What the insurer is actually assessing
Not "is there a leak". Four things, in this order, and each one is a separate argument.
- Is this an insured peril? Water escaping from a pipe, tank, fixed installation or domestic appliance is escape of water. Water coming in through a roof, a wall or rising from below is not, even though the floor looks the same.
- Is the damage excluded as gradual? Most wordings exclude damage from a gradually operating cause.
- Is the item that failed excluded? Pipes and fittings that failed through wear and tear are usually outside cover even when the damage is inside it.
- Which limits and excesses apply? Buildings, contents, trace and access, and the escape of water excess are four separate numbers.
Sudden versus gradual, and why the exclusion is not the end of it
The gradual damage exclusion, sometimes drafted as a gradually operating cause clause, is the most-used reason for declining a leak claim. It is also the one most often overturned.
The Financial Ombudsman Service publishes its approach. It is likely to tell an insurer to pay where three things hold together: the damage was caused by an insured event covered under the policy, such as escape of water; you could not reasonably have been aware of the damage happening gradually; and you claimed, or took reasonable action, as soon as you could reasonably have known.
The second limb is the one that decides most leak cases, and it is a question about knowledge, not about duration. A pipe can leak for eight months and still be paid if it was concealed. A pipe can leak for three weeks and be refused if you were told about it and did nothing.
A published ombudsman case study runs exactly that way. A homeowner found a ceiling stain caused by a slow leak from a waste pipe in the shower room above. The insurer relied on a gradual damage exclusion. The ombudsman upheld the complaint: photographs taken on the day of the claim showed a fresh stain with no mould or darker staining that would indicate long exposure, the leak was beneath the shower room floor and so could not reasonably have been found earlier, and the damage was reported promptly once noticed.
Read the finding on the evidence rather than the sympathy. The claim was won by a dated photograph and a plausible account of concealment.
Escape of water, ingress, and the third category
A wet floor is not a diagnosis, and the peril decides the claim.
| Where the water came from | Section likely engaged | Common sticking point |
|---|---|---|
| Split or pinholed supply or heating pipe | Escape of water | Wear and tear on the pipe itself |
| Waste pipe from a bath, shower or washing machine | Escape of water | Whether the failure was the pipe or the seal |
| Failed sealant or grout around a bath or shower | Usually none | Treated as maintenance, not escape |
| Rain through a roof, window or render | Storm, if the storm definition is met | Pre-existing disrepair |
| Water rising into a floor void from below | Flood, on some wordings | Whether it meets the policy’s flood definition |
That last row is not theoretical. In a published ombudsman case study, water accumulated gradually in the void beneath a floor, probably from a rising water table, and then came up through the floor into the living room. The service concluded the gradual build-up of water constituted a flood on that wording, which did not define the term, and told the insurer to pay. The lesson is that the label matters and the label is contestable.