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Thanks very much. The wall is not a new wall, but they have put new concrete over the pipes from the sink, which were put under the floor. I'll show this to our builders, there could be a leak under there without us knowing.

Sorry to be confusing. It's a downstairs toilet (room) that contains a sink and toilet. The wall with the blue circle is the other side of the wall with the damp circles. The toilet is opposite and sink is on the back wall, as shown.

Yes it is concrete.

This is the wall the other side

We had this internal wall plastered several months ago. The wall is between our kitchen, which is being renovated, and a new bathroom under the stairs. Pipes have been laid under the bathroom floor for the sink and toilet. The first circle and blob appeared shortly after the pipes were laid...