First decide whether it really is the roof
Water coming through a ceiling can look straightforward, but the visible sign does not always sit directly over the fault. On this page the important question is working out whether the source is the roof or something inside the house. For water coming through a ceiling, the position of the problem, the weather when it appears and whether it is changing are more useful than guessing from one photograph.
Pay particular attention to whether the water appears only when it rains, whether there is a bathroom, tank or pipework above the mark, and whether the wet patch is directly below the loft or below another room. Those observations are worth passing on because they describe how water coming through a ceiling behaves at your property, not just how it looks on one day.
Roof leaks are only one possible source
The main possibilities are rain entering through the roof covering, a leaking pipe or plumbing fitting, and a cold-water tank or overflow problem.
Other causes worth considering are condensation collecting in the roof space, and water travelling from a chimney or valley before reaching the ceiling. With water coming through a ceiling, the important thing is to match the cause to working out whether the source is the roof or something inside the house, rather than treating it as a general roofing fault. For water coming through a ceiling, 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.
Safe checks you can make indoors
From a safe position, you can turn off or avoid using nearby plumbing if the leak continues in dry weather. You can also look in the loft for wet insulation or a clear drip path.
It is also useful to note whether the stain changes immediately during rain or after a delay. For water coming through a ceiling, write down what you can see and, where relevant, what the weather was doing at the time. A short sequence of photographs of water coming through a ceiling from the same safe viewpoint can show whether the condition is changing. When checking water coming through a ceiling, avoid walking on the roof or leaning out of windows; the aim is to collect useful information without creating another problem.
When ceiling water is an emergency
This becomes more urgent if water is near a light fitting or electrical cable, the ceiling is sagging, soft or visibly swollen, and water is pouring in quickly. With water coming through a ceiling, 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, water coming through a ceiling 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: working out whether the source is the roof or something inside the house 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 a roof inspection should establish
A roofer looking at water coming through a ceiling should confirm that the moisture route actually leads to the external roof, then separate roof defects from plumbing or condensation.
They may also need to inspect the roof detail above and upslope from the wet area. Because this page is about water coming through a ceiling, the inspection should stay focused on that problem and the nearby details that could realistically produce it. For water coming through a ceiling, 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 water coming through a ceiling is more useful than a quotation that simply lists materials.
Stop the source before repairing the ceiling
Depending on what is found, a suitable repair might repair the roof only once it is clear that rain is the source, replace damaged plasterboard after the leak has been stopped and the area dried, or deal with plumbing or condensation separately if the roof is sound.
For water coming through a ceiling, the best option is the one that deals with working out whether the source is the roof or something inside the house and leaves the surrounding roof working as it should. If wider work is proposed for water coming through a ceiling, 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 water coming through a ceiling, not read like a standard reroofing recommendation.
This guide is general information about water coming through a ceiling. The cause of water coming through a ceiling at an individual property can only be confirmed by inspecting the relevant roof area.