Mending a drain without lifting the flagstones

27 October 2026

Some of the drains under older houses and yards on this coast lie beneath things nobody wants disturbed. A courtyard of old stone flags, a cobbled lane shared with neighbours, a walled garden that took decades to grow, a kitchen extension built straight across the line of the original pipe. When one of those drains cracks or lets in roots, digging it up means taking all of that apart as well.

A new pipe inside the old one

Relining puts a new pipe inside the old one. Once the drain has been cleaned, a flexible liner soaked in resin is pulled or inverted into the damaged length, pressed against the old pipe wall and left to cure until it sets hard. The result is a continuous lining with no joints for roots to find, installed from the existing chambers. A patch repair does the same over a short distance, sealing one crack or a leaking joint where the rest of the pipe is sound.

When it is the wrong answer

Relining is a good repair, but it cannot fix everything. A pipe that has collapsed, or one so displaced at a joint that a liner cannot pass, may need excavating. A drain that has sunk into a dip holds water, and lining it only preserves the dip. Old pipes laid with too little fall will still run slowly afterwards. These things are settled by looking: a camera survey before any repair is agreed, and another afterwards to show what was done.

Drain Relining sets out that approach well, explaining drain relining and patch repairs alongside CCTV surveys and excavation, with the method chosen from the condition of the pipe and the limits of the repair made clear beforehand.

Old pipes, cold weather

An older drain may be clay or cast iron, and its layout may have changed as the property was extended. Before lining, the run needs checking for bends, changes in diameter and connections along its length. Any branches affected by a liner also need to be identified in the repair plan.

Access matters as much as the pipe itself. A chamber hidden beneath garden soil may have to be found before a survey or repair can proceed. In a narrow lane, even getting a van near the working area takes thought. Around older properties, finding a route for the equipment without disturbing gates, steps or garden walls is part of planning the job.

Leaving things as they were

The quiet virtue of relining is what you do not see afterwards. Where the drain is suitable and access permits, the flags and nearby walls may be left undisturbed, with less work needed in the lane. For an old property where the surroundings are a large part of its charm and its value, that counts for a great deal. Digging still has its place, but it should be the answer the survey points to, not the only one anyone thought to offer.