Drain Jetting Service in London: How It Works and What It Costs

A drain jetting service clears a blocked or slow drain by firing high-pressure water through a specialist nozzle inside the pipe. The jet breaks up grease, silt, scale and debris, and the water flow carries the loosened material to an access point. It is the standard professional answer to repeat blockages, greasy kitchen lines and drains that rods only partly clear. At Evo Plumbers we quote every job at a fixed price before work starts, and our drainage team covers London around the clock.

This guide explains what jetting is, what it can and cannot clear, how engineers keep your pipes safe, what drives the price, and how to prepare for a visit.

TL;DR

• Drain jetting uses pressurised water and a matched nozzle to dislodge blockages and clean the pipe wall, then flushes the debris out.
• The right pressure depends on the pipe. Where the material or condition is unknown, industry guidance caps working pressure at 130 bar.
• A camera survey after jetting shows whether the blockage was a symptom of a crack, collapse or root ingress.
• Price depends on access, length, severity, time of day and whether a CCTV survey is added. Ask for a fixed quote before work begins.
• Hiring a pressure washer or jetter yourself risks damaged pipes and injury. A trained engineer is the safer route.

Table of Contents

• What drain jetting actually is
• What jetting can clear
• Jetting versus rodding and other methods
• Is it safe for your pipes?
• Can I unblock a drain myself or hire a jetter?
• What affects drain jetting cost
• How to prepare for a jetting visit
• Our perspective on drain jetting
• Book a drain jetting visit in London
• How to choose a drain jetting provider
• FAQ
• Sources

What drain jetting actually is

Drain jetting is the use of a powered water jet through a specialist nozzle inside a drain or sewer. The jet dislodges the obstruction and the deposits stuck to the pipe wall, and enough water volume then flushes the loosened material towards a manhole or other access point where it can be removed. The UK jetting guide from the plastic pipe industry body TEPPFA describes the process in exactly these terms, and stresses that the nozzle and pressure must be matched to the pipe and its condition.

Think of it as the difference between poking a hole through a blockage and actually cleaning the pipe. A drain rod or auger can open a channel through a plug of waste, but the grease film and sediment around it stay behind and start to build up again. A jet works the whole circumference of the pipe as the hose is pulled back, which is why jetting is the usual choice when a drain keeps blocking.

How the nozzle does the work

The hose carries pressurised water to a nozzle with several small jets. Rear-facing jets pull the hose forward along the pipe, and the water leaving those jets scours the pipe wall. Forward-facing jets break into the blockage itself. Different nozzles suit different jobs: some are designed to penetrate a hard plug, others to spread water wide and clean the wall, and others to cut roots.

Pressure and volume are not the same thing

Homeowners tend to ask how many bar or psi an engineer will use. Volume matters just as much. The TEPPFA guide explains that low-pressure, high-volume jetting generally removes blockages and cleans sewer pipes, because the flow is what carries debris away. In UK and European tests it reports, 120 bar with a 2.8 mm nozzle was enough to remove service blockages in plastic and other pipe materials, with high water volume carrying the debris to the manhole. More force is not automatically better, and a trained operator chooses the settings for the pipe in front of them.

What jetting can clear

Jetting is well suited to the build-up that causes most domestic and commercial drain problems:

• Grease and fat. Kitchen and restaurant lines coat with fat that hardens in the pipe. Water jetting removes it from the wall rather than just punching through it.
• Silt, sludge and general debris. Slow-moving drains collect sediment, especially on shallow gradients or in older pipework.
• Scale and deposits. Hard deposits narrow the bore over the years and catch everything else.
• Roots. Fine roots entering at a joint can be cleared with the right nozzle, although the joint then needs inspecting.
• Compacted blockages. Wipes, sanitary products and paper that have formed a dense plug downstream of a bend.

A UK explainer on how sewer jetting works describes the same principle: accelerated pressurised water dislodges blockages and strips deposits such as grease, roots and solid debris from the pipe wall.

What jetting will not fix

Jetting clears what is inside the pipe. It does not repair the pipe. If a drain has a collapsed section, a displaced joint or a badly offset connection, water may clear for a while and then block again. That is why the TEPPFA guide recommends reviewing the pipe’s condition afterwards and using CCTV to investigate whether a cleared blockage reflects cracking, collapse or another defect. If that is the case, you need a repair, not another jet.

