If your proposed work affects a shared wall, a boundary or the ground close to your neighbour’s building, you may need to take action under the Party Wall etc. Act 1996 before construction begins. That could mean serving a Party Wall Notice, obtaining your neighbour’s written consent or, where there is dissent, putting a Party Wall Award in place.
The important point is that not every extension or loft conversion automatically requires a party wall agreement. It depends on what you are proposing to build and how the work affects adjoining properties.
What Is a Party Wall Agreement?
The term “party wall agreement” is widely used by homeowners and contractors, but it can describe different stages of the Party Wall process.
A party wall is generally a wall shared by two owners or used to separate buildings in different ownership. The Party Wall etc. Act 1996 also covers certain party structures, new walls built on or at a boundary, and excavations close to neighbouring buildings.
The Act is designed to give both the person carrying out the work and the adjoining owner a clear legal framework. It does not prevent building work from going ahead. Instead, it sets out how certain works should be notified, agreed and carried out.
This is where three terms are often confused:
- Party Wall Notice: formal notice telling the adjoining owner what work is proposed.
- Written consent: the adjoining owner agrees to the notified work.
- Party Wall Award: a formal document prepared by a surveyor or surveyors when the parties are in dispute or where an award is otherwise required.
What Is the Party Wall etc. Act 1996?
The Party Wall etc. Act 1996 applies in England and Wales. It covers work to existing party walls and party structures, new building on or at the boundary, and certain excavation near neighbouring buildings.
It is important not to confuse the Act with planning permission or building regulations. They are separate requirements. Having planning permission does not remove your obligations under the Party Wall Act, just as complying with the Party Wall Act does not mean your planning or building control requirements have been satisfied.
Do You Need a Party Wall Agreement for an Extension?
Possibly. An extension is more likely to fall within the Party Wall Act where the proposed works affect a party wall, are built on or near the boundary, or involve excavation close to a neighbouring building.
Examples can include:
- Building directly against or on a party wall
- Cutting into a party wall, such as to insert structural support
- Raising or extending a party wall
- Demolishing and rebuilding a party wall
- Building a new wall on or astride the boundary
- Excavating close to a neighbouring building, where the statutory conditions are met
For example, if the foundations for a rear extension involve excavation within the distances covered by section 6 of the Act and to the relevant depth, a notice may be required. The rules are not simply about the footprint of the extension; the depth and relationship between the proposed excavation and the neighbouring building matter too.
That is why looking only at an extension drawing is not always enough. The proposed construction method needs to be considered as well.
Do You Need a Party Wall Agreement for a Loft Conversion?
Again, not automatically. A loft conversion can involve structural alterations to a party wall, particularly in terraced or semi-detached homes. The most familiar example is installing steel beams where they require bearings or other work affecting the party wall.
The government’s guidance specifically gives cutting into a party wall to take the bearing of a beam, for example for a loft conversion, as an example of work covered by the Act.
Other loft conversion work may also raise Party Wall issues where it involves:
- Altering or strengthening a party wall
- Raising the wall
- Structural work affecting a party structure
- Removing features from a party wall, where the Act applies
- Excavation or foundation work associated with wider works
The fact that your project is described as a “loft conversion” does not, by itself, trigger the Act. It is the nature of the work that matters. That distinction is useful because homeowners often assume either that every loft conversion needs a party wall agreement or that none do. Neither is correct.
What Is a Party Wall Notice?
A Party Wall Notice is the formal notification given by the building owner to the adjoining owner before relevant work covered by the Act begins.
The building owner is responsible for serving the notice, although a surveyor may do this on their behalf where they have authority to act. The notice should identify the property, describe the proposed work and give the intended start date.
The notice period depends on the type of work.
For work to an existing party wall or party structure, the government guidance states that at least two months’ notice should generally be given. For certain excavation or new wall works at the boundary, the period is generally one month.
It is worth dealing with this early. Leaving the Party Wall process until just before your contractor is due to start can create unnecessary delays.
A practical conversation with your neighbour before the formal notice is served can also help. It does not replace the statutory process, but it can make the process considerably easier where everyone understands what is proposed.
What Happens If Your Neighbour Does Not Agree?
Receiving an objection from a neighbour does not necessarily mean your extension or loft conversion has to stop. There are generally three possible responses to a notice:
Your Neighbour Consents
If the adjoining owner gives written consent, the notified works may proceed subject to the relevant legal and construction requirements. Consent is different from simply having a friendly conversation over the garden fence. The statutory process is concerned with written consent.
Your Neighbour Dissents
Where the adjoining owner does not consent, the Party Wall Act provides a dispute resolution process involving an Agreed Surveyor or separate surveyors. You can read the RICS guidance on party walls for further information on how the process works. The owners can appoint an Agreed Surveyor, or each can appoint their own surveyor. The surveyor or surveyors then deal with the matter and prepare a Party Wall Award.
The Award can set out the permitted works, how and when they should be carried out, protective measures and other obligations between the parties. A record of the adjoining property’s condition is also commonly included.
Your Neighbour Does Not Respond
Silence should not be treated as consent. Under the government guidance, if an adjoining owner does nothing for 14 days after the relevant notice, a dispute is deemed to have arisen, and the statutory dispute-resolution procedure can follow.
That is one of the reasons it is risky to assume that “they haven’t objected, so we’re fine.” The correct next step depends on the notice and circumstances.
What Does a Party Wall Surveyor Do?
