How Much Does It Cost to Unblock a Drain?

A blocked drain typically costs somewhere between £50 and £200 to clear, with an average of around £100, according to MyJobQuote’s drain clearance cost guide. Most plumbers charge around £40 an hour for this kind of job, and a straightforward clearance usually takes 1 to 2 hours. Where you land in that range depends mostly on how far into the system the blockage sits, and whether it is a one-off clog or something that keeps coming back.

What affects the price

• Location of the blockage. A blocked sink, bath or toilet is the cheapest fix, typically £50 to £70, because a plumber can usually clear it at the fixture itself. A blockage further down the system, in an underground run or a shared drain, takes longer and costs more.
• Method used. Manual rodding or a plunger is the cheapest approach for a straightforward clog. Persistent or stubborn blockages sometimes need high pressure water jetting, which costs more but clears grease, roots and scale that rodding alone will not shift.
• Access. A drain with an accessible manhole cover is quicker and cheaper to work on than one buried under a patio or hidden by later building work.
• Whether it is a one-off or repeat problem. A blockage that has come back more than once is a sign of a deeper issue, and diagnosing that properly costs more than clearing a single clog.

When you need a CCTV survey instead

If the same spot keeps blocking, or a plumber cannot clear it with rods alone, a CCTV drain survey is the next sensible step. A small camera is fed through the pipe and shows exactly what is going on, whether that is a build up of fat and scale, tree roots that have found their way in through a joint, or a genuinely collapsed or cracked section of pipe. This typically costs around £120 for a property with a single manhole, and it is money well spent before agreeing to any excavation work, since it tells you precisely what you are paying to fix rather than guessing.

Try this first, before you call anyone

For a single slow or blocked fixture:

1. Try a plunger first, making sure there is enough water in the bowl or sink to create a seal.
2. Use manual drain rods on an external gully or manhole if you can safely access it, working the blockage rather than forcing it, which can damage older pipework.
3. Avoid chemical drain cleaners as a first resort. They can work on light grease clogs, but repeated use damages older pipes, and they make it harder and less pleasant for a plumber to clear the blockage manually if the chemical treatment does not work.

If none of that shifts it, or the blockage affects more than one fixture at the same time (a sign the problem is further down the shared system, not at the fixture itself), it is time to call a plumber. This comes up a lot in older housing stock, terraces in Loughborough with original clay pipework are a good example, where roots and decades of scale build-up mean a plunger was never going to be enough.

Whose responsibility is it?

In the UK, you are responsible for the drains within your own property boundary. Once a drain crosses into a shared or public sewer, it typically becomes the responsibility of your local water company, and you should report a blockage there rather than paying a private plumber to dig up a public sewer. If you are not sure where the boundary sits, a plumber attending the job can usually tell you, or you can check with your local water company directly.

Finding a plumber before it becomes urgent

A recurring blockage is rarely solved by clearing it again and again. Look for a plumber who is willing to explain what they think is actually causing it, not just clear it and move on, and check they are a member of a recognised body such as WaterSafe. We check exactly this when we build our Top 5 lists, so a page for towns such as Milton Keynes is a fast way to find a plumber who has already been vetted.

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