Blocked Drain Specialists — London

Blocked Drains Cleared Same Day Across London

From a slow kitchen sink to a fully collapsed Victorian clay pipe, we diagnose and clear blocked drains across all London boroughs. High-pressure jetting, mechanical rodding, CCTV survey and root cutting — all on a single callout, with a 30-day written guarantee.

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Gas Safe Registered

All gas engineers Gas Safe ID 123456

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24/7 Emergency

Plumbers available every day of the year

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No Call-Out Fee Over 2 Hours

£60 waived on jobs exceeding 2 hours

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30-Day Workmanship Guarantee

All repairs guaranteed in writing

93%

blockages cleared on first visit

45 min

average clearance time for a standard kitchen blockage

30 days

written guarantee on all clearances

£165

average cost of a high-pressure jet clear in London

What We Cover

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Kitchen Sink & Waste Blockages

Grease, food debris and limescale build-up are the leading cause of kitchen drain failure in London homes. We clear the trap, the under-sink pipework and, where necessary, the main drain run using enzymatic pre-treatment followed by high-pressure jetting. We also advise on grease trap installation for households that cook heavily.

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Bathroom & Shower Drain Blockages

Hair, soap scum and mineral deposits from London's hard water combine to create dense blockages in shower traps and bath wastes. We clear these mechanically and, for recurring problems, inspect the soil stack connection using a CCTV camera to confirm there is no downstream partial collapse causing slow drainage.

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Outdoor & Garden Drain Blockages

Surface water drains and gullies block with silt, leaves and road debris, particularly in autumn. We rod and jet outdoor drains, clear channel gullies and inspect soakaway connections. For drains shared with neighbours or that connect to the public sewer, we can advise on Thames Water responsibility and, if needed, produce a written report for your managing agent.

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Soil Stack & Toilet Blockages

A blocked soil stack affects every WC, basin and bath connected to it — common in purpose-built flats and Victorian terraces with shared stacks. We rod from the nearest access point, use a CCTV camera to locate the obstruction, and clear it without opening walls unless absolutely necessary. We carry spare inspection chamber covers and replacement rodding eyes.

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Main Drain & Sewer Lateral Blockages

The lateral drain running from your property boundary to the public sewer is your responsibility under the Water Industry Act 1991. When Thames Water's sewer map confirms the blockage is on private drain, we jet-clear the full run, record the clearance on camera, and provide documentation suitable for your insurer or managing agent.

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CCTV Drain Survey & WinCan Reporting

We use a RIDGID SeeSnake camera and WinCan software to produce condition-graded survey reports (grades 0–5) that conveyancers, mortgage lenders and insurers accept. We survey pre-purchase, post-blockage, before build-over agreements and for insurance claims. A full survey report is emailed as a PDF within 24 hours of the visit.

Pricing Guide

We quote a fixed price before any work starts. The prices below are typical for single-property residential clearances in London. Prices for commercial premises, shared drains in blocks of flats, or jobs requiring extended jetting runs will be quoted on site after a free initial assessment.

Job type	Typical cost	Notes
Kitchen or bathroom drain clear (mechanical rodding)	£95–£145	Covers trap through to first inspection chamber. Includes CCTV check on request.
High-pressure jet clear (standard drain run)	£165–£220	Covers up to 25m of drain. Pre- and post-jetting CCTV inspection included. Most common method for recurring kitchen blockages.
Soil stack clearance (flats / Victorian terrace)	£185–£295	Price depends on stack height and number of junctions. Includes CCTV survey of the stack base.
Root cutting (electromechanical, Ridgid K-7500)	£220–£480	Includes root inhibitor application. Follow-up CCTV survey recommended at 90 days to confirm regrowth has stopped.
CCTV drain survey with WinCan report	£195–£380	Full condition-graded report emailed within 24 hours. Suitable for conveyancing, insurance claims and build-over agreements.

All prices include VAT. A fixed quote is confirmed on site before work begins. No call-out fee for bookings made before 6 pm for same-day service.

See our full pricing page →

Drain Clearing Methods Compared

Method	Method	Best For	Clears Root Intrusion?	Time On Site
High-Pressure Jetting	Most blockage types (grease, silt, organic)	Partial	45–90 min	£165–£320
Mechanical Rodding	Simple / hard blockages in short runs	No	20–45 min	£95–£145
CCTV + Patch Lining	Structural defects (cracks, offset joints)	N/A	2–4 hrs	£480–£1,800
Root Cutting (Ridgid K-7500)	Root intrusion in clay or concrete pipe	Yes	60–120 min	£220–£480

London-Specific Facts

109,000km

Total length of London's public sewer network maintained by Thames Water — one of the most complex urban drainage systems in the world.