Jetting versus rodding and other methods

On a first-time blockage in a sink waste, a plunger may be all you need. When the water backs up in a manhole, several fixtures slow at once, or the same drain blocks every few months, a jetting visit is the better route. Our drain unblocking service covers both: the engineer starts with what is likely to work and moves to jetting when the blockage calls for it.

Is it safe for your pipes?

Professional jetting is safe when the operator matches pressure to the drain. It becomes a risk when pressure is set too high for pipes in poor condition, which is why the assessment before the job matters as much as the jet itself.

The Effective Cleaning of Drains and Sewers manual recommends a maximum working pressure of 130 bar where pipe materials are unknown or mixed, or where drains and sewers are in structural condition grade 3, for example with fractures, some deformation or displaced bricks. TEPPFA reports the same 130 bar figure from the WRc Sewer Jetting Code of Practice and warns that excessive pressure can damage sewer pipelines in poor condition. It also reports that the plastic pipes in its tests tolerated 50 cycles without damage under the stated test conditions.

In practice, this means a good engineer will:

1. Establish the pipe material, size and layout, using inspection chambers and the age of the property as clues.
2. Check the operational and structural condition, and identify any obvious defects.
3. Start at a conservative pressure and choose the nozzle for the blockage type.
4. Stop and recommend a camera survey if something looks wrong.

Older London properties often have a mix of clay, cast iron and later plastic repairs on the same run. That is exactly the situation where “unknown or mixed” materials apply, and where a cautious approach is the right one.

Safety on site

High-pressure water can cause serious injury, so professional jetting follows a safe system of work. Contractor guidance on high pressure water jetting lists a suitable risk assessment, an exclusion zone to keep the public clear, and PPE including safety helmets, waterproof gauntlets, face shields and safety boots with metatarsal protection. The TEPPFA guide adds that jetting equipment should only be used by trained personnel and that the assessment should cover confined-space risks.

Can I unblock a drain myself or hire a jetter?

You can fix a slow sink with a plunger or a hand drain snake, and that is a reasonable first step for a simple trap blockage. Hiring a petrol pressure jetter or using a garden pressure washer on a main drain is a different matter.

• Pipe damage. Without knowing the pipe material and condition, you cannot choose a safe pressure. The guidance above exists because pipes in poor condition can be damaged by excessive force.
• Injury. High-pressure water can injure skin and eyes, and a nozzle can kick back from a pipe. Professionals use PPE and an exclusion zone for good reason.
• Splashback and contamination. Foul water can come back out of a gully or open inspection chamber.
• Misdiagnosis. Clearing a blockage without a camera means you do not learn whether a crack or collapse caused it, so the problem returns.
• Shared drains. Many London properties share a drain with neighbours, and a blockage may be downstream of your boundary and so outside your control.

If you have already tried a plunger and the water still backs up, stop there and call an engineer rather than escalating the force.

What affects drain jetting cost

Prices for jetting vary across London, and no single figure fits every job. The factors that move the price are consistent:

• Access. A clear external gully is quicker than a buried or hidden inspection chamber, or a drain reached only through a basement.
• Length and number of runs. Clearing one blocked run costs less than jetting every run on the property.
• Severity. Compacted fat, heavy scale or roots take longer than a soft blockage.
• Time of day. Out-of-hours and emergency callouts usually carry a higher rate than a booked daytime visit.
• Add-ons. A CCTV survey after jetting adds time and equipment, but it tells you why the drain blocked.
• Property type. Commercial kitchens and larger sites involve more pipework and often need regular maintenance jetting.

We do not publish a fixed price list for jetting because each drain is different. What we do is quote a fixed price for your specific job before work starts, so the figure you agree is the figure you pay on completion.

Watch for charges that should not be there

The Association of Plumbing and Heating Contractors has said that it is not best practice to charge extra for standard tools or equipment a contractor would carry regularly as part of the service. When you get a quote, ask what it includes: the callout, the jetting itself, the disposal of debris and any survey. A clear written quote should leave no room for extras appearing on the day.

How to prepare for a jetting visit

A little preparation makes the visit quicker and the diagnosis better.

