Drainage & CCTV surveys — London
Drainage and CCTV Drain Surveys London
Blocked drain clearance, high-pressure jetting, CCTV drain surveys and relining across London terraces, flats and commercial units. Every survey is recorded and reported so you know exactly what condition your drain is in, whose responsibility it falls under, and what — if anything — needs fixing, before any digging or excavation is discussed.
£150–£350
Typical London CCTV drain survey cost (2025)
366,000+
Sewer blockages Thames Water attends across its region yearly
£1,000+
Typical cost of unnecessary excavation avoided by an accurate survey
100+ years
Age of much of central London's Victorian brick sewer network
On this page
What a CCTV drain survey actually shows you
A CCTV drain survey is a camera inspection of the inside of a drain or sewer pipe, recorded as it travels the full run from an access point — usually a manhole or rodding eye — to the point of connection with the public sewer. Rather than guessing at the cause of a recurring blockage or a bad smell from ground level, the camera shows the actual condition of the pipe: cracks, root ingress, displaced joints, fat and scale build-up, or a genuine structural collapse. The footage is logged against distance markers, so a defect found "4.2 metres from the rear manhole" can be located precisely for repair without speculative digging.
London's drainage network makes this kind of certainty particularly valuable. Large parts of inner London still run on Victorian brick combined sewers well over a century old, while later extensions, loft conversions and paved-over gardens have added new connections onto pipework never designed to carry the load. Terraced streets frequently share a single drain run serving four, six or more properties before it reaches the public sewer, which means a blockage at your property can just as easily originate from a neighbour further up the line, or from a shared section that falls under different rules to your own private drain.
This is also where responsibility becomes a genuine legal question, not just a plumbing one. Under the Water Industry Act, most sewers that were originally private and served more than one property were transferred to water companies in 2011, meaning many of what look like "shared" or "private" drains in London are now legally Thames Water's responsibility to repair, even though they sit under your garden. A CCTV survey report that clearly marks where your private drain ends and the public or transferred sewer begins is often the single most useful document in resolving who pays for a repair.
Scope of work
Drainage and CCTV services we provide across London
From an urgent blocked drain to a pre-purchase survey on a property you are about to buy, the same recorded, evidence-based approach applies throughout.
Emergency blocked drain clearance
Same-day attendance for blocked toilets, sinks, gullies and manholes that are backing up or overflowing. We clear the immediate blockage first using rodding or jetting, then assess whether a CCTV survey is needed to establish why it happened and whether it is likely to recur.
CCTV drain surveys
A full recorded camera survey of the drain run, showing pipe condition, joint alignment, root ingress and any structural defects. You receive the footage along with a written report marking defects by distance and severity, so any recommended repair is backed by visual evidence rather than assumption.
High-pressure water jetting
Water jetting at controlled pressure clears fat, scale, silt and root growth from the full internal diameter of a pipe, restoring flow far more thoroughly than rodding alone. Used both reactively for a blocked drain and proactively for drains with a history of recurring problems.
Drain relining and patch repair
For cracked, displaced or root-damaged pipework, a resin liner or localised patch repair can restore structural integrity from inside the pipe without excavating the garden, driveway or floor above it. This is usually significantly cheaper and less disruptive than dig-and-replace where the defect and access allow for it.
Homebuyer and pre-purchase drain surveys
A full CCTV survey of the drainage serving a property you are buying, carried out before exchange, identifies defects, misconnections or shared-drain issues that a standard building survey does not cover. The report gives you leverage to renegotiate price or repair costs before you are legally committed.
Shared and party drain investigation
Where a blockage or defect affects a drain run shared between neighbouring properties, we trace the full route, identify each property's connection point, and produce a report that clarifies where responsibility sits — including whether the section in question has transferred to Thames Water.
When to act
Warning signs your London drains need investigating
Drain problems are often dismissed as a one-off until they become an emergency. These signs usually indicate an underlying issue a camera survey should confirm.
Recurring blockages at the same fixture
A toilet, sink or gully that blocks repeatedly despite being cleared each time almost always indicates a structural or root-related problem further down the pipe run, not a fresh blockage each time. Clearing the symptom without a survey to find the cause means the same call-out happens again within weeks.
Gurgling sounds from toilets or sinks
A gurgling noise when a nearby fixture is used, or when it rains heavily, suggests air is being trapped or displaced by a partial blockage or a defect in the pipe run. It is often the earliest audible warning before a full blockage develops.
