Just noticed this brown stain above my living room window. I don’t have a ladder at the moment so can’t reach it to touch it but the wallpaper near it is starting to lift so I think it might be damp. But it’s on the ground floor and there doesn’t appear to be anything else around it or in the room above it. My bathroom is on the floor above too but to the right. Could it be water travelling from the bathroom down or getting in from outside? It hasn’t rained locally since Saturday.
There is a bathroom above. Not directly but the shower is slightly to the right and I’ve just found a section of seal around the shower that’s lifted.
My guess is that it’s the bathroom is the source. That said, any good contractor will know that you need to cut the ceiling drywall away to find the exact source and not create a wet space that will grow black mold.