Damp patch in bathroom - Builder or roofer?

IntotheAbyss

Jeepers_Creepers said:

That does look like water penetration to me, as opposed to condensation; it's just too sharply defined and actually looks proper wet in the very corner. That amount of damp from condensation would usually be accompanied by mould, and be spread along the wall/ceiling edges more, I think.

Can't see any obvious cause from the outside - the tiles look fine. Hopefully it's down to a blocked gutter that's overflowing, as suggested before. 

When you get your longer ladder and a nice bright torch, please report back on what you find up there! Hopefully you can get close enough to that corner in the loft to see signs of water coming in. 

Chances are it'll be a simple fix - there just doesn't seem to be anything particularly amiss or in poor order outside. 

Thank you. I agree, water ingress seems most likely. The house we rented before buying this one had serious issues with a leaking roof, which resulted in a bad wet patch in the master bedroom and brown stains on the ceiling in the spare bedroom. This patch reminded me of that, although not as bad. I did hope it might have just been condensation though...

My dad is coming over this weekend to help us with fitting some blinds, etc. I will check if he actually has a longer ladder as he didn't text back after asking the length of ours. I will definitely post back once we've had a proper look in that corner.

It's raining today, rather lightly, but I will look at the guttering and hopefully something will be obvious. Will probably need some heavy rain though.

ETA: The rain is heavier than I thought, but looking at the guttering, I can't see any signs of a blockage. I will look again later today and see if it's any different.