Read a CCTV drain survey report by matching each recorded observation to its pipe section, location and supporting image. Then check what the finding means for flow or structural condition, what could not be inspected and which action is recommended. A defect code on its own is not a repair specification.
Start with the survey's scope and limitations
Check the property address, inspection date and reason for the survey. A pre-purchase assessment, a targeted blockage investigation and a post-repair inspection answer different questions. The report should make clear which accessible runs were included, rather than leave you to infer that the whole system was inspected.
Look for notes about standing water, heavy deposits, inaccessible chambers or an abandoned camera run. If an obstruction stopped progress, the pipe beyond it remains unassessed. Ask what clearance or additional access is needed to complete the inspection before relying on a statement that the drainage is satisfactory.
Follow the chamber references and direction
A plan commonly labels chambers and connections so individual camera runs can be traced. Read the start and finish references alongside the inspection direction. A distance recorded from one access point cannot be transferred to the opposite end without accounting for the surveyed route.
Measurements along the camera cable describe distance along the pipe, not necessarily the precise surface location or depth. Where a repair would require digging, ask whether the defect has been located at ground level. This prevents a report's chainage being mistaken for a ready-to-excavate position.
Separate observations from their consequences
Cracks describe visible damage to the wall. Displaced joints describe movement between adjoining sections. Roots indicate growth entering the pipe, while deposits describe a restriction. Each observation matters in context: a small deposit in a freely flowing run differs from extensive material holding back wastewater.
An image can show that a joint is open, but it may not establish exactly how much water escapes under different conditions. Visible roots do not identify the tree owner or prove responsibility for a repair. Ask which conclusions come directly from footage and which need further investigation.
Understand the grading system being used
WRc's current description of approved CCTV reporting software distinguishes internal structural condition from operational condition. Where its Sewer Risk Management grading applies, both use a scale of 1 to 5, with 5 representing the worst condition. Check the legend: some domestic reports use a different presentation. Source: WRc, Drainify assessment.
These numbers are condition classifications, not a percentage likelihood of failure or a countdown to collapse. A high grade needs an explanation of the defect, its extent and the recommended response. Ask whether a quoted grade belongs to a single observation, a pipe section or the survey's overall summary.
Why evidence should drive the recommendation
Thames Water's 2026 Pollution Incident Reduction Plan reports that its monitoring network helped identify and clear more than 4,500 blockages during 2025. That is a public-sewer operational figure, not a domestic survey success rate. It illustrates the value of evidence before choosing an intervention. Source: Thames Water, 2026 plan.
For your report, follow the same principle at a smaller scale. A recommendation to jet, patch, line or excavate should point back to a recorded location and explain why that method suits the defect. A vague instruction to replace the drains is difficult to assess without that link.
Turn the findings into a usable work list
Ask the contractor to distinguish immediate action, planned repair and monitoring. Obtain a quotation that identifies the pipe section, repair length, access needs and completion checks. Check whether clearance, disposal, junction reopening and surface reinstatement are included where relevant.
Keep the report, original video and completion footage together. If you seek another quotation, share the same evidence and scope so you compare like with like. A second contractor should not have to guess what an unexplained code or a cropped photograph was intended to show.
Summary
A useful report connects the pipe map, recorded observations and recommended action. If you need help investigating drainage in Manchester, ask Clenston Ltd about a CCTV survey and the information supplied with it.