A party wall surveyor provides specialist advice on the Party Wall Act and helps administer the process where surveyor involvement is required.
Their role can include:
- Reviewing the proposed works
- Advising whether the Act is likely to apply
- Preparing or reviewing Party Wall Notices
- Inspecting the adjoining property where appropriate
- Preparing a schedule of condition
- Agreeing or preparing a Party Wall Award
- Setting out requirements for carrying out the work
- Dealing with issues or disputes arising during the process
The surveyor’s role is not simply to “take your side”. Under the Act, surveyors have to act in accordance with the legislation and, when determining an award, act impartially.
A schedule of condition can also be particularly useful. It records the condition of relevant parts of the adjoining property before work starts, often with written descriptions and photographs. That can provide useful evidence if a question later arises about whether damage was caused by the works.
How Much Does a Party Wall Surveyor Cost?
There is no single standard price for party wall surveyor services. The cost can depend on several factors, including:
- The complexity of the proposed works
- The number of adjoining owners involved
- Whether one agreed surveyor or separate surveyors are appointed
- Whether a formal Party Wall Award is required
- The condition and accessibility of the properties
- The amount of work involved during the project
For straightforward works where the adjoining owner provides written consent, the process may be relatively simple. A more complicated project involving multiple neighbours, detailed structural works or a dispute can require substantially more surveyor involvement.
The government guidance also notes that surveyor fees will normally fall to the building owner serving the notice, although the Act allows costs to be apportioned in certain circumstances.
Rather than choosing a surveyor purely on the lowest initial fee, it is sensible to understand exactly what is included in the quotation and what happens if the project becomes more complicated.
Party Wall Agreement vs Planning Permission
One of the most common misunderstandings is assuming that planning approval covers everything needed before construction starts.
It does not.
| Party Wall Matters | Planning Permission |
| Governed by the Party Wall etc. Act 1996 | Governed by planning legislation |
| Concerned with certain works affecting adjoining owners, boundaries and nearby excavation | Concerned with whether proposed development requires planning approval and can take place |
| May involve notices, written consent and/or a Party Wall Award | May involve an application and planning conditions |
| Designed to protect the rights of building and adjoining owners | Focuses on development and land-use control |
The government specifically confirms that the Party Wall Act is separate from planning permission and building regulations. Obtaining one does not remove the need to comply with the others where they apply.
What Should You Do Before Starting an Extension or Loft Conversion?
It is much easier to resolve Party Wall issues before your contractor is on site than after work has already started.
A sensible starting process is:
- Identify the adjoining owners affected by the proposed works.
- Review the drawings and construction method, not just the finished design.
- Check whether the Party Wall etc. Act 1996 applies to the proposed works.
- Serve the appropriate notice where required.
- Allow the relevant statutory notice period.
- Obtain written consent where the adjoining owner agrees.
- Appoint a Party Wall Surveyor or Agreed Surveyor where the statutory process requires it.
- Complete the Party Wall Award and schedule of condition, where applicable.
- Begin the relevant works in accordance with the agreed and statutory arrangements.
This early review is particularly useful where structural drawings are still being developed. A change to the construction method can sometimes affect whether Party Wall procedures are needed.
Do You Need a Party Wall Surveyor?
Not every extension or loft conversion requires you to appoint a surveyor. If the Act does not apply, there may be no Party Wall process to administer. Even where the Act does apply, an adjoining owner may simply give written consent rather than requiring surveyors to resolve a dispute.
However, professional advice can be worthwhile where the position is unclear, the works are technically involved, or there is concern about how a neighbour may respond. A party wall surveyor can help establish what needs to happen before construction begins and, where necessary, manage the formal process under the Act.
That is often preferable to discovering the issue after a contractor has been booked and work is ready to start.
Frequently Asked Questions
- Do I need a Party Wall Agreement for an extension?
Not necessarily. It depends on the proposed works and whether they fall within the Party Wall etc. Act 1996. Works affecting a party wall, boundary or certain excavations near a neighbouring building may require a notice and further action under the Act.
- Do I need a Party Wall Agreement for a loft conversion?
A loft conversion does not automatically require a Party Wall Agreement. However, structural works such as cutting into a party wall to support beams can fall within the Act.
- How long before building work should I serve a Party Wall Notice?
The statutory notice period depends on the type of work. Generally, work to an existing party wall requires at least two months’ notice, while certain excavation and boundary works require one month.
- What happens if my neighbour objects to my extension?
An objection does not automatically prevent the work. Where the adjoining owner dissents, the Party Wall Act provides a procedure involving an Agreed Surveyor or separate surveyors and a Party Wall Award.
- Can I start building before serving a Party Wall Notice?
You should not assume that you can. Where your proposed works fall within the Act, the appropriate statutory notice and process should be followed before relevant works begin. Starting without the required notice can expose the building owner to legal remedies, including the possibility of an injunction.
- Do I need a Party Wall Surveyor?
Not in every case. However, a surveyor can provide professional advice where it is unclear whether the Act applies, and may need to be appointed where an adjoining owner dissents and a Party Wall Award is required.
Planning an Extension or Loft Conversion?
If your proposed building works could affect a neighbouring property, party wall or boundary, it is worth understanding your Party Wall obligations before construction starts.
Getting the process right at the outset can help avoid unnecessary delays, misunderstandings and disputes later in the project.
Speak to MBS Surveyors about your proposed works and Party Wall requirements
