My neighbours commenced extensive building work in the summer. We mentioned the party wall act to them and they claimed non of the work was structural.
They have entirely removed and rebuilt one floor. Foundations have been dug for an extension within 3 metres of the party wall. To top it off I have found chunks of plaster falling off a section of the party wall. This is a section they were clearly working on last week judging by the noise.
What is my next step? Do I contact a surveyor, building control. I want to clarify my position before I confront them.