Party Wall • Building Works • Neighbour Disputes
If you’re planning building work that affects a shared wall, boundary, or neighbouring property, the Party Wall etc. Act 1996 may apply.
Many homeowners don’t realise this until they’re already mid-project — which can cause disputes, delays, and legal complications.
This guide explains what a party wall agreement is, when it’s required, and what a party wall surveyor does.
Use it before you start any extension, loft conversion, or excavation work near a boundary.
Quick answer
A party wall agreement (formally called a Party Wall Award) is a legal document produced by a party wall surveyor that sets out the rights and responsibilities of both the building owner and their neighbour during and after building work.
It protects both parties — not just the neighbour.
When does it apply?
Work to a shared wall, loft conversion on a terraced or semi-detached home, rear extensions, basement work, or excavation within 3–6 metres of a neighbour’s foundation.
Not all building work triggers the Act — but it’s important to check before you start.
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 relating to party walls, party structures, and excavations near neighbouring properties.
It applies across England and Wales. Scotland and Northern Ireland have their own separate legal frameworks for similar situations.
The Act sets out a process that property owners must follow before carrying out certain types of work. This process protects the interests of both the person doing the building work (the “building owner”) and their neighbour (the “adjoining owner”).
Important: The Party Wall Act does not prevent building work — it creates a managed process for carrying it out. Following the process protects you legally and practically, regardless of whether your neighbour is supportive or not.
What is a party wall?
A party wall is a wall that sits on the boundary between two properties and is shared by both owners. It includes:
- Walls that separate adjoining buildings (e.g., the shared wall between two terraced houses)
- Walls that stand astride a boundary between properties
- Floors and ceilings between flats (referred to as party structures)
- Garden walls that stand on the boundary line between two properties
The shared nature of these structures means that work to them — or near them — affects both property owners, even if only one is carrying out the work.
When Does the Party Wall Act Apply?
The Act applies to three main categories of work:
1. Works on or to a party wall (Section 2)
This includes:
- Cutting into a party wall to insert a damp-proof course
- Raising or lowering a shared wall
- Demolishing and rebuilding a party wall
- Underpinning a party wall
- Cutting away overhanging parts of a party wall
- Building on or against a party wall
2. New walls on the boundary (Section 1)
If you’re building a new wall on or near the boundary between two properties — even if it sits entirely on your land — this may still trigger the Act depending on how close it is to the boundary.
3. Excavation near the boundary (Section 6)
If you’re excavating within 3 metres of a neighbouring property’s foundations, or within 6 metres where the depth of excavation will cut below a line drawn at 45 degrees from the bottom of the neighbour’s foundations, the Act applies. This commonly affects:
- Basement conversions and extensions
- Swimming pools near boundaries
- Deep drainage or service runs
Not sure if your project triggers the Act? It’s always worth checking with a party wall surveyor before you serve any notice. Acting before you’ve confirmed the position could create problems.
Common projects that often trigger the Party Wall Act
| Project Type | Likely to trigger? | Section |
|---|---|---|
| Rear extension (terraced or semi) | Often yes | Section 2 and/or 6 |
| Loft conversion (shared gable or roof) | Often yes | Section 2 |
| Basement conversion or dig | Usually yes | Section 6 |
| Single-storey rear extension (detached) | Sometimes (if near boundary) | Section 6 |
| Internal work only (no shared walls) | Typically no | N/A |
| New boundary wall (on or near boundary) | Possibly | Section 1 |
What Is a Party Wall Notice?
Before carrying out work covered by the Act, the building owner must serve a Party Wall Notice on their neighbour. This is a formal written notice that informs the adjoining owner of the intended work.
Notice periods
- Section 1 (new boundary walls): 1 month’s notice
- Section 2 (party wall works): 2 months’ notice
- Section 6 (excavation): 1 month’s notice
These notice periods cannot be waived even if your neighbour is in agreement — the Act requires the process to be followed in writing.
