About the CCTV Drain Survey

A CCTV drain survey sends a motorised camera through your drain pipes to produce a real-time video of everything inside — blockages, cracks, root intrusion, displaced joints, and pipe deformation — without any digging. It is the most reliable way to understand the condition of a drainage system, and it has transformed how drain problems are diagnosed and repaired.

How a CCTV Drain Survey Works

Our engineer feeds a push-rod camera into the drain via an access point — usually a manhole, inspection chamber, or rodding eye. The camera head is mounted on the end of a flexible cable, and as the cable is pushed further into the pipe, the engineer monitors a live feed on a screen beside them. The camera records the full run in HD video, and the engineer notes the distance reading at the point of each defect.

At the end of the survey, you receive a written report describing what was found, where it was found (precise distances along the pipe run), and what the appropriate remedy is. The video recording is usually included so that other contractors or insurers can review the findings independently.

Modern survey cameras are compact enough to enter 100mm diameter household drain pipes and robust enough to navigate bends, junctions, and partially collapsed sections. Some surveys use crawler cameras — self-propelled units with their own lighting — for larger pipes or situations where a push-rod camera would not reach.

What a CCTV Survey Reveals

The camera picks up detail that would be invisible any other way:

• Root intrusion — roots enter pipes through hairline cracks in clay joints and grow progressively. The camera shows the exact location and extent, which determines whether clearing alone is sufficient or whether the entry point needs to be sealed with a patch liner.
• Displaced or offset joints — ground movement, frost, and nearby tree roots cause clay pipe joints to shift out of alignment. An offset joint creates a ledge inside the pipe that catches tissue, fat, and debris. This is one of the most common causes of recurring blockages, and it can only be confirmed by camera.
• Pipe deformation and collapse — older clay pipes deform under sustained ground pressure, becoming egg-shaped or partially collapsed. Severe deformation restricts flow significantly.
• Cracks and fractures — hairline cracks do not immediately block the drain but allow ground water to infiltrate, which can cause sinkholes and settlement over time. They are also entry points for roots.
• Fat and scale build-up — the camera shows how heavily the pipe walls are coated, which informs the jetting pressure and technique needed for a thorough clearance.
• Structural integrity of chambers — the camera can be pointed upward inside a manhole to inspect the chamber walls and benching.

When You Need a CCTV Drain Survey

A survey is the right starting point in several situations:

Recurring blockages. If a drain has been cleared multiple times in the past two years and keeps blocking again, something structural is retaining debris each time. A survey finds it.

Pre-purchase property inspection. Many conveyancers now recommend a drain survey alongside a structural survey when buying a property. Drain repairs — particularly those involving excavation — can run to thousands of pounds. Knowing before you exchange gives you the option to renegotiate the price or require the seller to remedy the defect.

Following a ground disturbance. New tree planting or removal nearby, road works, an extension, or a neighbouring excavation can all disturb buried drain pipes. A survey confirms whether the disturbance has caused any movement or cracking.

Damp, subsidence, or unexplained sinkholes. A leaking drain pipe is a surprisingly common cause of localised subsidence and damp ingress. A survey can confirm or rule out drain leakage as the cause.

Insurance claims. Insurers frequently require a CCTV survey report as part of the evidence package for a drain-related insurance claim. The timestamped video report constitutes a contemporaneous record of condition.

Planning for a drain repair. Before committing to a repair — whether jetting, relining, or excavation — a survey defines the scope precisely. Without a survey, contractors can only estimate based on symptoms, which can lead to underquoted work that expands on the day.

What Happens After the Survey

Once the survey is complete and the report produced, the next steps depend on what was found. A straightforward build-up of grease or silt needs a high-pressure jet — the survey is done, and the jetting can follow immediately in the same visit if equipment is available. Root intrusion needs root cutting and, to prevent recurrence within a year, a patch or full CIPP liner to seal the crack permanently. A displaced joint that is causing repeated blockages is best addressed with a short-section liner. A collapsed pipe section requires either a full-length liner (if the pipe can still take the equipment) or targeted excavation.

The survey gives both parties — you and the drainage contractor — a shared understanding of what the drain actually looks like, rather than a best guess from symptoms alone. That is why CCTV has become the baseline for any drain work that goes beyond a straightforward clearance.

London Drain Clear Ltd carries out CCTV drain surveys across Enfield, Barnet, Edgware, Wembley, Cheshunt, Potters Bar and Southgate. If you have a drain problem that has not resolved with clearing, or you want a survey before purchasing a property, get in touch via our contact form.