Depending on the work you are doing, it is your responsibility as the building owner to serve one of these Party Wall Notices -  or you could use a surveyor appointed to act on your behalf:
A Party Structure Notice, involving work to an existing Party Wall or Party Structure.
A Line of Junction Notice 1: involving the construction of a new wall on the boundary line i.e. a shared wall.
A Line of Junction Notice 2: this is a new wall entirely on the building owner's land, adjacent to the boundary line i.e. belonging solely to the building owner.
Excavation works notice (either 3 or 6 metres): this affects excavation works to build new foundations for a wall or basement.
In our experience, we've seen that you might need multiple notices for the same project, depending on the extent, location and complexity of the work.