Start with where the water first appears
When you notice a leak around a roof window or skylight, it helps to separate what you can see from what may be happening underneath. The issue here is water appearing at the frame or lining of a roof window. With a leak around a roof window or skylight, a small visible defect can sometimes have a simple explanation, while a wider pattern may point to something that needs a closer inspection.
Before arranging work, note whether water starts at the top, side or bottom of the internal frame, whether the leak happens only in wind-driven rain, and whether condensation is forming on the glass or frame in dry weather. For a leak around a roof window or skylight, this sort of simple information often tells more than a close-up picture because it shows when and where the defect is active.
Roof-window leaks have a few common causes
The main possibilities are damaged or incorrectly fitted flashing around the roof window, blocked drainage channels in the window flashing system, and broken tiles or slates beside the opening.
Other causes worth considering are failed seals or frame components, and condensation running down the inside and being mistaken for a roof leak. With a leak around a roof window or skylight, the important thing is to match the cause to water appearing at the frame or lining of a roof window, rather than treating it as a general roofing fault. For a leak around a roof window or skylight, that distinction can prevent work being carried out on a nearby detail that happens to look worn but is not responsible for what you are seeing.
Rule out ordinary condensation
From a safe position, you can dry the frame and note exactly where new moisture first appears. You can also check whether the surrounding roof covering looks disturbed from outside at ground level.
It is also useful to clear visible internal condensation and see whether the problem still follows rain. For a leak around a roof window or skylight, write down what you can see and, where relevant, what the weather was doing at the time. When checking a leak around a roof window or skylight, avoid walking on the roof or leaning out of windows; the aim is to collect useful information without creating another problem.
When the leak can damage the opening
This becomes more urgent if water is reaching electrical blinds or nearby wiring, the lining is becoming soft or swollen, and the external flashing looks loose after a storm. With a leak around a roof window or skylight, those signs suggest that waiting for a convenient time could allow more water entry, falling material or further damage.
If those warning signs are absent, a leak around a roof window or skylight may not need an emergency call-out, but it is still worth arranging a proper look before the condition gets worse. In this case, change over time matters: water appearing at the frame or lining of a roof window that has been stable for a long period is a different situation from something that has appeared recently or is becoming more obvious after each spell of bad weather.
What needs checking around the whole frame
A roofer looking at a leak around a roof window or skylight should check the complete flashing kit around the window, then inspect tiles or slates immediately above and alongside the opening.
They may also need to separate a roof-detail fault from a window-unit or condensation problem. Because this page is about a leak around a roof window or skylight, the inspection should stay focused on that problem and the nearby details that could realistically produce it. For a leak around a roof window or skylight, ask what they think has failed, what evidence supports that view, and whether the proposed work is local or part of a wider defect. A clear explanation of a leak around a roof window or skylight is more useful than a quotation that simply lists materials.
The repair depends on which layer has failed
Depending on what is found, a suitable repair might refit or replace the correct flashing components, repair nearby coverings that are directing water into the opening, or deal with ventilation and condensation if the external installation is sound.
For a leak around a roof window or skylight, the best option is the one that deals with water appearing at the frame or lining of a roof window and leaves the surrounding roof working as it should. If wider work is proposed for a leak around a roof window or skylight, ask why a local repair would not be reliable, what condition the adjoining materials are in, and whether access costs make it sensible to combine closely related repairs. The answer should make sense for a leak around a roof window or skylight, not read like a standard reroofing recommendation.
This guide is general information about a leak around a roof window or skylight. The cause of a leak around a roof window or skylight at an individual property can only be confirmed by inspecting the relevant roof area.