You are reading a single comment by @moocher and its replies.
Click here to read the full conversation.
-
If it normally has a sofa in front, then @Howard 's condensation suggestion seems most likely - cold wall, sweaty room, no airflow, mouldy walls.
Otherwise, you'd need to be looking behind the skirting and plaster, below the floor, and under the gravel in front.
NotThamesWater
@moocher
Happy to lift some floorboards if you want to look underneath