The Party Wall Act 1996 is designed to help prevent and, should they occur, resolve disputes in relation to party walls, boundary walls and excavations near neighbouring buildings. The key is to if the planned work might affect the structural strength and support of a party wall, or cause damage to the adjoining owner’s side of the wall. It’s an important issue that is well regulated and compliance is essential.
Apart from the obvious construction and demolittion of buildings or parts of buildings sited on party walls, other matters that fall under the Act include such things as – removing a chimney breast from a party wall and digging below the foundation of a neighbour’s property.
If you are in doubt about whether your planned work requires a notice you might wish to seek advice from a qualified surveyor who is experienced in party wall work.
For further information, the government issue an explanatory leaflet which you can read online. This gives good background to the main principles, though best to discuss your circumstances with a professional. The leaflet can be found as below.