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Party Wall Act at a glance
The Party Wall etc. Act 1996, often called the Party Wall Act, is the legal process for notifying neighbours about certain building works and resolving disputes before or during notifiable works.
- It applies in: England and Wales.
- It commonly affects: loft conversions, rear extensions, basement works, chimney breast removals, steel beam insertions, new boundary walls and excavations near neighbouring properties.
- It is separate from: planning permission, permitted development rights and Building Regulations.
- Typical notice periods: 2 months for party-structure works; 1 month for line-of-junction and excavation notices.
- If there is a dispute: an Agreed Surveyor or two appointed surveyors prepare a Party Wall Award.
The Party Wall Act helps building owners carry out certain works while protecting neighbouring properties. In simple terms, it explains when you must notify your neighbours, how long they have to respond, and what happens if they consent, dissent or do not reply.
In London, the Party Wall Act is commonly relevant to terraced houses, semi-detached properties, flats, mansion blocks, maisonettes, extensions, loft conversions and basement projects. If your works affect a shared wall, a boundary wall, a party structure, or involve excavation close to a neighbour’s foundations, you may need to serve a valid Party Wall Notice before work begins.
Party Wall Act explained in simple terms
The Party Wall Act is a statutory process for preventing and resolving disputes about certain building works on or near shared walls, boundaries and neighbouring foundations. It does not usually stop lawful building work from taking place, but it does require the correct notices, neighbour responses and surveyor procedure where the Act applies.
What is the Party Wall Act?
The Party Wall Act is the common name for the Party Wall etc. Act 1996. It sets out a legal procedure for certain works on or near neighbouring property. The Act helps ensure that neighbours are informed, the condition of adjoining property can be recorded, access can be managed, and disputes can be resolved by appointed surveyors where required.
The person carrying out the works is usually called the Building Owner. The neighbour, freeholder, leaseholder or other relevant owner affected by the works is usually called the Adjoining Owner. Either side may need advice depending on the project, the notice served and the response given.
When does the Party Wall Act apply?
The Party Wall Act usually needs to be considered where your project falls into one or more of three categories: building on or at the boundary line, carrying out work to an existing party wall or party structure, or excavating near and below the foundation level of a neighbouring building or structure.
| Notice type | Typical works | Minimum notice period | Related guide |
|---|---|---|---|
| Section 1: Line of Junction Notice | Building a new wall at or astride the boundary line. | Usually 1 month | Party Wall Section 1 explained |
| Section 2: Party Structure Notice | Cutting into, raising, underpinning, repairing, demolishing or altering an existing party wall or party structure. | Usually 2 months | Party Wall Section 2 explained |
| Section 6: Adjacent Excavation Notice | Excavating within 3 metres or 6 metres of a neighbouring building where the Act’s depth rules are met. | Usually 1 month | Party Wall Section 6 explained |
Notice periods are general guidance. Some projects need more than one notice type, and works should not be started before the correct Party Wall Act procedure has been followed.
What does the Party Wall Act cover?
The Party Wall Act can cover a wide range of works, but it does not apply to every building project. It is most likely to apply where works affect a shared wall, a shared structure, the boundary line, or excavation close to neighbouring foundations.
- New walls at the boundary, including walls built up to or astride the line of junction.
- Work to an existing party wall, such as cutting in steel beams, inserting padstones, raising a wall or removing a chimney breast.
- Work to a party structure, including floors, ceilings or partitions separating flats, maisonettes or converted houses.
- Excavation close to neighbouring buildings, especially where the proposed excavation is deeper than the neighbour’s foundations.
- Basement works and underpinning, which usually need more detailed Party Wall surveying and Schedule of Condition evidence.
Common London projects affected by the Party Wall Act
Many ordinary home improvement projects can trigger the Party Wall Act, especially where London properties are close together or share structural elements. You should take advice early if you are planning:
- A loft conversion involving steel beams, padstones, cutting into a party wall, raising a party wall or work to a shared chimney.
- A rear extension with foundations near a neighbour’s house, extension, conservatory or outbuilding.
- Basement works, underpinning or deeper excavation close to adjoining structures.
- Chimney breast removal where the chimney is on or connected to a party wall.
- A new wall at or near the boundary, including a garden wall or extension flank wall.
- Excavations for new foundations close to a neighbouring building or structure.
Party Wall Act explained simply: the process
The Party Wall Act process is usually easier to understand as a sequence. The exact route depends on the works, the notice type, the adjoining owner’s response and whether a dispute arises under the Act.
