Range from the cheapest price to Unblock a sink £50 (P Flynn based in W7) to the dearest cost to Unblock a sink £130 (Apostol Apostolov based in W13).
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 W13 by posting a job with HaMuch and we will send it to plumbers in W13.

"Unblock a kitchen sink.."
W7
"Unblock a sink - bathroom "
TW8