What the neighbour can do after receiving a notice
The adjoining owner has options:
- Consent in writing: The work can proceed without a formal award. This is the simplest outcome and avoids surveyor fees on the neighbour’s side.
- Dissent and agree to appoint a single agreed surveyor: Both parties jointly appoint one surveyor to produce the Award.
- Dissent and appoint their own surveyor: The two surveyors (one for each party) then agree on an impartial third surveyor if needed. Each party pays for their own surveyor; the third surveyor’s fee is decided between the surveyors.
If the neighbour does not respond within 14 days, a dispute is deemed to have arisen and the parties must appoint surveyors.
What Does a Party Wall Surveyor Do?
A party wall surveyor is an independent professional who acts impartially to resolve matters under the Party Wall Act. Despite being instructed by one party, they have a statutory duty to act fairly and independently — they are not an advocate for the person who appointed them.
Key responsibilities
- Advise on whether the Act applies to the proposed works
- Draft and serve party wall notices on behalf of the building owner
- Carry out a schedule of condition — a photographic and written record of the neighbouring property’s current condition before work begins
- Produce the Party Wall Award — the formal document that sets out what work can be done, when, and under what conditions
- Resolve disputes if they arise about the scope or impact of the work
- Inspect the work during and after completion if required
Why the schedule of condition matters: This pre-work record is your protection if a neighbour later claims that the building work caused damage. Without it, disputes about pre-existing versus new damage are much harder to resolve.
Do you need a party wall surveyor?
You need a party wall surveyor if:
- Your work triggers the Party Wall Act and your neighbour dissents
- Your neighbour doesn’t respond to your notice within 14 days
- You want professional guidance on whether your project triggers the Act
- You want to ensure the notice and Award are correctly produced (errors can have legal consequences)
- Your neighbour has served a notice on you and you want independent advice
Even where consent is given in writing, many building owners choose to involve a party wall surveyor to ensure the process is correctly managed and documented — particularly for significant projects like basement conversions or major extensions.
What Is a Party Wall Award?
A Party Wall Award (often referred to as an agreement, though “Award” is the correct legal term) is the formal document produced by the party wall surveyor(s). It sets out:
- A description of the work to be carried out
- The schedule of condition of the neighbouring property before work begins
- Hours of work and access arrangements
- How any damage caused will be assessed and remedied
- The rights of the adjoining owner to access the building owner’s property where necessary
- The surveyor’s fees (who pays what)
The Award is a legally binding document. Either party can appeal it to the County Court within 14 days of service, but this is uncommon. Most Awards are accepted and work proceeds under the agreed conditions.
How long does the party wall process take?
The timeline depends on how quickly notices are served, how the neighbour responds, and how straightforward the works are.
- If the neighbour consents promptly: The process can be complete in a few weeks
- If a surveyor Award is required: Typically 4–8 weeks from notice to Award, depending on the complexity of the works and the cooperation of both parties
It’s important to factor this timeline into your project planning — you cannot legally start notifiable work until the process is complete or consent has been given in writing.
What Happens If You Ignore the Party Wall Act?
Failing to follow the Party Wall Act process can have serious consequences:
- Your neighbour may obtain an injunction stopping the work — even if it’s already underway
- You may be liable for any damage caused, with no schedule of condition to clarify what was pre-existing
- Disputes become far harder and more expensive to resolve without the formal Award process
- It can affect your ability to sell the property if there are unresolved party wall disputes on record
Following the Act protects you as much as it protects your neighbour. The process is designed to enable work to proceed smoothly, not to prevent it.
If your neighbour disagrees or does not respond, the process moves to a formal party wall award — a legally binding document that sets out exactly what work can proceed and on what terms.
Need a party wall surveyor in Lincolnshire or Nottinghamshire?
LM Surveyors provides party wall surveyor services across Lincolnshire, Nottinghamshire, and surrounding areas. We can advise on whether your project triggers the Act, serve the required notices, and produce a clear, thorough Party Wall Award to protect your interests.
Speak to a surveyor before you start work — getting the process right from the beginning avoids delays and disputes down the line.