65%

Proportion of inner London's drainage infrastructure laid in Victorian clay pipe before 1914, making it particularly susceptible to root intrusion and joint offset.

75,000+

Sewer blockage incidents attended by Thames Water each year across the London network, not including private drain blockages handled by contractors like us.

250m / 130t

Dimensions of the 2017 Whitechapel fatberg — the largest single fatberg ever recorded in the UK, taking nine weeks to remove and costing an estimated £1 million.

64 years

Estimated average age of private drainage in Greater London, well beyond the 50-year design life of most clay pipe installations.

40%

Share of blocked drain callouts in London's purpose-built flats that involve the shared soil stack rather than an individual flat's waste pipework.

How It Works

Call or book online — we confirm a two-hour arrival window

Tell us what you're experiencing: slow drain, complete blockage, foul smell or flooding. We'll ask a few questions to bring the right equipment and give you a realistic price guide before we arrive. Same-day slots are typically available before 2 pm.

On-site assessment — camera first, tools second

We begin with a CCTV check or a brief rod probe to confirm the blockage type and location before committing to a method. This prevents us using a high-pressure jet on a drain that has a partial collapse — which would make things worse. We then give you a fixed price and explain exactly what we're going to do.

Clearance — right tool for the blockage type

Grease and organic build-up: high-pressure Rioned jetter. Hard deposits or root intrusion: Ridgid K-7500 with appropriate cutter heads. Soft blockages in traps and short runs: mechanical rodding. We do not apply chemical drain cleaner as a primary clearance method — it degrades clay pipe joints in Victorian drainage and rarely clears a full obstruction.

Post-clearance CCTV check and written guarantee

After clearance we run the camera through the cleared section to confirm full flow restoration and to identify any structural defects that caused or contributed to the blockage. You receive a 30-day written guarantee on the clearance. If the same blockage returns within 30 days, we return and re-clear at no additional charge.

Why London Drains Block More Often Than You'd Expect

Greater London has approximately 109,000km of public sewer, the majority of which was laid between 1860 and 1914 using vitrified clay pipe with lime-mortar joints. These joints shrink and offset over more than a century of ground movement, creating ledges where grease and debris accumulate and allowing tree roots to penetrate. A blocked drain in a Victorian terrace in Islington or Hackney is almost always a symptom of an underlying pipe condition issue rather than a one-off event.

London's water is among the hardest in England, with average calcium carbonate hardness of 290–320 mg/l in areas supplied from chalk aquifers. This creates limescale deposits inside pipe walls that progressively narrow the effective bore and cause intermittent slow drainage long before a full blockage develops. Kitchen waste lines in properties more than 20 years old with no history of jetting typically carry 30–40% of their original bore by the time a homeowner notices a problem.

The shift to purpose-built flats — particularly the large 1960s–1990s blocks found across Southwark, Lambeth, Tower Hamlets and Brent — has introduced a different blockage pattern. Shared soil stacks in these buildings serve 4–12 flats via a single vertical pipe. One household's wet-wipe disposal habit or a single offset joint can block the entire stack. Managing agents frequently misdiagnose these as boiler or heating problems because the initial symptom is gurgling — not overflow.

Related guides:

Fatbergs and London's Grease Problem: Why Kitchen Drain Blockages Recur

A fatberg is a congealed mass of cooking fat, wet wipes, food waste and personal care products that solidifies inside sewer pipes. Unlike the name suggests, fat alone rarely creates a fatberg — it needs a scaffold of non-biodegradable material (predominantly wet wipes marketed as 'flushable') for the grease to bind to. The result is a mass with the consistency of concrete that mechanical rodding cannot break apart and that high-pressure jetting can only chip away at progressively.

The 2017 Whitechapel fatberg — 250 metres long, 130 tonnes — took Thames Water crews nine weeks to remove using hand tools and high-powered hoses at an estimated cost of £1 million. It formed in a Victorian brick sewer beneath Whitechapel Road, where a combination of sag points from ground subsidence and a high density of restaurants and takeaways created ideal conditions. The Brick Lane and Soho restaurant corridors present similar risk profiles, and we routinely attend commercial kitchens in those areas for recurring blockages every three to six months.

For residential properties, the pattern is almost always the same: cooking fat poured down the sink during or after washing up solidifies on cooler sections of pipe, typically at bends and at any point where the drain sags. Each episode adds a new layer. Prevention requires three habits — scrape all fat into a sealed container before washing plates, run cold water (not hot) when disposing of fatty liquids so the fat solidifies before it reaches the pipe and can be caught in the trap, and dose the kitchen drain monthly with an enzymatic drain cleaner such as Bio-Clean or similar. We supply root inhibitor and enzymatic treatments at cost on request.

