I agree with everything said so far except getting a surveyor - with our help you can identify the cause yourself.
A couple of things:
The damp was only noticed when you moved the furniture. Clearly the wall in that location was not adequately ventilated. Not returning the furniture will likely help a lot in itself, but remember, even when any source of damp is removed it can take months for masonry / plaster to dry out.
Is it an exposed wall, i.e. does it get driving rain ? Is it a cavity wall wall ? Has anything changed in that area recently such as new paving, new neighbours, blocking up the fireplace ?
Go outside when its raining and take a good look - you might see water dripping off the roof, gutter or chimney.
|