A drain survey answers the question it was asked

6 November 2026

The most common disappointment with a drain camera survey is not a poor camera or a careless operator. It is a report that answers a different question from the one the buyer had in mind. A survey commissioned during a house purchase, one ordered before an extension and one requested by a landlord tired of repeated blockages can use the same equipment and produce very different value.

Three reasons people commission a survey

Buying a property. The buyer wants to know whether the drains are in reasonable condition and whether anything will need money spent on it soon. The useful output is a clear account of the defects found, their likely significance and which sections could not be inspected.

Building work. An extension near or over a drain or sewer raises questions about the pipe's position, depth and condition before anything is built on top. Where a public sewer is involved, the drainage layout and pipe condition need to be clear to the people reviewing the proposed work.

Recurring defects. A drain that blocks again and again usually has a cause: root entry, a displaced joint, a low section that holds water, or deposits that were never fully removed. The survey here is diagnostic, and the buyer needs findings precise enough to decide on a repair.

What shapes the survey itself

The camera can only see what it can reach. Access points, pipe diameter and whether the line is full of water or debris all limit the inspection. Different camera equipment is used for different pipe sizes and access arrangements. Sometimes the drain has to be cleaned before a meaningful survey is possible, which is a separate decision with its own cost. A buyer who knows these limits in advance reads the report more fairly.

Where the limits lie

A CCTV survey records what the camera saw on the day. It does not prove a pipe is watertight, and it cannot comment on sections it never entered. Good reports say so plainly, listing the lengths surveyed and any that were abandoned, with the reason. That honesty is more useful to a solicitor, a building inspector or a landlord than a confident summary that glosses over gaps.

Commissioning with the end use in mind

Someone looking for CCTV drain surveys is usually facing a decision, not idly curious. The site that serves them best explains which survey suits which situation, what a camera inspection can establish and where its limits lie, so the reader knows which details to ask the surveyor to record. The habit worth adopting is to tell the surveyor who will read the report and why. A conveyancing solicitor, a building control officer and a repair contractor each need something slightly different, and a surveyor who knows the audience can record the right detail first time.