Blocked drains cleared in London

London's drainage infrastructure is among the oldest in the world. Much of inner London still relies on Victorian-era combined sewer systems — pipes designed in the 1860s and 1870s that carry both surface water and foul sewage in the same channel. These pipes are predominantly clay, which makes them prone to joint failure as the ground around them shifts. London's clay soil expands and contracts seasonally, gradually misaligning pipe sections and creating ledges where debris accumulates.

Tree root intrusion is a particular problem across south London, where large mature trees line Victorian terraces. Roots seek out moisture, and a hairline crack in an ageing clay drain is enough for a root system to enter and, over years, fill the bore of the pipe entirely. We regularly carry out CCTV surveys in areas like Streatham, Tooting and Dulwich where root-related drain collapse is significantly more common than the London average.

Fat, oil and grease (FOG) build-up is the leading cause of blockages in kitchen drainage across all London boroughs. Cooking fat solidifies at around 40°C — well above the temperature of the cold water used to rinse dishes. Over weeks and months it accumulates on pipe walls, eventually restricting flow entirely. Thames Water estimates that over 75% of London sewer blockages are caused by FOG and wet wipes.

Our primary method for clearing FOG blockages is high-pressure water jetting — a 3,000–4,000 psi jet that breaks up fat deposits and flushes debris through to the sewer. For solid obstructions such as foreign objects or compacted debris, we use electro-mechanical rodding. Simpler partial blockages in accessible pipework respond well to hand rodding, which avoids the risk of dislodging fragile joints in older clay pipework.

For unexplained, recurring or severe blockages, we deploy a push-rod CCTV camera to inspect the drain from the access point to the sewer connection. This identifies cracks, root intrusion, pipe collapse, misaligned joints and deposits that jetting alone cannot resolve. A CCTV drain survey is also strongly recommended before purchasing any London property — particularly Victorian terraced houses — where the drainage condition is rarely disclosed and costly to repair retrospectively.

A single slow drain is usually a localised blockage — hair in a shower trap, or grease coating a kitchen drain pipe. But when multiple fixtures drain slowly at the same time, the problem is almost always in the main drain rather than any individual branch. This is a partial main drain blockage and requires jetting or rodding of the shared pipework, not just the individual fixture.

Gurgling sounds from toilets or floor gullies when other fixtures drain are caused by air displacement — a sign that the drain is partially obstructed and water is pulling air through trapped sections of pipe. Left unattended, a partial blockage will become a full blockage. A sewage smell without visible water backup often indicates a fracture in the drain below floor level or in an underground section, allowing gases to escape into the building. This needs a CCTV survey to locate precisely.

For emergencies — where a blocked drain is causing active flooding inside the property or sewage is backing up into ground floor fixtures — we attend same day across all 33 London boroughs. Our engineers carry both jetting equipment and CCTV cameras on the van, which means we can diagnose and clear in a single visit where possible.

On the question of landlord responsibilities: under Section 11 of the Landlord and Tenant Act 1985, landlords are required to keep drainage in working order. A one-off blockage caused by a tenant flushing inappropriate items is the tenant's responsibility. However, repeated blockages caused by pipe condition — scale build-up, partial collapse, inadequate pipe fall — are a structural issue and the landlord's obligation to repair. We provide written CCTV reports suitable for insurance claims and tenancy dispute evidence.

With over 180 verified reviews across Checkatrade and MyBuilder, Prestige Engineers have been clearing London drains for years. We give you a clear price before any work starts — no surprises, no hidden call-out charges. All our plumbing engineers are fully qualified, and our business also holds Gas Safe registration for properties where drainage work overlaps with gas appliance servicing.