A party wall is a shared wall, boundary, or structure that sits between two properties owned by different people. It is most common in terraced and semi-detached homes, but it can also apply to garden walls, boundary walls, and some outbuildings.
If you are planning building work near a shared boundary, you may need to follow the Party Wall etc. Act 1996. This law applies in England and Wales and is designed to protect both the person carrying out the work and the neighbouring property owner.
Understanding party walls early can help avoid delays, disputes, legal issues, and unexpected costs. It also gives everyone a clear record of what work is being carried out, how it will be managed, and who is responsible if damage occurs.
What Is A Party Wall And How Does It Work?
A party wall is a shared structure between two properties. It may form part of a building, sit on a boundary line, or separate buildings owned by different people.
The Party Wall Act 1996 sets out the legal process for carrying out certain building work that may affect a shared wall or nearby structure. This usually involves serving written notice to the affected neighbour before work begins.
If the neighbour agrees, the process can be straightforward. If they disagree or do not respond, a party wall surveyor may need to be appointed to prepare a formal Party Wall Award.
This article will cover:
- What is a party wall agreement?
- When do you need a party wall agreement?
- How long does a party wall agreement last?
- Who pays for a party wall surveyor?
- Can you start building work without a party wall agreement?
- How to get a party wall agreement
What Is A Party Wall Agreement?
A party wall agreement is a legally binding document between property owners when building work affects a shared wall, boundary, or nearby structure.
The formal document is often called a Party Wall Award. This is usually required when a neighbour does not give simple written consent, or when there is a dispute about the proposed work.
A Party Wall Award sets out the rights and responsibilities of both property owners. It explains what work will be carried out, when it will take place, how it should be carried out, and the protections in place for the neighbouring property.
The agreement is governed by the Party Wall etc. Act 1996. This law applies to building work in England and Wales.
A party wall agreement may include:
- A description of the planned work
- The properties affected
- Working hours and access arrangements
- Details of temporary protection
- The appointed surveyor or surveyors
- A schedule of condition
- Responsibilities if damage occurs
- Any special requirements agreed between the parties
A schedule of conditions is especially useful. This records the condition of the neighbouring property before work begins. It may include photographs, notes, and details of any existing cracks or defects.
This helps protect both sides. The building owner is protected against unfair claims, while the adjoining owner has a clear record if genuine damage happens during the work.
For builders, the agreement can also be useful on site. It gives clear instructions and helps confirm what can and cannot be done during construction.
When Do You Need A Party Wall Agreement?
You need a party wall agreement if you plan to carry out building work in England or Wales near or directly on a shared property boundary.
Not every project needs one. Simple decorating, plastering, or minor repairs usually do not require a party wall notice. However, structural work, excavation, and work close to a boundary often do.
Common projects that may require a party wall agreement include:
- Building a rear or side extension
- Carrying out a loft conversion
- Removing a chimney breast from a party wall
- Cutting into a party wall to insert beams
- Underpinning a party wall
- Building a new wall on or near a boundary
- Excavating near a neighbouring building
- Building foundations close to another property
- Altering a shared garden wall
- Repairing or rebuilding a party wall
A common example is a loft conversion in a terraced house. If steel beams need to be inserted into the party wall, the work will usually fall under the Act.
Another example is a rear extension. If foundations are being dug close to a neighbouring structure, the adjoining owner may need to be notified.
It is important to remember that planning permission and party wall matters are separate. A project may have planning approval and building regulations approval, but still needs party wall notices before work begins.
For builders, this is an important point to raise with clients early. If the party wall process is missed, the project could be delayed before work starts on site.
How Long Does A Party Wall Agreement Last?
A Party Wall Notice is valid for 12 months from the date it is served. If construction has not started within this period, the notice expires, and a new notice must be served.
The minimum notice period depends on the type of work. In many cases, notice must be served at least two months before work starts. For some excavation works, the notice period may be one month.
Once a formal Party Wall Award is in place, it remains active and enforceable during the construction work. It controls how the work should be carried out and sets out each party’s responsibilities.
There is no strict statutory expiry date for the Award itself. However, many surveyors include a clause stating that work must start within 12 months.
