Incomplete drain survey: what to ask before a return visit

Ask the contractor to mark the inspected and uninspected lengths on the same plan. The useful distinction is between a pipe they examined, one they reached but could not assess properly, and one they never reached. A report labelled incomplete may still contain important observations, but its conclusion needs to respect those boundaries.

A public drainage report published by Northaw and Cuffley Parish Council includes a survey stopped because the camera could not be pushed further. That is an example of a recorded inspection limit, not evidence that the same explanation applies at your property. Ask for the actual reason in your report, with a location and the relevant recording reference.

• Match each gap to a start point, direction and pipe reference.
• Ask whether the stopping distance is a camera distance or a confirmed position on the ground.

Sources: Northaw and Cuffley Parish Council.

Ask the operator to explain what they actually saw. Was the restriction visible, or was the camera simply unable to advance? Was the view obscured? Was an access point unavailable? These are questions for the operator, not a way to diagnose the drain from a short video or a photograph.

Request a separate explanation of the proposed remedy. If the suggestion is cleaning, different equipment or access from another point, ask which missing section that would address and what would still remain uncertain. Do not assume that another visit guarantees a complete survey. Ask what the operator will do if the same limitation remains.

Sources: Northaw and Cuffley Parish Council; United Utilities.

HSE identifies serious hazards in confined spaces, including dangerous atmospheres and drowning. Do not enter a drain or chamber to help a camera pass. Tell the contractor about access restrictions and leave the assessment of equipment, cover lifting and safe working arrangements to competent people.

Access may also involve someone else's property or a public sewer. United Utilities, for example, has a permission process for CCTV investigation on its public network. That process is specific to its area. Ask the relevant sewerage company and property owner what permission is needed rather than assuming that paying for a survey gives a contractor unrestricted access.

Sources: HSE; United Utilities.

Use the existing report to create a short list of unresolved questions. For each one, record the pipe reference, the proposed method and the output you need. Ask whether the new quotation includes preparation, the return inspection, an updated plan and a combined report that distinguishes the two visits.

Confirm any attendance charge, allowance, VAT treatment and additional-work approval process directly with the contractor. This guide does not quote a standard return-visit fee. If the original booking promised a particular scope, compare that wording with the delivered work and request a written explanation of any difference before accepting a new scope.

Sources: Northaw and Cuffley Parish Council; United Utilities.

If a surveyor, conveyancer or insurer requested the inspection, send the complete report and its limitations to them. Ask whether the missing section matters to their decision and what evidence they need next. A contractor's attendance note is not automatically the same thing as the report your adviser requested.

Keep the first recording and report when a revised version arrives. Ask for a clear link between old and new pipe references so that a later reader can follow the investigation. The aim is an intelligible record of coverage, not a reassuring label that hides the uninspected part.

Sources: Northaw and Cuffley Parish Council.

• Which lengths remain uninspected or only partly visible?
• What stopped the first inspection, and where is that recorded?
• What will be different on the next visit?
• Who will arrange access and any public-network permission?
• What is included in the return price and what needs separate approval?
• Will I receive one updated coverage plan with both visits identified?

Find and check a drainage contractor when you are ready to ask for quotes.