What is the Party Wall Act?

If you’re planning an extension, loft conversion, basement excavation, or chimney breast removal, you may need to comply with the Party Wall etc. Act 1996. The Act provides a legal framework designed to prevent and resolve disputes between neighbours when building works affect shared walls, boundaries, or nearby structures.

This guide explains what the Act covers, when it applies, and what to do if a dispute arises.

Overview of the Party Wall Act

The Party Wall Act applies in England and Wales (not Scotland or Northern Ireland). It ensures that property owners carry out certain types of work fairly and with notice to their neighbours.

In simple terms:
If you plan to carry out work on or near a wall or structure shared with your neighbour, you must serve notice before starting.

What Is a Party Wall?

A party wall is a wall or structure that separates two properties. Common examples include:

The dividing wall of a semi-detached or terraced house
A wall that forms part of one building but acts as the boundary with another property
A garden wall that separates two gardens
The floors and ceilings between flats or maisonettes

The Act also covers excavations close to neighbouring structures — for example, foundations for an extension or basement.

Works That Fall Under the Act

Building works that usually require notice under the Party Wall Act include:

Demolishing or rebuilding a shared wall
Altering the height, thickness, or structural integrity of a party wall
Removing chimney breasts attached to a party wall
Excavating within 3 metres of a neighbour’s foundations (if deeper than theirs)
Excavating within 6 metres if your works cut beneath their foundations at a 45° line
Underpinning foundations
Inserting damp-proof courses or insulation into a shared wall

Works that do not require notice: minor works such as plastering, rewiring, or putting up shelves.

Serving Notice Under the Party Wall Act

If your project falls under the Act, you must serve a Party Wall Notice to all affected neighbours.

A valid notice includes:

The names of the property owners carrying out the work
The address of the property where work will be done
A description of the proposed works
The names of adjoining owners affected
The proposed start date
A statement that the notice is served under the Party Wall etc. Act 1996

Notices must usually be served one or two months before works begin, depending on the type of work.

Responses to a Party Wall Notice

Neighbours (Adjoining Owners) have 14 days to respond:

Consent: The neighbour agrees, and works may proceed. A Schedule of Condition is recommended to protect both parties.
Dissent: The neighbour does not agree. Both parties must appoint surveyors (or agree to one surveyor acting for both) to prepare a Party Wall Award.
No response: This is treated as dissent, and surveyors must be appointed.

What Happens in a Dispute?

When there is a dispute, surveyors are appointed to act impartially. They will prepare a Party Wall Award, which:

Details the works to be carried out
Sets out how and when the works will be done
May require additional protective measures
Records the condition of the adjoining property before works start
Allows surveyors access to check the works during construction

No work may begin until the Award has been served.

Can I Appeal a Party Wall Award?

Yes. If you disagree with the surveyor’s decision, you may appeal to the County Court within 14 days of receiving the Award. The court’s decision will be final.

How Long Is an Award Valid?

Works must commence within 12 months of serving notice. If the works are delayed beyond that, you will need to restart the process and serve fresh notices.

Why the Party Wall Act Matters

The Act protects both property owners by ensuring:

Neighbours are informed before potentially disruptive works begin
Building owners can progress lawfully with their projects
Disputes are resolved fairly and professionally
Adjoining owners have their property condition recorded and safeguarded

Without following the Act, building works can be stopped, and owners risk costly disputes.

Learn More

At Christopher Anthony Surveyors, we specialise in guiding homeowners and developers through the Party Wall process in North London and Hertfordshire.