Range from the cheapest price to Unblock a sink £106 (W4Plumber.com based in W4) to the dearest cost to Unblock a sink £170 (FD Plumbing & Heating based in W4).
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 W4 5p by posting a job with HaMuch and we will send it to plumbers in W4 5p.

"Unblock a sink - bathroom "
TW8
"Unblock a bathroom sink"
W3