I have just purchased a house and there appears to be mold (which was well hidden on viewings) in a couple of places which both seem to be caused by walls in the garden. In one case the shared wall with the other semi has a small gap of a couple centimeters between it and the house. A small amount of rubbish and snails have got in there but you can see the white painted render has a greenness to it, the same colour as the mould inside. The other wall on the other side of the house is attached and there is some evidence of mould in a kitchen cupboard on the inside of the wall - I haven't investigated further.
I am not sure what options I have beyond just knocking the walls down?
I am not sure what options I have beyond just knocking the walls down?