What Is a Party Wall? — Party Wall Act Explained

Definition

A party wall is a wall that stands on the land of two or more owners and forms part of a building. This includes walls that separate adjoining terraced or semi-detached houses, and garden walls built on the boundary line. The Party Wall etc. Act 1996 provides a framework for preventing and resolving disputes in relation to party walls, boundary walls, and excavations near neighbouring buildings in England and Wales.

When Is It Used?

The Party Wall Act is triggered by three types of work: building on the boundary (Section 1), work to an existing party wall or party structure such as cutting in a beam, raising the wall, or underpinning (Section 2), and excavation within 3 or 6 metres of an adjoining owner's foundations (Section 6). Common domestic projects that trigger the Act include loft conversions with work to the party wall, rear extensions near the boundary, and basement excavations.

Key Facts

• The Party Wall etc. Act 1996 applies in England and Wales only (Scotland has different rules)
• Three types of notice: Line of Junction (Section 1), Party Structure (Section 2), and Adjacent Excavation (Section 6)
• Neighbours have 14 days to respond to a notice with consent or dissent
• A Schedule of Condition records the state of the neighbour's property before work begins
• The building owner is responsible for making good any damage caused by the work
• The building owner pays all reasonable surveyor fees, including the adjoining owner's surveyor
• A Party Wall Award is legally binding and can be enforced through the county court
• Work can proceed once the Award is served, even if the adjoining owner disagrees (they can appeal within 14 days)

Related Calculators

Use the Foundation Calculator for excavation depth planning, or the Brick Calculator for party wall construction. The Project Cost Calculator helps budget for party wall surveyor fees.