In this guide, we’re going to explain exactly what the Party Wall Act covers and when it applies.
We advise homeowners across London on this every week, and most problems arise because people misunderstand when the Act is triggered.
If you are planning building work or you have received a party wall notice, this will help you understand what happens next.
Let’s go through it clearly.
What Is the Party Wall Act?
The Party Wall etc. Act 1996 is a piece of legislation that applies in England and Wales and governs certain types of building work carried out on shared walls or near neighbouring structures.
The Act does not prevent development. Instead, it creates a formal process that protects both the person carrying out the work and the adjoining owner.
It sets out:
- When notice must be served
- How disputes are resolved
- How surveyors are appointed
- How loss and damage is handled
- What rights of access exist
If your works fall within its scope, you must follow the procedure before starting on site.
Who Is This Act Relevant To?
The Party Wall Act is relevant to two types of people.
- The building owner planning works
- The adjoining owner whose property may be affected
If you are planning construction works, the Act may require you to serve notice before starting.
If your neighbour is about to start work and you believe it affects a shared wall or nearby foundations, the Act may give you rights and protections.
Understanding which side you are on helps clarify what to do next.
What Does the Party Wall Act Cover?
The Act covers three main types of work.
1. Work to a Party Wall or other Party Structure
This includes:
- Cutting into a party wall
- Inserting steel beams into it
- Removing chimney breasts attached to it
- Raising or underpinning the wall
- Demolishing and rebuilding it
Loft conversions often fall into this category because they require steel beams to be inserted into the shared wall.
You can learn more about what a party wall is by checking out our guide.
2. Construction on the Line of Junction
If you plan to build a new wall on the boundary line between properties, the Act applies. This commonly arises with rear extensions where the new wall sits either up to or astride the boundary.
3. Excavation Near a Neighbouring Structure
The Act applies if you excavate within 3 metres of a neighbouring or shared structure and deeper than its foundations, or within 6 metres in certain deeper excavation scenarios.
This frequently affects basement projects and rear extensions.
Many homeowners are surprised that excavation alone can trigger the Act, even if no shared wall is touched.
Does the Party Wall Act Apply to My Project?
If you are planning a loft conversion, rear extension, basement excavation, or structural alterations to a shared wall, then there is a strong chance the Act applies.
The safest approach is to assess this before finalising your start date. If notice is required, there are minimum notice periods. Leaving it too late can delay your project.
If you’re unsure, take advice early. A quick review of your drawings can usually confirm whether the Act is applicable.
Work Requiring Notice
The general principle of the Party Wall etc. Act 1996 is that any work which might affect the structural strength or support function of the party wall, has the potential to damage the neighbouring property or cause inconvenience to the adjoining occupiers must be notified.
Examples of work covered by the Party Wall Act include:
- Cutting into a wall, e.g. to insert a damp proof course or to allow the seating of a beam
- Demolition and rebuilding of a party wall
- Raising the entire party wall, and cutting off any projections such as chimney breasts
- Excavation and construction of foundations for a new building or structure within 3 metres of a neighbouring owner’s building or structure, where work would go deeper than the neighbouring foundations
- Excavation or construction of foundations for a new building or structure within 6 metres of a neighbouring owner’s building or structure, where such excavation would cut through a plane extending down at 45 degrees from the bottom of the outside face of the neighbouring foundations.
- Cutting a flashing into the flank wall of an adjoining property.
A general overview and guidance provided by the Government can be viewed here but, if in doubt, advice should be sought from a surveyor with solid experience of party wall matters.
What Happens If the Act Applies?
If your works fall within the Act, you must serve written notice on the adjoining owner.
Once notice is served, your neighbour can:
- Consent to the works
- Dissent and agree to use one surveyor
- Dissent and appoint their own surveyor
If they dissent, a dispute is deemed to have arisen. Surveyors are then appointed and a party wall award is prepared to resolve that dispute.
The award sets out:
- The authorised works
- How they must be carried out
- Protective measures
- Access arrangements (if applicable)
- Procedures if damage occurs
You cannot lawfully begin the notifiable works until this process is complete.
What If My Neighbour Has Started Work?
If your neighbour has already started work and you believe it falls within the scope of the Act, the first question is whether notice should have been served.
Works that commonly require notice include:
- Cutting into a shared wall
- Installing steel beams
- Removing chimney breasts
- Excavating close to your foundations
If notice was required but not served, your neighbour may be in breach of the Act.
If it was a genuine error, and there are still works covered by the Act to complete, they should be happy to pause matters, serve the necessary notices and let the resulting procedures run their course before recommencing.
If the breach is deliberate, or they are refusing to remedy matters, you may need to consider a court injunction to protect your rights. It’s important to take legal advice before applying for an injunction as court action is expensive and recovering costs is not straightforward.
The key point is this: the Act is there to protect you and your neighbour. It creates a framework for resolving disputes without redress to court.
Serving a notice under the Party Wall etc. 1996 Act
The owner intending to undertake the building works must serve a written notice on the owners of the adjoining property, detailing the work to be carried out.
This must take place at least 2 months before the start of the planned work where the work directly affects a party structure or 1 month in advance for adjacent excavation and new walls at the boundary.
No work is permitted to start until all neighbouring parties have given their written consent or surveyors have been appointed and disputes settled by way of a party wall award.
Once an agreement has been reached, all work must comply with the notice and award (if one is required). It is important to keep records of all party wall documents, as a subsequent purchaser of the property may wish to verify that works were carried out in accordance with the party wall requirements.
As with any work affecting neighbouring properties, it is always recommended to maintain a dialogue with the neighbours in the interests of preserving harmonious relations.
Even in situations where a notice is required to be served, it is usually better to have an informal discussion about the intended work with your neighbour, taking their comments into serious consideration and, if possible, voluntarily amending your plans, prior to serving the notice.
Party Wall Act FAQs
Can Two or More Party Wall Awards Be Required?
Yes, in certain circumstances.
Each affected adjoining owner is entitled to be notified and to appoint their own surveyor if they dissent. Where multiple adjoining owners are affected by the same project, separate awards may be required.
For example, a terraced property may have neighbours on both sides. If both dissent, two separate awards are often prepared. Freehold and leasehold owners of the same property must both be notified if they are affected.
Even where a single adjoining owner is involved, complex projects can sometimes lead to supplementary awards if additional works arise later.
The important point is that the award relates to the dispute between specific parties. It is not a general approval for all possible future works.
Can I Dispute a Joint Party Wall Award?
Once an award has been served, it is legally binding unless appealed.
If you believe the award is incorrect or unfair, you have 14 days from service to appeal to the County Court.
Appeals are relatively rare and should not be undertaken lightly. The court will expect clear grounds, not simply dissatisfaction with the outcome.
If concerns arise during the drafting stage, it is usually better to raise them with the surveyor before the award is finalised.
If you are unsure whether an award properly protects your interests, seek advice immediately. The 14-day appeal window is strict.
What does the Party Wall Act Not Apply to?
The Act does not:
- Grant planning permission
- Replace building regulations approval
- Allow unsafe construction
- Automatically prevent development
It sits alongside planning and building control. Even if planning permission is not required, the Party Wall Act may still apply.
