Drainage and home insurance: what is usually covered and what is not
Sudden failure is often covered. Gradual deterioration usually is not. The wording decides, and the evidence decides how the wording is applied.
The distinction that decides most claims
Insurers separate sudden and unforeseen events from gradual deterioration. A drain that collapses is usually the first. A drain where roots have grown in slowly over fifteen years is usually the second, and most policies exclude wear and tear explicitly.
That is why two apparently similar defects get different answers, and why the survey report matters so much: it is the document that characterises which one you have.
What tends to be covered
- Escape of water damage inside the property, one of the most common household claims
- Sudden collapse of underground services, where the policy includes them
- Subsidence where a defective drain is identified as the cause, though this brings its own investigation
- Accidental damage to pipework, for example during building work, where that cover is held
What is rarely covered: the cost of clearing a blockage, general maintenance, and defects present when the policy started.
Subsidence claims and drains
Where subsidence is suspected, insurers routinely commission a drainage survey, because a leaking drain washing soil away is one of the common causes. This works both ways: it can support a claim, and it can also lead to the insurer requiring the drain to be repaired as part of the settlement.
If you are in this position, keep the drainage evidence separate and complete. It gets referred to repeatedly.
What insurers actually want to see
Footage of the run, the position and depth of each defect, a severity grading, and a written opinion on cause. Vague reports get queried, which delays settlement.
Say up front that the survey is for a claim, because it changes how the report is written rather than how the work is done. See what our surveys include.
Before you claim
- Check whether the fault is even on your pipework. If it sits beyond the boundary it may be the water company’s, and there is no claim to make. See who is responsible.
- Read the wording on underground services and gradual deterioration before commissioning anything.
- Get the survey done properly the first time. A second survey to answer questions the first one did not is money wasted.
- Keep the footage. Claims can run for months.
Landlords, leaseholders and who claims
In a block, the building is usually insured under a single policy held by the freeholder or the management company, so a leaseholder with a drainage escape often has no claim to make directly. The claim belongs to whoever holds the buildings policy, and the leaseholder’s own contents cover deals only with their belongings.
Landlords have the same split: buildings cover for the structure and the drainage, contents cover for anything furnished. Where a tenant’s misuse caused it, the claim and the recharge are two separate arguments, and both need the same evidence. See landlord drainage obligations and shared soil stacks.