The short answer
A roof leak left unfixed rarely stays the same size. Damp spreads into the timbers, the insulation and the plaster below, and the repair that would have been small grows into a larger one. Insurers also expect you to act promptly, and the Financial Ombudsman treats a known, long-running fault very differently from sudden storm damage.
Damage that grows out of sight
The visible sign of a leak, a brown stain or a damp patch, is the last stage of a process that started higher up. Rainwater gets through a defect in the covering, runs along the underlay, soaks the rafters and the strips of timber under the tiles, and only then reaches the ceiling. By the time you see it, the wet has travelled.
Left alone, each wetting does a little more. Timber that stays damp can soften and rot. Insulation laid between the joists holds water like a sponge and loses its value, so the house gets colder as well as wetter. Plaster blisters and falls, and a ceiling that has soaked for long enough can become heavy and unsafe.
Damp air also feeds mould, which can reach walls, wardrobes and bedding well away from the leak. Metal fixings rust, and in a loft that carries electrics, water sitting near cables is a hazard of its own.
None of this is hurried, which is the trouble. A leak that drips only in heavy rain can go on for a whole winter without alarming anyone, while the structure behind it takes the strain. Our guide to finding a roof leak explains how the source is traced.
What insurers expect
Home insurance policies commonly expect the owner to take reasonable steps to limit further damage once a problem is known. That is a general principle, and your own policy wording is what counts, so read it rather than assume.
The Financial Ombudsman sets out how it weighs a refused roof claim. Did a storm really happen? Does the damage fit that explanation? Did the weather create the fault, or only reveal it? A complaint is poorly placed when the roof had been failing beforehand and the owner was aware, and the ombudsman notes that insurers commonly rule out damage that built up slowly, along with ordinary ageing.
The message for a leak is plain. If you know about a defect and let it run, a later claim becomes harder, because a gradual fault looks like neglect. If a storm did cause the damage, ring the insurer before anything else, protect the house and hold on to your photographs and receipts.
No roofer or website can tell you what an insurer will pay. Early action does at least leave you with evidence to put forward.
Making safe, then repairing properly
The first job with a leak is to stop it getting worse, and that is a different task from the permanent repair. A make-safe might be a temporary covering, a patch over a missing tile or the clearing of a blocked outlet. It buys time without solving the cause.
Inside the house, protect what you can. Catch drips in a container and shift furniture and electrical items clear of the area. Where water reaches a light fitting or wiring, turn the power off at the consumer unit and call an electrician before anything else. Our answer on a roof leak near a light fitting covers that case.
Stay off the roof yourself. Wet slopes are slippery, and a fall does more harm than any leak. A few photos taken outside at ground level and up in the loft give a roofer plenty to start with.
With the water stopped, the next step is a survey that finds the cause rather than the symptom. We photograph the defect, explain it in plain words and set out the repair as one written price.
How long is too long to wait
There is no safe number of weeks, and any figure you read online is a guess. The better question is what the leak is doing at the moment. A drip into a bucket every few minutes after a storm needs prompt attention. A faint stain that has not changed may be older and slower, but it still needs a cause found.
Signs that a leak should not wait include a stain that grows or darkens, a ceiling that bulges or sags, water running down a wall, a musty smell in the loft and dripping near electrics. Any of those justify a call to a roofer, and a drip near electrics calls for an electrician first.
It also helps to know your own roof. A leak that appears at the same spot every time suggests a defect in one place, such as a flashing or a valley, and is often a small repair if caught early. Our roof repairs page explains how repairs are matched to how the roof was built.
If you are unsure how urgent it is, send us your photographs and a short description. We will say whether it needs a make-safe now or a survey when it suits, and either way you receive one written price after the survey.