1. Note the symptoms. Which fixtures are slow, which drain gurgles, where water backs up, and when it started.
2. Tell the engineer what you have tried. Chemical cleaners matter because they are a hazard to anyone opening the drain.
3. Clear access. Move bins, planters, cars and furniture from gullies, manhole covers and the route to them.
4. Locate the inspection chambers. If you know where they are, say so. If you share a drain, mention it.
5. Pass on history. Previous blockages, tree roots nearby, past repairs and any survey reports help the engineer choose a pressure and nozzle.
6. Keep children and pets indoors while the hose is in use.

What happens during the service

The engineer assesses the pipe and the site, sets up the work area, and feeds the hose into the drain through the nearest access point. The nozzle is worked along the run until the blockage clears and the wall is clean, with the water volume pushing debris to a collection point where it is removed. Afterwards, the drain should be flushed and tested for flow. If the cause is not obvious, a camera survey can follow so you get an answer and not just a temporary fix.

Our perspective on drain jetting

Most of the drain calls we hear about start the same way: someone has cleared a blockage, it has come back, and they are now on their third visit. In our view the fix is rarely a bigger jet. It is a proper assessment first, the right nozzle and pressure for the pipe, and a clear explanation of what was found.

That is how we approach every drainage job. We look at the pipe before we pick the pressure, we tell you if we think a camera survey is worth doing, and we give you a fixed quote before work begins so the price is never a surprise.

Drains do not choose a convenient time to fail. Our emergency line is answered around the clock across London, and our engineers are trained to treat a blocked drain as both an urgent problem and a diagnostic question: what is blocking it, and why?

the author

Book a drain jetting visit in London

If a drain keeps blocking, water is backing up or you want a greasy line cleaned properly, our engineers can assess it and quote a fixed price before starting. For an urgent blockage, use our emergency call out service, available 24/7 across London. For a planned visit, start with our drain unblocking page.

We also work in local areas including Putney, Wandsworth, Battersea, Fulham, Acton and Notting Hill. If a leak is suspected behind a recurring damp patch, our leak detection team can trace it.

How to choose a drain jetting provider

Whoever you hire, a few checks separate a thorough service from a quick, cosmetic one:

• A written fixed quote that says what is and is not included.
• A pressure and nozzle chosen for your pipe, not a single setting for every job.
• Trained operators using proper PPE and a safe work area.
• A camera survey offered when a blockage looks like a symptom of something else.
• A clear account afterwards of what was found and whether any repair is needed.
• Gas Safe registration matters if the same visit might touch gas appliances. You can check the register for any engineer who works on gas. Drain work itself does not need it, but a firm that holds it shows a professional standard.

For wider needs, such as repairs found by the survey, our plumbing services cover the follow-up work.

FAQ

How much does drain jetting cost?

The cost depends on access, how long the run is, how severe the blockage is, the time of day and whether you add a CCTV survey. Daytime booked visits usually cost less than emergency callouts. We give you a fixed quote for your job before work starts, and you pay on completion.

Is drain jetting worth it?

It is worth it when a drain blocks repeatedly or is coated with grease, scale or silt, because jetting cleans the pipe wall as well as clearing the plug. If the blockage came from a crack or collapse, jetting only helps temporarily, so a camera survey after the jet shows whether a repair is needed.

Can jetting damage my pipes?

It can if the pressure is too high for the pipe’s condition. Industry guidance sets a maximum working pressure of 130 bar where materials are unknown or the drain is in poor structural condition. A trained engineer assesses the pipe first and picks the pressure and nozzle accordingly.

Can I hire a drain jetter and do it myself?

You can hire equipment, but it carries real risks: damaged pipes, injury from high-pressure water and no diagnosis of the cause. For anything beyond a simple sink blockage, we recommend a trained engineer who uses the proper PPE and works to a risk assessment.

Sources

• TEPPFA Jetting Guide
• The Science Behind Sewer Jetting
• Effective Cleaning of Drains and Sewers, July 2021
• High Pressure Water Jetting, Guidance Note 36
• BBC Watchdog: Rogue flushes out dodgy plumbers
• Gas Safe Register

Recommended

• Drain Unblocking in London