Blocked Drains & Drain Unblocking in Hounslow & Southall

Your responsibility runs from the property to the boundary of your land; once a drain crosses that boundary and becomes a shared lateral serving other properties, or joins the public sewer, it's Thames Water's. A CCTV survey settles this precisely by showing exactly where the blockage sits relative to your boundary. We'll tell you honestly which side it falls on before quoting anything — if it's Thames Water's problem, that's who you need to call, not us.

Unblocking is the general term for clearing a blockage, most often by rodding a single fixture like a sink or toilet — it's the fastest option for a straightforward, isolated clog. Jetting uses controlled high-pressure water to cut through fat, scale or root intrusion and flush the line properly clean, and is usually the follow-up once a survey shows what's actually in the pipe. A CCTV survey is the camera inspection itself, which tells you the cause and exact location before either of the other two happens.

Southall's Victorian and Edwardian terraces were built out over a century ago along the Great Western Railway, and a large share of the original clay drainage is still in the ground. Clay pipe joints are exactly where tree roots find their way in, and mature street trees around Southall Green and along South Road have had a long time to do it. Fat and grease build-up compounds the problem in a town with a high density of subdivided flats and heavy kitchen use.

Yes, when the pressure is set to the pipe's actual condition rather than applied blind — which is exactly why a CCTV survey comes first. A camera run shows whether a clay drain is sound enough for standard jetting pressure or whether a gentler approach is needed to avoid stressing a pipe that's already compromised. Jetting blind into an unknown old drain is how you turn a blockage into a collapse; surveying first avoids that.

Standard unblocking typically runs £80–£250 depending on the fixture and how accessible it is, with a CCTV survey quoted separately based on run length. Jetting is priced once the survey confirms what's actually being cleared, since fat build-up, root intrusion and scale all take different amounts of time. Every figure is written down and agreed before work starts — there's no guessing after the fact.

In Southall's older terraces, it's overwhelmingly root ingress into ageing clay joints, followed by fat, oil and grease from kitchen use building up over years in properties that have often been subdivided into multiple flats. Elsewhere across Hounslow, Isleworth and Heston, the mix skews more toward fat and wipes-related blockages in bathrooms and kitchens, since the housing there runs newer and the drainage material is generally sounder. A CCTV survey identifies which one applies to your specific line rather than guessing from the symptom alone.

Yes, though for different reasons than the older terraces around them. The Green Quarter sits on the former Southall gasworks site and runs modern plastic drainage with none of the root-ingress issues that affect century-old clay pipe, but a densely occupied new development still sees plenty of fat, wipes and general misuse blockages. We survey and clear it the same way as any other property, adjusted for the different pipe material.

A typical residential survey — pushing the camera through a single run and recording what it finds — usually takes under an hour, including the write-up of where the problem sits and what it looks like. Longer or harder-to-access runs, particularly on a shared lateral serving more than one property, can take longer. You get a clear answer on cause and location before any decision on jetting or repair gets made.

Fat, oil and grease from cooking are the single biggest preventable cause we see — they set solid inside the pipe as they cool, catching everything that follows. Wipes, cotton buds and anything marketed as 'flushable' cause the same problem in toilets even though the packaging suggests otherwise. In an older Southall terrace with clay drainage already vulnerable to root ingress, avoiding those two habits meaningfully reduces how often a blockage recurs.

A blockage that returns to the same location almost always means something structural is causing it, not just an accumulation of debris — a root growing into a joint, a partial collapse, or a section where scale has narrowed the pipe. Rodding or jetting clears the symptom each time but not the cause, which is why a recurring blockage is exactly when a CCTV survey earns its cost. Once the camera shows what's actually there, the fix — root cutting, a spot repair, or a section relined — addresses the actual problem instead of the same recurring symptom.

Yes, if it's actively backing up into the property — sewage coming up through a downstairs toilet or a gully overflowing near the house counts as an emergency, not a routine booking. A drain that's simply slow, or gurgles occasionally, can wait for a scheduled CCTV survey. If you're not sure which applies, see [emergency plumbing](/emergency-plumbing) for what counts, or just call and we'll tell you over the phone.