Strange damp

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Hi, I’m new to this forum. Hoping someone can help or advise me on a very strange damp issue that we seem to have in our house. We have had one or two areas of damp on the dividing wall between kitchen and dining room for a while, I should mention this wall is also below the upstairs bathroom that we recently had made into a wet room. Damp seems to only have been apparent since bathroom has been done but not sure if this is coinsedence. No damp showing through roof/bathroom floor, or on other side of wall, (kitchen side. There is also a strange patch of damp on other side of door which I’m not sure is related. However, the strangest thing has happened today in the same room, I should mention also that we have had some heavy rain today! A load of damp has appeared on bottom half of wall in the same room, the wall that separates diner from stairs, underneath stairs is kitchen larder. I’ve attached pics and video so if anyone has the time to have a look, please do, and let me know if you have any suggestions. Hopefully I have explained myself well enough. Thanks in advance.
 

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I presume you've got a concrete floor?

the floor is wet, probably from a plumbing leak, and it's soaking up the wall.

Have you got a water meter?

Have you got any loft tanks? If so, go up and see if the are constantly running. Also observe where the pipes run down to the ground floor, and include them on your plan

Please draw a plan of the house. Include on it the wet wall, and the position of the outdoor stopcock or water meter, and the place where the kitchen sink used to be when the house was built. Most likely the underground pipe runs in a straight line between those two points. photographs of the indoor and outdoor stopcocks, and the pipes on them, may help.

How old is the house?
 
The damp above the doorway suggests that you have a leak from above!
How was the wet room tanked? What materials were used?
If you didn’t have this before and you’ve had a wet room installed upstairs then that’s a likely source of the problem.
 
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Brick wall? Outside wall...

Plasterboarded...? Could it possibly be the dabs soaking up a bit of moisture during recent heavy rains..?

Seems a bit too much of a coincidence re: new bathroom. - no guttering fallen or blocked..?
 
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