It depends on where the blockage is and how bad it's got — there's no single flat price that's honest to quote without knowing that first, which is exactly why a proper look (or a clear description over the phone) comes before any figure.
What actually changes the price
Location and access matter most. A blockage in an internal fitting — a sink, bath or toilet trap — is usually a smaller job than one further down the shared drainage system, which can mean working through a manhole or, in the worst cases, excavation to reach the pipe. Severity matters too: a partial blockage cleared early is a smaller job than a full backup that's been left to get worse.
Why "how much to unblock a drain" searches rarely get an honest flat answer
Any site quoting one fixed price for "drain unblocking" regardless of what's actually wrong is guessing, not quoting. The honest version is: describe what's happening, and you'll get a straight answer on what it likely involves — not a lowball figure that changes once someone's on site.
Emergency vs. booked-in
An urgent, same-day response for an active overflow typically costs more than a booked-in appointment for a slow-draining sink that can wait a day or two. If you're not sure which category yours falls into, our guide on whether a blocked drain is an emergency covers exactly that distinction — worth a read before you call, so you can ask for the right kind of visit.
Getting an honest number
Call 07468 868807 and describe what's going on — where it is, how long it's been happening, and whether other drains are affected. That's enough for a straight answer on what it's likely to involve, before anyone sets foot on site.