-
Check whether the Party Wall Act applies
Your drawings, structural details, proposed foundations and ownership details are reviewed to identify whether the works are notifiable. -
Serve the correct Party Wall Notice
The Building Owner, or a surveyor acting with written authority, serves notice on all relevant Adjoining Owners. -
Your neighbour responds
The Adjoining Owner can consent, dissent and appoint their own surveyor, or dissent and agree to use one Agreed Surveyor. -
If there is a dispute, surveyors are appointed
A “dispute” under the Act does not necessarily mean an argument. It usually means the surveyor procedure is now needed. -
A Party Wall Award is agreed
The Award sets out the authorised works, practical safeguards, access arrangements, damage procedures and surveyor costs. -
Works proceed with a clear framework
Once the relevant notice, consent or Award process is in place, the notifiable works can usually proceed in accordance with the Party Wall Act procedure and the terms of any Award.
Party Wall Act, Party Wall Notice, Agreement or Award?
These terms are often used interchangeably by homeowners, but they mean different things. Understanding the difference can help you avoid delay, invalid notices or disputes with your neighbour.
| Term | What it means | When it matters |
|---|---|---|
| Party Wall Act | The legislation that sets out the notice and dispute resolution process. | When proposed works affect a party wall, party structure, boundary or nearby foundations. |
| Party Wall Notice | The formal document served on adjoining owners before notifiable works begin. | At the start of the process where the Act applies. See our Party Wall Notices London service. |
| Party Wall Agreement | A common homeowner phrase for written neighbour consent or the surveyor-agreed outcome. | Where the neighbour consents or the matter proceeds to an Award. See our Party Wall Agreement guide. |
| Party Wall Award | The formal document agreed by surveyor(s) when a dispute arises under the Act. | Where an adjoining owner dissents or does not respond. See our Party Wall Awards London service. |
What is a party wall?
A party wall is usually a wall shared by two properties. It may stand astride the boundary, form part of one or more buildings, or stand wholly on one owner’s land but be used by both owners to separate their buildings.
A party fence wall is usually a masonry boundary wall standing astride the boundary, such as a garden wall. Timber fences and hedges are not party fence walls.
For a more detailed explanation, read: What is a party wall?
What is a party structure?
A party structure is wider than a party wall. It can include a wall, floor, partition or other structure separating buildings or parts of buildings in different ownership. This is particularly relevant in London flats, maisonettes, mansion blocks and converted houses.
Related guide: Party wall vs party structure — what’s the difference?
Is a Party Wall Notice the same as a Party Wall Agreement?
Not quite. A Party Wall Notice is the formal document served at the start of the process. A “party wall agreement” is often used by homeowners as a general phrase for the neighbour’s written consent or the final Party Wall Award.
If the neighbour consents in writing, there may be no need for a Party Wall Award at that stage. If they dissent or do not respond where the Act treats this as a dispute, surveyor appointments are needed and the matter is resolved by a Party Wall Award.
Related guide: What is a Party Wall Agreement?
Party Wall Act advice for Building Owners and Adjoining Owners
The Party Wall Act affects both sides. The Building Owner needs to serve the correct notices before notifiable works proceed. The Adjoining Owner needs to understand the notice, the proposed works and their response options.
| Building Owner | Adjoining Owner |
|---|---|
| You are planning building works that may fall under the Party Wall Act. | You have received a Party Wall Notice or are concerned about nearby works. |
| You may need drawings, structural information and adjoining owner details before serving notice. | You should review the notice, drawings and likely risk before deciding whether to consent or dissent. |
| If your neighbour dissents, the surveyor appointment and Award process usually follows. | Dissenting does not necessarily stop lawful works, but it activates the Act’s surveyor procedure. |
| View Building Owner Surveyor services. | View Adjoining Owner Surveyor services. |
How can a neighbour respond to a Party Wall Notice?
Once a valid notice is served, the Adjoining Owner usually has three practical options:
- Consent in writing — the works can usually proceed after the relevant notice period, or sooner if the neighbour agrees in writing.
- Dissent and appoint their own surveyor — the Building Owner’s surveyor and the Adjoining Owner’s surveyor agree the Award.
- Dissent and agree to one Agreed Surveyor — one impartial surveyor acts for both owners under the Act.
If you have received a notice and need advice, see our Adjoining Owner Surveyor services or read our guide on how to respond to a Party Wall Notice.
What happens if my neighbour ignores the notice?
The answer depends on the notice type.
- For Party Structure Notices and Adjacent Excavation Notices: if the Adjoining Owner does not respond in writing within 14 days, a dispute is usually deemed to have arisen and surveyors are appointed.
