Reposted here : Possible damp

[leakingroof]

Note: Been told to repost this here

We just moved into a new mid terraced property and have noticed some stains on the lower part of the inner walls that feel cold to the touch. One is by the front door and the other is by the back door. The house hasnt been lived in for a while and the heating hasn't been on either. We have noticed that the stain started to rise over the course of a week or two.

We borrowed a decent dehumidifier of the parents and the stains started to fade away. Here are some photos of it.

This is the patch by the front wall, i have outlined the patch as my camera is pants.

Here is a image to show the proximity to the front door

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Here is the patch by the back door, again i have outlined the patch due to poor camera

And here is a picture to show its proximity to back door

Are these problems due to the house not being lived in/had the heating on? Or do you think we have underlying problems here?

Many thanks