Bad smells from drains, gullies or manholes
A persistent sewage or drain smell, particularly one that is stronger after rain or that lingers near an external gully, points to a blockage, a cracked pipe allowing gas to escape, or standing water in a section that is not draining away properly.
Slow-draining sinks, showers or baths across the property
When more than one fixture in the property drains slowly at the same time, the cause is more likely to be a shared section of pipe downstream rather than an isolated blockage at each fixture. This pattern is a strong indicator that a CCTV survey of the main drain run is worthwhile.
Damp patches, subsidence or lush grass near the drain route
A cracked or displaced drain leaking below ground can cause soft, sunken or unusually green patches of ground above its route, and in more serious cases contribute to subsidence near the property. This is a structural warning sign that should not wait for a full blockage to develop.
Manhole covers overflowing or slow to clear after rain
A manhole that regularly fills close to the cover, overflows during heavy rain, or takes an unusually long time to clear afterwards suggests a restriction or partial collapse downstream, potentially in the section that has transferred to Thames Water's responsibility.
How it works
How a drainage callout or CCTV survey works, step by step
Whether the job starts as an emergency blockage or a planned survey, the process is built around getting clear visual evidence before recommending any repair.
01
Initial call and triage
We ask what has been noticed — a blockage, a smell, a slow drain, or a routine pre-purchase check — and how urgent it is. Genuine emergencies (sewage backing up into the property) are prioritised for same-day attendance; planned surveys are booked at a convenient time.
02
Access point identification
On site, we identify the relevant manholes, rodding eyes and inspection chambers serving the property, and check for any obvious external signs — smell, standing water, damaged covers — before opening anything up.
03
Clearance first, where there is an active blockage
If drains are actively blocked, we clear the immediate obstruction using rodding or jetting so the property is usable again, before any camera survey takes place. There is little value in surveying a pipe still full of waste water.
04
CCTV camera survey
A push-rod or crawler camera is run through the drain from the access point, recording continuously and logging defects against distance travelled. The full run is surveyed, not just the section immediately suspected, since problems often exist further along than expected.
05
Report and responsibility mapping
You receive the recorded footage and a written report identifying each defect, its severity and location, and — where relevant — marking where your private drain ends and the shared or public sewer begins, so responsibility for any repair is clear before work is agreed.
06
Repair recommendation and sign-off
Where repair is needed, we set out the options — jetting, patch repair, relining or, in the minority of cases, excavation — with a price for each, and explain why one is recommended over another. Once complete, a follow-up check confirms the drain is running clear.
Buyer guide
How to choose a London drainage and CCTV survey specialist (and avoid being overcharged)
Drainage is an area where it is easy to be sold unnecessary excavation, because most customers cannot verify underground pipe condition themselves. These checks help you hire someone who works from evidence rather than upsell.
Insist on recorded footage, not just a verbal opinion
A proper CCTV survey always comes with recorded footage you can review yourself, not just an engineer's summary of what they saw. If a company will not provide the footage, or only offers a spoken assessment, there is no way to verify the diagnosis or get a second opinion later.
Get an itemised quote separating survey and repair costs
The survey fee and any recommended repair should be quoted separately, with the repair price confirmed only after the defect is actually seen on camera. Be cautious of a single bundled price quoted before any camera has gone down the drain, since the scope of work is not yet genuinely known.
Ask who is responsible before agreeing to pay for a repair
Many drains that look private in London have transferred to Thames Water's responsibility since 2011, particularly shared sections serving multiple properties. Before paying for a repair yourself, ask the surveyor to confirm in the report whether the defect falls on your side of the boundary or the water company's, since misattributed repairs are a common and avoidable cost.
Be sceptical of excavation being proposed as the first option
Relining and patch repair now resolve the large majority of cracked or displaced pipe defects without digging up a garden, driveway or floor. If excavation is recommended immediately, ask specifically why a no-dig repair is not suitable for the defect found, and get that reasoning in writing.
Check how call-out and after-hours charges apply
Emergency drain clearance, particularly evenings and weekends, often carries a higher call-out rate than a scheduled daytime visit. Ask for the applicable rate before booking, and confirm whether the quoted price includes clearance only or clearance plus an initial camera check.
