How Much Do Plumbers Charge to Unblock Drains? Plumber vs Drainage Firm

Most plumbers charge to unblock a drain the same way they charge for any other job: an hourly rate, usually with a minimum charge that covers the first hour or the visit. So the bill depends less on the plumber and more on where the blockage is and whether the plumber has the equipment to clear it quickly. A blocked sink trap is a short job on anyone's clock. A blockage in an underground drain can run up hours of hand rodding, or end with a second firm being called. This guide explains how plumbers price drain work, why the same blockage can cost more through a plumber, and when a plumber is genuinely the cheaper call. For what unblocking a drain costs in London whoever you book, see our guide to how much drain unblocking costs in London.

How much do plumbers charge to unblock drains?

A plumber will normally quote their standard hourly rate or minimum charge, plus any time beyond it. There is rarely a separate price for a drain, because to most plumbers a drain is labour like any other.

That makes the first figure you hear an incomplete one. An hourly rate tells you what one hour costs, not how many hours the job will take. Ask three things before you book: what the minimum charge covers, how time is billed after it (by the quarter hour, the half hour or the full hour), and whether evenings and weekends carry a higher rate. For comparison, our published drainage rate card sets a price by job type and time band before anyone attends, so you can put the two side by side rather than guessing how long a job will run.

Do plumbers unblock drains, or only sinks and toilets?

Most plumbers will clear blockages inside the house, such as a sink, bath, shower waste or toilet. Fewer take on the underground drain outside, the manholes or the pipe that runs to the sewer.

Inside the house a plumber has everything needed: they can take a trap apart, clear a waste pipe, plunge or auger a toilet and reseal it all afterwards. The picture changes once the problem is below ground. If more than one fitting is slow, if water is backing up in the lowest fitting in the house, or if an outside manhole is full, the blockage is in the drain rather than a waste pipe. Clearing that usually needs drain rods at minimum and often a jetter. Some plumbers carry both and are good at it. Many do not, and will tell you so once they have lifted the manhole cover, which is fair, but you still pay for the visit.

Why can a plumber cost more for a drain blockage?

Because hourly billing and the wrong equipment work against each other. A plumber clearing a drain by hand is paid for every extra hour it takes, and if the job fails you pay a second firm as well.

The extra cost usually comes from one of three places:

• Time on the clock. Hand rodding a compacted blockage of wet wipes, fat or silt can take a long time, and the meter keeps running whether or not the drain clears.
• A second visit. If the blockage will not shift by hand, you have paid for a visit that did not solve the problem and now need someone with a jetter. That is two call-outs for one drain.
• Subcontracting. Some plumbers pass drain work to a drainage company and add their own margin on top. That is not dishonest if it is declared, but you are paying for the middleman.

None of this means a plumber is overcharging. It means an hourly rate suits work where the time is predictable, and underground blockages often are not.

How does a drainage company price the same job differently?

A drainage company usually prices by the type of job and the time of day, with the jetter and camera already on the van. The price reflects clearing a drain, not the hours it takes.

Because drain clearance is the whole business, the equipment for a stubborn blockage is there on the first visit rather than the second. That changes where the risk sits. Under an hourly rate, a slow job costs you more. Under a price agreed by job type, a slow job costs the firm more. Our drain clearance service works this way: a fixed fee for the job and time band, agreed before we attend, with anything found beyond the original blockage, such as a cracked pipe or a displaced joint, quoted and itemised separately rather than added to the bill. If you are weighing the two pricing models on their own terms, our guide to fixed price versus hourly drain unblocking works through which one tends to come out cheaper.

When is a plumber the cheaper call?

When the blockage is in a single fitting and everything else in the house drains normally. That is a waste pipe or a trap, not a drain, and a plumber is often the right person to clear it.

Calling a drainage company for a blocked basin trap is the wrong answer, and we would say so on the phone. A plumber is also the sensible choice when:

• only one sink, bath or shower is slow, and the toilet and other fittings are fine;
• the blockage is in the trap or the pipe just below the fitting, which you can often see once the panel is off;
• the plumber is already booked for other work, so clearing the waste adds a short spell to a visit you are paying for anyway;
• the problem is a leaking or badly fitted waste pipe rather than a blockage at all.

The signs that point the other way are a toilet that rises when you run a tap, gurgling from more than one fitting, a smell from outside, or water standing in a manhole or gully. Those are drain problems, and paying a plumber to confirm that before paying someone else to clear it is the most expensive route.

What should you ask before booking a plumber or a drainage firm?

Ask the same questions of both, and compare the answers rather than the headline rate. A firm that answers all of them before arriving is far less likely to surprise you on the invoice.

• Do you clear underground drains yourselves, or pass that work on?
• Do you carry a jetter and a drain camera on the van, or only hand rods?
• Is the price fixed for the job, or charged by the hour? If hourly, how is time after the minimum billed?
• What do I pay if the blockage is not cleared on this visit?
• Is there a separate call-out charge, and does it change in the evening or at night?

The last question is worth pressing, because attendance is the part most often left off a quote. Our piece on whether drainage companies charge a call-out fee explains the different ways attendance is charged and what each one should include. If you are not sure whether your blockage is a plumbing job or a drainage one, describe what is happening when you get in touch and we will tell you which to book, even if the answer is a plumber.