Party walls separate buildings owned by different owners, so if you live in a semi-detached or terraced house you would be sharing a wall or walls with your neighbours and this is called the party wall as it is used by both parties.
Definition of a Party Wall
The excavation of foundations within 6m of an adjoining structure and below a line drawn at 45 deg from the bottom of its foundations.
The Excavation of foundations within 3m of an adjoining structure which would be lower than its foundations.
The insertion of a beam into a shared wall.
The insertion of a damp proof course all the way through a shared wall.
The demolition and rebuilding of a party wall.
Underpinning any parts of the party wall.
The raising of the whole of the party wall including cutting off any object that may prevent this from happening.
Cutting a flashing into an adjoining building to protect adjoining walls.
The building of a new wall on the line of junction (boundary) between two properties.
…… and a number of other issues relating to building works near neighbouring properties of different owners.
The Act is basically a dispute resolution procedural process, for building works that occur beside neighbouring buildings and/or structures.
It is normal for the Building Owner who instigates the works to pay for all costs (expenses & fees) under the “ Act “.