100 (Gas Man & Plumber based in E9) to the dearest cost to Unblock a sink £200 (Boiler Repairs London based in E9).
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 E8 by posting a job with HaMuch and we will send it to plumbers in E8.

"Unblock a sink that’s clogged and not unclogging despite plunger"
E8
"Two kitchen sinks, big one is fine, small one is stuck. There has been leakage under the sink before but now fine but small sink is still stuck. "
N1