- For a new wall astride the boundary: if the Adjoining Owner does not consent in writing, you cannot simply build the wall astride the boundary. You may need to build wholly on your own land instead.
- For a new wall wholly on your own land: if the correct notice has been served, the work can usually start after the one-month notice period, subject to the specific facts.
If you are already in a difficult situation, read more about Party Wall dispute resolution or see our guide on neighbour building without a Party Wall Notice.
What is a Party Wall Award?
A Party Wall Award is a legal document prepared by the appointed surveyor or surveyors. It records the notifiable works, sets out how they should be carried out, and deals with practical safeguards such as access, working methods, protection, making good damage and surveyor costs.
The Award is designed to protect both sides: it allows the Building Owner’s project to proceed while giving the Adjoining Owner a clear record of what has been authorised under the Party Wall Act.
Why is a Schedule of Condition important?
A Schedule of Condition is a written and photographic record of the adjoining property before works begin. It is not always a strict legal requirement, but it is strongly recommended for many London projects.
It helps avoid arguments about whether cracking, movement or other damage existed before the works. For higher-risk projects, such as basement excavations, a more detailed basement Schedule of Condition may be required.
Party Wall Act, planning permission and Building Regulations
The Party Wall Act is separate from planning permission and Building Regulations. This is a common source of confusion for homeowners who have already secured planning approval or are relying on permitted development rights.
- Planning permission deals with whether the development is acceptable in planning terms.
- Building Regulations deal with technical standards for design and construction.
- The Party Wall Act deals with notifying neighbours and resolving disputes for specific works on or near shared structures, boundaries and neighbouring foundations.
You may need all three depending on the project.
How much does the Party Wall Act process cost?
Party Wall costs depend on the type of works, the number of adjoining owners, whether notices are consented to, whether surveyors are appointed, and whether a Schedule of Condition or Party Wall Award is required. For a wider overview, see our guide to Party Wall Surveyor costs in London.
Typical fixed fees from Hourican Associates
Party Wall Notice Service: £150 + VAT per adjoining owner.
Schedule of Condition Surveys: £385–£585 + VAT depending on the works and size of property.
Basement Schedule of Condition: priced separately because basement works often require a more detailed inspection of the entire adjoining property.
Full Party Wall Award service: typically £1,100–£1,500 + VAT, depending on the property and project size.
Why choose Hourican Associates?
Hourican Associates are a Chartered Building Consultancy specialising in Party Wall surveying across London. We help Building Owners serve valid notices, advise Adjoining Owners who have received notices, prepare detailed Schedules of Condition, and agree Party Wall Awards where required.
- Chartered Building Consultancy specialising in Party Wall matters.
- Fully qualified members of the FPWS and Pyramus & Thisbe Club.
- Regulated by RICS, CIOB and MCABE.
- Clear fixed-fee options for notices, surveys and Awards.
- London-focused advice for terraced houses, flats, extensions, lofts, excavations and basement works.
Useful related Party Wall Act guides
These related guides explain specific parts of the Party Wall Act process in more detail.
- Party Wall Section 1 explained
- Party Wall Section 2 explained
- Party Wall Section 6 explained
- Party Wall Notice explained
- Party Structure Notice explained
- What makes a Party Wall Notice valid?
- Party Wall Act misunderstandings
- Party Wall Act associations and regulators
- Building Owner Party Wall information
- Adjoining Owner Party Wall information
- Free Party Wall Notice template
- Free Party Wall Acknowledgement template
Frequently Asked Questions
Need Party Wall Act advice in London?
Hourican Associates can review your plans, confirm whether the Party Wall Act applies, serve the correct notices and manage the Award process where needed. We work across London for homeowners, developers, architects and adjoining owners.
Get Free Party Wall Advice Request an Online QuoteHourican Associates are a Chartered Building Consultancy specialising in Party Wall surveying in London. This page is general guidance only and is not legal advice. Project-specific advice depends on the works, property, ownership and adjoining owner response.
Richard Hourican, Company Director
BSc (Hons). HND Build. MCIOB. C.Build E MCABE. ARICS. MFPWS. MPTS
As a specialist Party Wall surveyor, Richard Hourican will protect your interests during building works.
Are you planning a building project – perhaps an extension, loft conversion or basement – that is on or adjacent to your property’s boundary line? Or has a ‘Party Wall’ notice dropped on the doormat informing you of a neighbour’s impending works?
It’s essential to understand all the implications of building plans. If you don’t, it could cost thousands. Our job is to ensure everything is done correctly – and that it doesn’t!
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