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If you live in a semi-detached or terraced house in the UK, your project is likely governed by the Party Wall etc. Act 1996. However, it is a common misconception that this only applies to attached properties. Even if you live in a detached house or a flat, the Act may still apply to your project. Ignoring this can lead to legal injunctions that stop a build in its tracks.

What is a Party Wall?

It is the shared wall between you and your neighbour (or the floor/ceiling between flats). It also covers garden walls built on the boundary line (Party Fence Walls).

When Do You Need an Agreement?

You must serve notice to your neighbour if you plan to:

• Cut into a wall: e.g., to insert the end of a steel beam for a loft or extension.
• Remove a chimney breast: Even if it’s on your side, it affects the shared structure.
• Excavate near their foundation (The 3 & 6 Metre Rules):
  • The 3 Metre Rule: If you are digging within 3 metres of their building and going deeper than the bottom of their foundations.
  • The 6 Metre Rule: If you are digging within 6 metres and your excavation cuts a 45-degree line downwards from the bottom of their foundations (this typically applies to deep basements or trench foundations).

The Engineer’s Role

While Party Wall Surveyors handle the legal agreement (the “Award”), a Structural Engineer provides the technical details of the permanent works. Engineers provide the structural calculations and drawings that demonstrate how the new extension or loft will be supported. This information is vital for the Surveyor to assess the risk to the shared wall and ensure the correct details are included in the legal agreement.