Party Wall Act Guide for Self-Builders

What is the Party Wall Act?

The Party Wall etc. Act 1996 is a piece of legislation that provides a framework for preventing and resolving disputes in relation to party walls, boundary walls, and excavations near neighbouring buildings. It applies in England and Wales. Scotland has different legislation.

The Act does not stop you from carrying out the work - it regulates how it is done and gives neighbours rights they would not otherwise have under planning or Building Regulations law.

When does it apply to a self-build?

The Act applies if your proposed works include any of the following:

• Building on or at the boundary: Constructing a new wall on the line of junction between your land and a neighbour's (even if the wall will stand entirely on your land)
• Excavation near a neighbour's building: Any excavation within 3 metres of a neighbouring structure if the bottom of the excavation will be lower than the bottom of the neighbour's foundations - or within 6 metres if a line drawn at 45 degrees from the bottom of the excavation would intersect the neighbour's foundations
• Works to an existing party wall or party fence wall: Less common on new builds, but relevant if you are building adjacent to or on a shared boundary wall

For most self-builds on a residential plot, the most common trigger is excavation for foundations close to a boundary. Even if the foundations appear modest, they may still trigger the Act. If in doubt, get advice from a party wall surveyor.

What notice do you need to serve?

There are three types of notice:

• Party Structure Notice: For works to an existing party wall or party fence wall. Must be served at least two months before work starts.
• Line of Junction Notice: For building on or at the boundary. Must be served at least one month before work starts.
• Three Metre/Six Metre Notice: For excavation near a neighbouring building. Must be served at least one month before work starts.

Notices must be in writing, served on every affected adjoining owner (not just occupiers). If a property is rented, notice must be served on the landlord as well as the tenant.

What happens after you serve notice?

Once served, the adjoining owner has 14 days to respond. They can:

• Consent in writing: The works can proceed without a surveyor. Keep the consent letter safely.
• Dissent (disagree): A party wall award must be drawn up by surveyors before work can start. Each party appoints their own surveyor (or they can agree on a single agreed surveyor). The surveyors produce a Party Wall Award - a legal document setting out what works can be done, when, and how.
• Fail to respond within 14 days: This counts as dissent. The surveyor appointment process begins automatically.

Costs

You, as the building owner, pay the costs of the party wall process. This includes your own surveyor's fees and your neighbour's surveyor's fees. A party wall award for a straightforward case typically costs £800-2,000 in surveyor's fees. More complex cases - multiple neighbours, complicated works - can cost significantly more.

Factor party wall costs into your project budget from the start. They are not optional and cannot be avoided if the Act applies.

What does a Party Wall Award contain?

The Party Wall Award (formally called an "Award") is a legally binding document that sets out:

• The works that are permitted and the conditions under which they may be carried out
• A schedule of condition of the neighbouring property (documenting its current state before works begin)
• Access rights for surveyors during construction
• Compensation provisions if damage occurs
• The right to carry out the works (removing any doubt about your legal position)

Scotland and Northern Ireland

The Party Wall etc. Act 1996 applies in England and Wales only. Scotland has different common law provisions relating to common walls and mutual boundary structures, but no equivalent statutory framework. Northern Ireland has its own Access to Neighbouring Land Act provisions. If your project is in Scotland or Northern Ireland, take specific legal advice.

Common mistakes to avoid

• Not serving notice at all. If the Act applies and you proceed without serving notice, your neighbour can seek an injunction to halt the works. This is an expensive and embarrassing situation that causes significant delay.
• Serving notice too late. The minimum notice periods (one and two months) are hard deadlines. If your programme is tight, serve notice early.
• Assuming the Act does not apply. Many self-builders on infill plots assume their foundations will not trigger the 3-metre rule. Get a surveyor to check before assuming.
• Appointing an unqualified surveyor. Party wall surveyors should be members of the Faculty of Party Wall Surveyors (FPWS) or have equivalent professional qualifications. Check before appointing.