Are drain repairs covered by buildings insurance? A claims guide

Most UK buildings insurance policies cover damage to underground pipes and drains that you are legally responsible for — but only when the cause is sudden and accidental. A drain crushed by a delivery lorry, cracked by subsidence, or fractured by a tree root forcing its way through a joint is usually a valid claim.

What is almost never covered is gradual deterioration: a Victorian clay pipe that has slowly sagged, joints that have opened up over forty years, or a blockage caused by fat and wet wipes. Insurers class those as wear and tear or lack of maintenance, and every standard policy excludes them.

Since October 2011, the sewerage company owns most shared drains and lateral drains that run beyond your property boundary. If the damaged section is out in the road or serves more than one property, it is likely the water company's problem, not yours, and there is nothing to claim for — you just report it.

The pipework you own is the section inside your boundary serving only your property. That is the part your buildings insurance covers. A CCTV survey establishes exactly where the damage sits relative to the boundary, which is the first thing an insurer will ask.

A claim without evidence gets declined. A CCTV drain survey produces the three things a loss adjuster needs: recorded footage of the defect, a measured distance from a known chamber so the fault can be located and re-inspected, and an engineer's written report classifying the defect using standard drainage coding.

That report is what turns 'my drain is broken' into 'there is a Grade 4 fracture 6.2 metres from the rear chamber, consistent with root ingress at a displaced joint'. The second version gets paid.

Keep the raw footage. If an insurer instructs their own contractor and the findings differ, your independent survey is the only thing that lets you challenge it.

Clearing a blockage is a maintenance cost and you will pay for it yourself. However, if that blockage caused sewage to back up into the house, the resulting damage to floors, plaster and contents is frequently covered under the escape of water or accidental damage sections of the policy.

So separate the two costs. Bill the clearance yourself, and claim for the damage it caused. Photograph everything before anyone cleans up.

Many people have home emergency cover bolted on to their policy or bundled with a bank account. This typically pays for an emergency call-out to make the situation safe, up to a modest limit, and often includes drain clearance where the main policy does not.

It rarely pays for the permanent repair. Use it to stop the flooding, then run the repair through the main buildings policy if the cause qualifies.

First, stop the damage — turn off water to the affected fixture, move contents, and get an engineer out. Insurers expect you to mitigate; leaving sewage in a kitchen for a week to 'preserve evidence' will be held against you.

Second, photograph and video everything before clean-up. Third, get an independent CCTV survey and written report. Fourth, notify your insurer with the report attached and ask them to confirm in writing whether the cause falls inside or outside the policy. Fifth, get a written repair quote — patch lining, full relining or excavation — so the insurer is pricing a defined scope, not an open-ended job.

If the claim is declined on wear-and-tear grounds but your survey shows root ingress or third-party damage, that is a decision worth challenging, in writing, referencing the coded defect.

We carry out CCTV drain surveys with insurer-format written reports across London and a 25-mile radius of East Grinstead, 24 hours a day. If the damage turns out to be the water company's responsibility, we will tell you that rather than sell you a repair.

Call 0330 1331 347 and we will get an engineer and a camera to you.