After the work is complete, the Award remains an important legal record. It can still be used as evidence if a dispute, damage claim, or structural defect arises later.
This is why the schedule of conditions matters. If the adjoining owner later claims damage, the Award and condition record can help show whether the issue was already present before work began.
For property owners, keeping a copy of the Award is important. It may be needed during a future sale, insurance claim, or dispute.
For builders, the Award should be checked before work starts. It may include important site requirements, such as access limits, working hours, protective measures, or temporary weatherproofing.
At Bhangals Construction Consultants, we understand how important early planning is across construction projects. Through our Quantity Surveying Services in London, we help clients manage project costs, risks, and responsibilities before work begins.
Who Pays For A Party Wall Surveyor?
In most cases, the building owner pays the reasonable fees for the party wall surveyor. The building owner is the person carrying out the building work.
This usually includes the cost of their own surveyor and the reasonable fees of the adjoining owner’s surveyor if one is appointed. This ensures the neighbour is not financially out of pocket because of work being carried out next door.
There are two common options when surveyors are needed.
The first option is to appoint one agreed surveyor. This means both owners use the same impartial surveyor. The surveyor does not act for one side. Their role is to administer the Act fairly and prepare the Party Wall Award.
The second option is for each owner to appoint their own surveyor. In this case, the two surveyors work together to agree on the Award. If they cannot agree, a third surveyor may be selected to help resolve the dispute.
Using one agreed surveyor can be quicker and more cost-effective. However, separate surveyors may be more suitable where the project is complex or where there is less trust between neighbours.
Party wall surveyor fees can vary depending on:
- The type of work being carried out
- The number of adjoining owners involved
- Whether one or two surveyors are appointed
- The complexity of the drawings
- The condition of the neighbouring property
- Whether access or temporary protection is needed
- Whether disputes arise during the process
For builders and clients, these costs should be allowed for early in the project budget. They may not be the highest cost on a build, but they can still cause delays if they are ignored.
This is why early cost planning matters. You can also read our previous article on what a quantity surveyor does to understand how professional cost support can help reduce risk before a project begins.
This is where experienced Quantity Surveyors in London can support wider cost planning, helping clients understand professional fees, risk allowances, and early-stage project costs. RICS party wall guidance explains the role of surveyors and professional standards.
Can You Start Building Work Without A Party Wall Agreement?
You should not start notifiable building work without following the correct party wall process.
If the work falls under the Party Wall etc. Under the Act 1996, you must serve the correct notice and either receive written consent or have a Party Wall Award in place before work begins.
Starting work without the right notice or agreement can create serious problems. Your neighbour may apply to the court for an injunction to stop the work. This can delay the project, increase legal costs, and damage relationships among property owners.
It can also create problems if damage occurs. Without a schedule of conditions or a formal agreement, it may be harder to prove what damage existed before work started.
For builders, starting without proper confirmation can be risky. Even if the client says everything is sorted, it is sensible to ask whether party wall matters have been dealt with before carrying out notifiable work.
If party wall requirements have not been handled correctly, the project may face:
- Work stoppages
- Legal disputes
- Injunctions
- Additional surveyor fees
- Programme delays
- Neighbour complaints
- Damage claims
- Insurance complications
- Increased project costs
The issue is not just legal. It can affect the full construction programme, including labour, subcontractor bookings, material deliveries, and plant hire.
It is always better to deal with party wall matters before work starts. In many cases, the process can be handled smoothly if notices are served early and communication is clear. You can check the GOV.UK neighbour dispute guidance here if you are concerned about your neighbours.
How To Get A Party Wall Agreement
To get a party wall agreement, the building owner must serve a formal Party Wall Notice on the affected neighbour or neighbours.
If they give written consent, the work can usually proceed without a formal Party Wall Award. If they dissent or do not respond within 14 days, surveyors must be appointed to prepare the Award.
Here is the step-by-step process.
1. Check Whether The Work Is Notifiable
The first step is to check whether the planned work falls under the Party Wall etc. Act 1996.
