Recording where a drain was relined, and why it matters

15 October 2026

A relined drain looks exactly the same from the surface as one that has never been touched. The chamber covers are where they were, the yard is unchanged, and before long nobody on site remembers which run was repaired. That is fine until someone wants to connect into the drain, jet it hard, or sell the property.

The repair is only as good as its record

Relining adds a lining inside the existing pipe. A future contractor needs to know which run was lined, between which chambers, and whether branch connections were reopened. Without that information, later work may overlook the repair.

The useful record for each repair covers:

• the survey footage and report that identified the defect
• the repair chosen, whether a local patch, a longer liner or excavation
• the position of the repair, measured from a named chamber
• post-repair footage showing the finished section and reopened connections
• any testing carried out, reported as its own document

Why the method needs explaining in writing

Relining is not right for every drain. Drain Relining covers relining, patch repairs and excavation, with the method chosen from the condition of the pipe. The reason for that choice belongs in the file. If a section was left alone because the fall was poor, or because excavation was recommended instead, the record should say so. Otherwise the next owner may assume the whole run was dealt with.

Where the record should live

For a home, the drainage folder sits with the deeds and the other certificates. For a depot, a managed estate or a row of commercial units, it belongs in whatever asset register the business already keeps, filed against the building or yard rather than the contractor's name. Contractors change; the drains stay. If the property is let, the landlord and the managing agent should both hold a copy.

We see the same pattern with websites. The firms that recover quickly from a fault are the ones that kept a short note of what was changed and why. A drain is no different. Store the files in a backed-up shared location, keep the original videos rather than compressed copies, and add a line to the site plan marking the lined section. Give the files names that identify the building, the chamber and the date of the repair. A folder called “drains” is not much use when it contains years of unrelated reports. When someone asks about that run later, the documents can be found without hunting through old email threads.