After a drain repair: what completion evidence should you keep?

DASA describes repair choices ranging from clearance to work on damaged pipe sections. That variety is a reason to ask what evidence suits your actual job, rather than assuming every repair comes with the same completion package. Ask the contractor to put the deliverables in the quotation before work begins.

Make a small schedule: original concern, pipe-section reference, agreed work, completion evidence and recipient. If a surveyor, insurer or sewerage company needs to review the outcome, obtain its requirements first. The questions here help you organise the handover; they are not a technical acceptance standard or an instruction to withhold an agreed payment.

Sources: DASA; Thames Water.

Ask for consistent chamber or pipe identifiers across the original report, quotation and completion record. If the layout or labels changed, request a simple explanation or updated drawing. A video labelled only with the property name can leave you unsure which part of the work it shows.

For each repaired section, ask the contractor to identify the relevant recording and explain what is visible. Check the date and whether the footage covers the agreed length. If another section remains uninspected, keep that limitation explicit. The aim is to trace the evidence, not to judge installation quality yourself from a brief clip or a still image.

• Which original defect does this record relate to?
• Where does the inspected section begin and end?
• What work was completed at that location?
• Was any part of the agreed inspection incomplete?

Sources: DASA; DASA.

Approved Document H for England distinguishes testing from inspection. Our practical reading is that a post-work video should not be described as a completed air or water test unless that separate test was actually undertaken and recorded. Ask the person requesting the evidence which method is required.

Similarly, ask for any guarantee in writing rather than treating the recording as the guarantee. Check who issued it, which work it describes, what conditions apply and how a concern should be reported. Do not infer a lifespan or protection against every future blockage from a statement that the surveyed section looked clear on the day.

Sources: Approved Document H; DASA.

For example, Thames Water describes a post-construction survey stage for its class 2 build-over applications. This is a particular approval process, not a requirement for every domestic repair. It illustrates why a contractor finishing a job and the relevant recipient accepting the evidence can be different events.

If your work has a consent, insurer instruction or other written requirement, check who must receive the final documents and who confirms acceptance. Keep the submission and response with the repair file. For work without such a requirement, agree the handover directly with your contractor rather than inventing an approval that is not needed.

Sources: Thames Water.

Compare the delivered file against the agreed schedule. If a recording, drawing or result is absent, ask whether it was omitted from the email, not included in the price or not completed. Those are different situations. Request a written explanation and next step rather than silently treating missing evidence as either a failed repair or proof that everything is satisfactory.

Keep the original report, agreed quotation, changes approved during the work, completion record, invoice and guarantee together. Check that the files open and that you have a usable copy of any promised recording. If symptoms recur, provide the previous section references and dates. Do not attempt chamber entry or equipment checks yourself to fill a documentation gap.

Sources: DASA; HSE.

• Does the completed work match the agreed section and scope?
• Can the before-and-after records be matched without guessing?
• Are recordings and written findings included as promised?
• Are any separate test results clearly identified?
• Have omitted sections and unresolved concerns been explained?
• Are guarantee terms and the correct contact supplied?
• Has any required recipient confirmed receipt or acceptance?

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