This usually means checking whether the work affects:
- A shared wall
- A party structure
- A boundary wall
- A new wall on or near the boundary
- Excavation close to a neighbouring structure
This should be reviewed before work begins. Ideally, it should be checked during the design stage, before costs and timescales are finalised.
This is also where Building Surveying advice can be useful, especially when existing structures, defects, access issues, or neighbouring buildings may affect the proposed work.
2. Serve A Party Wall Notice
Once it is clear that notice is required, the correct Party Wall Notice must be prepared and served in writing.
The notice should explain:
- The building owner’s details
- The adjoining owner’s details
- The type of work being carried out
- The proposed start date
- Relevant drawings or details
- Whether access is required
- The section of the Act being used
A verbal conversation with a neighbour is not enough. The notice must be served correctly and in writing.
It is often a good idea to speak with neighbours before sending the formal notice. This helps explain the project and may make the process smoother.
3. Wait For The Neighbour’s Response
After the notice has been served, the adjoining owner has 14 days to respond in writing.
They usually have three options.
They can consent to the work. This means they agree to the works going ahead. In this case, a formal Party Wall Award is not normally required, but a schedule of condition is still sensible.
They can dissent. This does not always mean they are trying to stop the work. It simply means they want the formal process to be followed.
They can serve a counter-notice. This may happen if they request specific additional work or adjustments.
If the adjoining owner does not respond within 14 days, this is treated as a dispute under the Act. Surveyors will then need to be appointed.
4. Appoint A Party Wall Surveyor If Needed
If the adjoining owner dissents or does not respond, a surveyor must be appointed.
Both owners can agree to use one surveyor, known as the agreed surveyor. This person acts impartially and prepares the Award in line with the Act.
Alternatively, each owner can appoint their own surveyor. The two surveyors will then agree on the terms of the Award. If they cannot agree, they may refer the issue to a third surveyor.
The surveyor may review:
- Proposed drawings
- Construction details
- Excavation plans
- Structural information
- Access requirements
- Risks to the adjoining property
- The condition of the neighbouring property
- Temporary protection requirements
Choosing the right surveyor is important. They should understand the Act, the type of building work being carried out, and the practical risks involved.
5. Obtain The Party Wall Award
The surveyor or surveyors will prepare the Party Wall Award. This is the formal legal document that confirms how the works can proceed.
The Award may include:
- The details of the proposed works
- Working hours
- Access arrangements
- Protection measures
- Requirements for making good damage
- Surveyor fees
- Drawings and specifications
- The schedule of conditions
- Procedures if further issues arise
Once the Award is agreed and served, building work can usually begin in line with its terms.
Both parties have a limited period to appeal the Award if they believe it is incorrect. This is why the document should be carefully reviewed upon receipt.
At Bhangals Construction Consultants, our Chartered Quantity Surveyors in London support clients with practical cost and project advice from early planning through to completion. This helps clients understand risks before they become expensive problems.
Why Party Wall Planning Matters
Party wall matters can affect cost, timing, access, risk, and neighbour relationships. If the process is handled early, it can usually be managed without major disruption. If it is ignored, it can delay the project and lead to unnecessary disputes.
The main points to remember are:
- A party wall is a shared wall, boundary, or structure between properties.
- A party wall agreement may be needed before certain building works begin.
- Notices must be served correctly and within the right timescales.
- Neighbours have 14 days to respond.
- If there is no consent, surveyors may need to prepare a Party Wall Award.
- The building owner usually pays the reasonable surveyor fees.
- Notifiable work should not start until the correct process has been followed.
- A schedule of condition helps protect both parties if damage is later claimed.
So, what is a party wall? In simple terms, it is a shared structure that may need legal protection when building work is planned nearby. Understanding the process helps reduce risk and gives everyone involved more confidence before construction begins.
At Bhangals Construction Consultants, we help clients plan construction projects with clarity, accuracy, and control. From early cost advice to project support, our team provides practical guidance that helps reduce risk and avoid costly surprises.
Whether you are planning an extension, refurbishment, or larger development, our team is here to support you from the beginning. If you are looking for reliable Quantity Surveyors in London, get in touch with Bhangals today to discuss your project.