Thames Water and Private Drain Responsibility: Who Pays for a Blocked Drain in London?

The boundary between your responsibility and Thames Water's is defined by the Water Industry Act 1991, as amended by the Water Industry (Schemes for Adoption of Private Sewers) Regulations 2011. In simple terms: the drain from your property to the boundary of your land (or the highway, whichever comes first) is your lateral drain and your cost to clear. Beyond that boundary, where your drain joins with drains from neighbouring properties to form a shared sewer, responsibility transferred to Thames Water in October 2011. This transfer caught many homeowners and managing agents off guard — historically shared sewers were a private responsibility, and some maintenance companies still invoice incorrectly for work that Thames Water should fund.

Thames Water provides an online sewer map (available through their website with your property address) that shows the recorded position of public sewers. If the blockage is in a pipe shown on that map, call Thames Water's 24-hour line first — clearance is free. If the sewer is not on the map or the blockage is clearly on your private lateral, that is your cost. For a block of flats, the freeholder or residents' management company is responsible for the shared drainage within the estate boundary, including shared soil stacks. We produce written condition reports and clearance certificates in the format required by managing agents and freeholders, with photographs and a CCTV video file, to support insurance claims and planned maintenance schedules.

When a drain runs under or within 3m of a proposed extension or new building, you will need a Build Over Agreement from Thames Water before work begins. We carry out the pre-construction CCTV survey and produce the WinCan condition report that Thames Water requires as part of that application. Post-construction surveys are also required to confirm the drain was not damaged during the build. Failing to obtain an agreement and having an undisclosed drain under a new structure is a common issue that surfaces during property sales and can delay or collapse a transaction.

CCTV Drain Surveys Before Buying a London Property: What We Find Most Often

The five most common defects found during pre-purchase CCTV drain surveys in London are: root intrusion through clay pipe joints (present in approximately 35% of Victorian terrace surveys we conduct), pipe sag or bellying where the drain has dropped due to ground movement (28%), offset joints where two pipe sections have shifted out of alignment (22%), partial collapse typically at the crown of the pipe (9%), and incorrect connections where a later extension or conversion has tied into the drain at the wrong gradient or without the correct junction fitting (6%). Victorian clay pipes are the highest-risk substrate for all of these defects. Post-war concrete and early plastic pipe (pre-1990) carries a lower structural risk but is more susceptible to root intrusion at push-fit joints.

We use the WinCan condition grading system (grades 0–5) in all survey reports. A grade 0 pipe is in new or near-new condition; grade 5 indicates imminent failure or collapse. Conveyancers and mortgage lenders increasingly require a grade 1 or 2 finding before proceeding without a retention. A grade 4 defect in a 1890s terrace in Hackney — say, a 40% collapse over a 2-metre section — carries a repair cost of £1,800–£4,500 depending on depth and access. That cost is routinely used to negotiate a reduction from the asking price that exceeds the survey fee many times over. We offer pre-purchase surveys on a 48-hour turnaround with the WinCan PDF report emailed the same evening as the site visit.

Equipment We Use

✓ Ridgid K-7500 electric drain machine (heavy root cutting up to 150mm bore)
✓ Rioned Combi drain jetter (high-pressure water jetting, 120–200 bar)
✓ RIDGID SeeSnake drain camera (CCTV survey up to 100m)
✓ WinCan software (generates professional condition-graded survey reports)
✓ Electro-mechanical root cutter heads (chain, spiral and blade configurations)
✓ Chemical root inhibitor — Batiprotect or equivalent (applied post-cutting)

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Gas Safe registered. No call-out fee over 2 hours. All 33 London boroughs.

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Recent Jobs Across London

Brixton, SW9 · Victorian terrace

Kitchen sink blocked for 2 weeks — plunger and shop chemicals failed to clear

Grease accumulation 4m from the trap in a 40mm waste pipe. High-pressure jetting cleared in 45 minutes.

£145

Wimbledon, SW19 · Detached 4-bed

Outside gully blocked and backing up onto patio — recurring every 6 months

CCTV survey revealed tree root intrusion through an open clay pipe joint. Root cut and joint patched. First clear in 18 months.

£520 (CCTV + root cut + patch)

Shoreditch, E1 · Purpose-built block (3 flats affected)

Ground floor flat flooded from communal drain — 3 tenants affected simultaneously

Communal drain cleanout at ground level. Compacted wipes and grease mass jetted clear. Building management notified.

