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Blocked Drains in Harrow

We clear blocked drains for homeowners and landlords across Harrow and the surrounding area, usually on the same day you call. Our engineers arrive with high-pressure jetting equipment and drainage rods, locate the blockage, and clear it without digging wherever possible. Most homeowners call us when water is backing up out of a gully, a manhole is overflowing, or several drains in the house have slowed down at once.

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What blocked drain clearance involves

Clearing a blocked drain means finding where the obstruction sits in the pipe run and removing it without damaging the pipe. An engineer starts at the nearest accessible chamber, checks which sections are running and which are holding water, and works out where the blockage is between them. Most blockages are then cleared with drain rods or high-pressure water jetting. Jetting uses a hose fed down the pipe that fires water backwards at the pipe walls, cutting through the blockage and scouring the build-up that caused it. The job is finished by running water through the system to confirm the flow has returned along the whole run, not just at the point of the blockage.

When you need a blocked drain cleared

The clearest sign is water that will not drain away, or that comes back up somewhere it should not. An overflowing outside gully, a manhole with standing water in it, or a toilet that rises and drains slowly all point to a blockage in the drain run rather than the fixture itself. A smell of sewage outside the property is another common sign, because trapped waste sitting in a blocked pipe gives off gas. If more than one appliance is draining slowly at the same time, the problem is almost certainly in the shared drain rather than in any single sink or toilet, and rodding one fixture will not fix it.

Why drains block

Household drains block for a small number of predictable reasons. Fat, oil and grease poured down a kitchen sink cool in the pipe and harden onto the walls, gradually narrowing the bore until waste can no longer pass. Wet wipes, sanitary products and kitchen roll do not break down the way toilet paper does and snag on joints and bends. Outside, tree roots find their way into cracked or open pipe joints looking for moisture and grow into a mass that catches everything passing. In older properties, sections of clay pipe crack or drop at a joint, creating a lip that collects debris. Knowing which of these caused the blockage matters, because a blockage from roots or a collapsed pipe will return within weeks unless the pipe itself is dealt with.

What affects the cost of clearing a blocked drain

The main factor is how long the job takes, which depends on where the blockage sits and how it is reached. A blockage close to an accessible chamber that clears with rods is the quickest and cheapest kind of job. A blockage deep in a run, under a building, or in a shared drain takes longer to locate and usually needs jetting. Access matters too: a chamber in an open driveway is straightforward, while one under a decking or a locked side return adds time. Jobs called out at night, at weekends or on bank holidays cost more than a weekday appointment. If the cause turns out to be a structural fault rather than a blockage, clearing the drain is only the first visit and a repair is quoted separately.

Clearing the blockage or repairing the drain

Clearing the blockage restores the flow. Repairing the drain stops it happening again. Where the cause is fat, wipes or a one-off obstruction, clearing is the whole job and no further work is needed. Where the cause is root ingress, a cracked pipe, a dropped joint or a section that has partially collapsed, clearing buys you time but the blockage will return, often within a few months. The way to tell the two apart is a camera survey after the drain is clear, which shows the condition of the pipe and whether anything structural is causing waste to catch. We would rather tell you a drain needs repair than clear the same blockage three times.

Common questions

How quickly can you clear a blocked drain?

For blocked drains in Harrow we aim to be on site within 60 to 90 minutes of your call, and most blockages are cleared within an hour of arriving. We work 24 hours a day, so an evening or weekend blockage does not have to wait until Monday.

Do you charge a call-out fee?

No. We quote a price for the job over the phone before we set off, based on what you describe and where the drain is. You agree the price before an engineer is booked in, and it does not change once we arrive unless you ask for extra work.

Will clearing the drain damage my pipes?

High-pressure jetting is safe on drainage pipe in sound condition, and our engineers set the pressure according to the pipe material and its age. Where a pipe is already cracked or has dropped at a joint, jetting can expose the damage that was there beforehand, which is why we recommend a camera check after clearing if a drain has blocked more than once.

Is the blocked drain my responsibility or the water company’s?

Drains inside your property boundary that serve only your home are your responsibility. Shared drains and the sewer beyond your boundary are normally Thames Water’s. If we find the blockage sits in a shared or public section, we will tell you, and you can report it to them at no cost rather than paying for the work.

Can I clear a blocked drain myself?

A slow sink or a recently blocked toilet is sometimes worth trying with a plunger or a set of rods from a DIY shop. If the blockage is outside, if a manhole is holding water, or if more than one fixture is affected, the obstruction is usually too far down the run to reach that way, and forcing rods into a damaged pipe can make the situation worse.

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