For a pre-purchase survey, get the report before you commit
If you are buying a property, commission the drain survey with enough time before exchange to act on the findings — renegotiating price, requesting the seller arrange repairs, or simply proceeding with clear knowledge of what you are taking on. A survey booked after exchange has already lost its main value as leverage.
2025 pricing
Drainage and CCTV survey costs in London (2025)
These are indicative London price ranges for 2025. Costs vary with pipe length, number of access points and whether the job is an emergency call-out or a scheduled visit.
| Job | Detail | Price range (2025) |
|---|---|---|
| Standard CCTV drain survey | Single drain run, recorded footage and report | £150 – £350 |
| Homebuyer pre-purchase survey | Full property drainage, detailed report | £200 – £400 |
| Emergency blocked drain call-out | Clearance via rodding, same-day | £120 – £250 |
| High-pressure jetting | Full-bore clean of fat, scale or roots | £180 – £400 |
| Patch repair (localised) | Resin patch over a single defect, no-dig | £350 – £700 |
| Drain relining (per section) | Full resin lining of a damaged run | £800 – £2,500 |
Where a defect turns out to sit within a section that has transferred to Thames Water's responsibility, we flag this clearly in the report rather than proceeding to a chargeable repair on your behalf. Excavation, where genuinely required, is quoted separately once access and reinstatement needs are known, and is always presented alongside the no-dig alternatives considered.
Get started
Drainage and CCTV Drain Surveys London — get a clear quote
Tell us about the property and the job. A qualified engineer confirms the scope, agrees a price before work starts, and issues the correct certificate on completion. All 33 London boroughs covered.
Common questions
Drainage and CCTV Drain Surveys London: frequently asked
How do I know if a drain problem is my responsibility or Thames Water's?
In general, the pipework inside your property boundary serving only your home is your responsibility, while the public sewer beyond your boundary is the water company's. The complication in London is that since 2011, many previously private shared drains serving more than one property automatically transferred to water company ownership under the Water Industry Act. A CCTV survey report that marks the exact boundary point is usually the clearest way to establish which side of that line a defect falls on before agreeing to pay for a repair.
What does a CCTV drain survey actually involve?
A camera on a push-rod or self-propelled crawler is fed through the drain from an access point such as a manhole or rodding eye, recording continuously as it travels. The footage is reviewed and any defects — cracks, root ingress, displaced joints, blockages — are logged against the distance from the access point, so their exact location is known. You receive both the footage and a written report, which is what most insurers, solicitors and water companies require as evidence before acting.
Can a blocked drain always be cleared without a full survey?
A first-time blockage can often be cleared with rodding or jetting alone, without needing a camera survey. A CCTV survey becomes worthwhile when a blockage recurs, when clearance alone does not restore normal flow, or when there are signs — smells, gurgling, damp patches — suggesting a structural cause rather than a simple obstruction. Surveying before repeated call-outs is usually cheaper than paying for the same emergency clearance multiple times.
Do I need a drain survey before buying a London property?
It is worth strongly considering one, particularly for period conversions, terraces with shared drain runs, or any property with a history of damp or drainage complaints. A standard building survey typically does not include a camera inspection of the drains. A dedicated pre-purchase drain survey can reveal defects, misconnections or shared-responsibility issues that would otherwise only surface after you have already exchanged contracts.
How long does drain relining take compared to digging up the pipe?
Relining a section of drain typically takes a matter of hours to a single day, since the resin liner is fed and cured inside the existing pipe without excavation. Traditional dig-and-replace repair, by contrast, can take several days once excavation, pipe replacement and reinstatement of the surface above (paving, garden, driveway) are all accounted for. Relining is usually the faster and less disruptive option where the defect and pipe condition allow for it.
What causes recurring blockages in London terraced houses?
The most common causes are fat, oil and grease build-up narrowing the pipe over time, tree root ingress through aged joints in older brick or clay drains, and structural defects such as displaced joints or partial collapses in Victorian-era pipework. Shared drain runs serving multiple terraced properties can also mean a blockage originating at a neighbouring property backs up into yours, which a CCTV survey traced along the full run will usually reveal.
Will I need planning permission or building control approval for drain repairs?
Routine repair, relining or jetting of an existing drain generally does not require planning permission or Building Regulations approval, since it is maintenance of an existing system rather than new work. Diverting a drain, building over one, or altering its route as part of an extension does typically require Building Regulations sign-off and, in some cases, a build-over agreement with the water company, so it is worth checking early if the drain survey reveals work near a planned extension.