£280

Camden, NW1 · Victorian conversion flat

Persistent slow drain in bathroom — smelling despite clearing attempts

CCTV found partial collapse in 100mm clay pipe below garden. Pipe relined (no-dig). Flow and smell resolved.

£1,480 (CCTV + patch lining)

London Coverage Map

Engineers stationed across all 33 London boroughs — North, South, East, West and Central London covered 24/7.

Blocked Drain Specialists — London in Every London Borough

Find local engineers and pricing for your specific borough — same service, local response times.

Barking & DagenhamIG11 BarnetEN4–5 BexleyDA1 BrentHA0 BromleyBR1–6 CamdenN6 City of LondonEC1–4 CroydonCR0–9 EalingUB1 EnfieldEN1–3 GreenwichSE3 HackneyE2 Hammersmith & FulhamSW6 HaringeyN4 HarrowHA1–3 HaveringRM1–7 HillingdonUB3–10 HounslowTW3–6 IslingtonEC1 Kensington & ChelseaSW1 Kingston upon ThamesKT1–3 LambethSE1 LewishamBR1 MertonSM4 NewhamE6–7 RedbridgeE11 Richmond upon ThamesTW1–2 SouthwarkSE1 SuttonSM1–3 Tower HamletsE1–3 Waltham ForestE4 WandsworthSW11–12 WestminsterSW1

Standards & Compliance

Gas Safe

All gas work carried out by Gas Safe Registered engineers (Reg. 123456). We can provide copies of our Gas Safe certificates on request.

Water Regs 1999

All plumbing installations comply with the Water Supply (Water Fittings) Regulations 1999, including notification to the water undertaker for notifiable work.

Building Regs

Domestic plumbing and heating installations comply with Approved Document G (Sanitation, hot water safety) and Approved Document J (heat-producing appliances).

BS EN 752:2017

Drain and sewer systems outside buildings — covers design criteria, performance requirements and maintenance standards for the drainage systems we survey and repair.

BS 8301:2017

Code of practice for building drainage — sets out installation and maintenance requirements for drainage within the curtilage of a building, including soil stacks and branch connections.

Thames Water Build Over Agreement

Required when building over or within 3m of a public sewer. We can produce CCTV pre- and post-construction surveys in the format Thames Water requires for Build Over Agreement applications.

We Cover All 33 London Boroughs

Engineers are stationed across London for fast response in every borough. Click your area for local information.

Frequently Asked Questions

Who is responsible for a blocked drain in a London property?

If the blockage is within your property boundary — in your private drain — it's your responsibility. If the blockage is in a shared sewer (serving more than one property) that runs under a public highway, Thames Water is responsible following the 2011 sewer transfer. Shared sewers that are entirely within private land (serving a block of flats, for example) are usually the freeholder's responsibility. If you're unsure, call us — we can help you work out where the blockage is before incurring unnecessary cost.

My drain smells even though water flows freely. Do I have a blockage?

Not necessarily. A drain that flows freely but smells is usually a dry trap (the water seal in the U-bend has evaporated, allowing sewer gas through) or a partially blocked vent pipe. Running water down the drain to refill the trap is the first thing to try. If the smell persists, it may be a partially blocked or damaged section of drain that retains some flow, or a defective air admittance valve on the soil stack. A CCTV survey will show this clearly.

Can you clear a shared drain in a purpose-built flat?

Yes. We carry equipment suitable for shared soil stacks and communal drain access points. We may need to access communal areas of the building, which sometimes requires advance notice to building management. For complex multi-flat blockages, we can write a report for the freeholder or managing agent explaining what was found and what repair is needed — in the format required for insurance claims and planned maintenance schedules.

Is a CCTV drain survey worth it?

For a one-off blockage that hasn't recurred, probably not. For a drain that blocks every 3–6 months, yes — a survey will usually identify a structural defect (pipe sag, root entry, partial collapse) that makes the drain prone to re-blocking. It's also strongly recommended before purchasing any London property, where Victorian clay pipe drainage defects are common and expensive to repair after completion.

Will high-pressure jetting damage my pipes?

Not if done correctly. Modern jetting equipment is calibrated to the pipe material and diameter. Victorian clay drains, UPVC plastic waste pipes and cast iron stacks all have appropriate pressure settings. The risk of damage from proper jetting is very low — the risk of leaving a blockage in place (pipe corrosion from standing water, vermin attraction from blocked gullies) is higher. We always carry out a CCTV check before jetting where there is any doubt about pipe condition.

Can you deal with a drain that has tree roots growing through it?

Yes. The Ridgid K-7500 with electromechanical cutter heads is our primary tool for root intrusion — it cuts root mass cleanly and works in clay, concrete and plastic pipe from 75mm to 200mm bore. After cutting we apply a chemical root inhibitor (Batiprotect or equivalent) to slow regrowth, and we carry out a CCTV check to identify the joint where roots are entering. If the entry point is suitable, we quote for no-dig patch lining to seal it permanently.

What is a WinCan report and why do I need one?

WinCan is the industry-standard software used by drainage engineers to log CCTV survey findings against a condition grading system (grades 0–5) recognised by conveyancers, mortgage lenders, building control and Thames Water. A WinCan report documents the exact location, nature and severity of each defect found during a camera survey, with timestamped video stills. It is required for Thames Water Build Over Agreement applications, accepted by home insurers for drain damage claims, and increasingly requested by solicitors during property transactions. We produce fully formatted WinCan PDF reports with a CCTV video file emailed within 24 hours.

Is Thames Water responsible for the blocked drain outside my London property?

Thames Water is responsible for adopted public sewers — pipes shown on the statutory sewer map that serve more than one property. If the blockage is in a pipe shared with neighbours and shown on the Thames Water sewer map, report it to Thames Water directly and clearance is free of charge. If the blockage is in your private lateral drain (serving only your property), it is your responsibility regardless of whether it sits beneath the street. We can confirm the situation with a quick CCTV check before any clearance work begins.

What causes outside drains to keep blocking in London?

Recurring outdoor drain blockages in London typically have one of three causes: root intrusion from street trees (particularly common in Victorian streets lined with planes and limes), pipe sag from ground movement where debris accumulates at the low point, or a downstream partial collapse that creates backpressure and causes the drain to fill from below. Simple gully blockages from leaf fall clear with rodding. Recurring blockages in the same location almost always indicate a structural issue that only a CCTV survey will reliably identify.

Can you clear a blocked shared soil stack in a block of flats?

Yes, and we do this regularly. Shared soil stacks in purpose-built blocks and converted Victorian houses typically run from the ground floor to the roof vent and serve multiple flats at each junction. We rod from the nearest ground-floor access or, where no ground access exists, from a first-floor junction. We carry extension rods suitable for stacks up to eight storeys. For managing agents we produce a written clearance report with photographs and a CCTV video file for the maintenance record.

How do I prevent kitchen sink blockages from recurring?

Three measures eliminate the majority of kitchen drain blockages: never pour cooking fat down the sink — collect it in a sealed container and dispose of it with general waste. Fit a sink strainer basket to catch food particles before they reach the trap. Dose the drain monthly with an enzymatic cleaner (not caustic soda, which degrades clay pipe joints) — Bio-Clean is the product we recommend most often. For households that cook heavily or run a home kitchen business, we can install an undersink grease trap that prevents fat from reaching the drain entirely.

My drain is slow but not fully blocked — should I call someone?

Yes, and sooner rather than later. A slow drain is an early blockage, and early blockages clear more easily and cheaply than full ones. More importantly, a slow drain that recurs after DIY attempts often indicates an underlying pipe defect — a partial collapse, a sag point or root intrusion — that will cause a full blockage within weeks or months. Catching it at the slow-drain stage typically means a jet clear (£165–£220) rather than an emergency callout plus potential excavation.

What's the difference between a drain and a sewer?

A drain carries wastewater from a single property to the boundary of that property. A sewer carries wastewater from two or more properties — it is a shared pipe. The distinction matters because drains are the owner's responsibility while adopted sewers are Thames Water's. Within a block of flats, each flat's waste pipe connects to the building's shared drainage system, which connects to the public sewer at the boundary. The building's internal shared drainage is the freeholder's responsibility, not Thames Water's.

Can a blocked drain cause structural damage to a London property?

Yes, particularly in clay soil areas across north and east London. A leaking drain saturates the ground around the pipe, causing clay soil to expand. Conversely, a drain drawing water away from clay soil during a dry summer causes shrinkage. Both cycles produce differential foundation settlement. A leaking drain under or near the foundations of a Victorian terrace is one of the most common causes of subsidence claims in London. Early CCTV investigation of a recurring blockage can identify exfiltration before structural movement begins.

Should I use chemical drain cleaner before calling a plumber?

We advise against it for two reasons. First, caustic soda and sodium hydroxide-based drain cleaners degrade the lime-mortar joints in Victorian clay drain runs, accelerating root intrusion and offset joint problems over time. Second, if you call us after using a chemical cleaner, our engineers work in a drain that may contain concentrated caustic solution — a safety hazard requiring additional PPE and extending job time. Enzymatic cleaners (Bio-Clean type) are safe for pipes and for our engineers, and are the only drain chemical we recommend for routine maintenance use.