If you are planning an extension, loft conversion, basement or other work near a shared structure or neighbouring building, the Party Wall etc. Act 1996 may be relevant. The important question is not the project label but whether the actual work falls within one of the statutory categories.
The Act is a civil framework for specified work to party structures, new walls at boundaries and certain excavations near neighbouring buildings. If required notice is not served, an adjoining owner can seek legal remedies. This guide explains the general process but does not determine whether the Act applies to an individual design.
This guide explains what the Act covers, the main notice and response routes, when surveyors may become involved and how the process sits alongside planning and Building Regulations. Property-specific legal or surveying advice may still be required.
A note on terminology: “Party wall agreement” is an informal search term. An adjoining owner may simply give written consent to a valid notice. Where a dispute arises and surveyor(s) are appointed under the Act, the formal determination is commonly called a Party Wall Award. Consent and an Award are not the same thing.
What Is a Party Wall? (And What Isn't One)
The Act recognises party walls and party structures, but it also covers some boundary-wall work and specified excavations near neighbouring buildings. The exact statutory definition matters more than whether a wall looks “shared” in everyday terms.
The Act uses different provisions for existing party walls/structures, new walls at the line of junction and qualifying excavation. Work can fall into more than one category, so the actual design needs to be checked before selecting a notice route.
Party wall (Section 20)
A wall forming part of a building that falls within the Act’s definition of a party wall. Work to it may require notice where the proposed operation is one covered by the Act.
Party fence wall (Section 20)
A wall that stands on the boundary but is not part of a building — a garden wall, for example. Not all boundary walls are party fence walls; it depends on ownership. A fence is not a party fence wall.
Party structure (Section 20)
A floor or ceiling that separates two properties — relevant for flats and maisonettes, where the floor of one flat is the ceiling of another. This catches a lot of flat owners who assume the Act only applies to houses.
Excavations near the boundary (Section 6)
Section 6 can apply to excavation within 3 metres where the proposed work goes deeper than the neighbour’s foundations, or within 6 metres where the statutory 45-degree depth test is met.
The Act applies in England and Wales. Scotland has different legislation — the Title Conditions (Scotland) Act 2003 and common law of the tenement. Northern Ireland has its own separate regime. If your property is in Scotland, this guide doesn't apply to you.
The Party Wall etc. Act is separate from planning permission and Building Regulations. More than one regime may apply to the same project, and compliance with one does not replace the others. Project responsibilities for planning, building control and party-wall advice should be identified separately.
When Does the Party Wall Act Apply?
The Act can apply to the categories below. These are general examples only; the exact design and statutory tests determine whether a notice is required.
Section 2 — Works to the party wall itself
- Cutting into the party wall to insert a beam or joist
- Raising the height of the party wall
- Underpinning the party wall
- Demolishing and rebuilding the party wall
- Making good defects in the party wall
- Inserting a damp-proof course into the party wall
Section 1 — Building a new wall on or at the boundary
- Building a new wall that will stand astride the boundary line
- Building a new wall up to the boundary line on your own land
Section 6 — Excavations near the boundary
- Excavating within 3 metres of the adjoining owner's building where the excavation goes below the level of their foundations
- Excavating within 6 metres of the adjoining owner's building where the excavation goes below a line drawn downward at 45° from the bottom of their foundations
The excavation rule catches more projects than people expect
Section 6 uses the relationship between the proposed excavation and the neighbouring building or structure. The 3-metre test also requires the excavation to go deeper than the neighbour’s foundations; a separate 6-metre test uses a 45-degree line from the bottom of those foundations. Distance from the boundary alone is not enough to decide whether Section 6 applies.
The Party Wall Notice Process: Step by Step
The process is more straightforward than most people expect. Here's how it works — and why the order matters.
- 1
Identify the relevant owners and work category
Establish which adjoining ownerships and buildings or structures are relevant to the proposed work, and whether the design potentially falls under Section 1, Section 2, Section 6 or more than one provision. Ownership and leasehold interests can affect who must receive notice, so obtain appropriate advice where title is not straightforward.
- 2
Serve the correct notice if the Act applies
The Building Owner is responsible for giving the required notice, although a properly authorised professional can prepare or serve it. GOV.UK guidance gives at least two months for Section 2 party-structure work and at least one month for Section 1 line-of-junction work or Section 6 excavation. The notice must describe the proposed work; excavation notices also require the specified plans and sections.
- 3
Record the adjoining owner's response
An adjoining owner may consent in writing or a dispute may arise. For Section 2 and Section 6 notices, no written consent within 14 days means a dispute is deemed to have arisen. Section 1 has different consequences depending on whether the proposed wall is astride or wholly on one side of the boundary.
- 4
Use the surveyor procedure where a dispute arises
Where the Act's dispute procedure applies, the owners can concur in one agreed surveyor or appoint separate surveyors. The appropriate appointment, scope, timing and reasonable fees depend on the actual dispute and work; this page does not set a fixed fee or duration.
- 5
Record condition where appropriate
A schedule of condition is commonly used by party-wall surveyors as evidence of the adjoining property’s pre-work condition. Whether it is prepared and what it records depends on the professional appointment and circumstances; it is not a substitute for the statutory notice or Award process.
- 6
Party Wall Award where required
If surveyor(s) are appointed under the dispute procedure, they can make an Award dealing with matters within their statutory jurisdiction, such as how relevant work is carried out and other necessary terms. The exact contents are project-specific.
- 7
Proceed in accordance with the applicable process
Work covered by the Act should proceed only after the relevant notice period and any required dispute or Award process have been dealt with, unless an adjoining owner has agreed in writing to an earlier start where the Act permits it. Planning, building control and other property rights remain separate.
Party Wall Process Points That Are Easy to Miss
These points are useful when planning the process, but they are general guidance rather than TCM case statistics or individual legal advice.
The Act is not a blanket neighbour veto
The Act gives adjoining owners procedural rights and provides a surveyor dispute-resolution mechanism for covered work. It does not replace planning law, private rights, restrictive covenants or the courts, and work should not start until the relevant statutory process has been followed.
Surveyor fees are not a fixed website tariff
If surveyors are appointed, their work and reasonable fees depend on the project and dispute. Cost responsibility can be addressed through the statutory process and Award. Obtain current professional fee information rather than assuming the Building Owner always pays a fixed amount.
Written consent is specific to the notified work
Consent under the Act records that the adjoining owner is content for the notified work to proceed under that route. It does not waive unrelated planning, nuisance, access, lease or building-control issues.
Flats and maisonettes can involve party structures
The Act's definition of party structure can include floors or other structures separating parts of buildings approached by separate staircases or entrances. Lease and landlord/freeholder consent can also raise separate questions.
Party wall, planning and Building Regulations are separate
A valid planning permission does not remove a Party Wall Act requirement, and a party-wall notice or Award does not grant planning or Building Regulations approval. Treat the regimes as separate project dependencies.
Do not assume a retrospective notice cures work already started
If covered work starts without the required notice, an adjoining owner can seek legal remedies. The Act does not provide a simple retrospective form that automatically regularises the position; obtain appropriate professional or legal advice.
A schedule of condition is evidence, not a substitute for the Act
Surveyors often record the adjoining property's condition before work starts so later damage questions can be compared with a baseline. The scope and evidential value depend on how it is prepared; it does not replace the notice or Award requirements.
Does My Project Need a Party Wall Notice?
Here's a quick reference for the most common residential projects in Hertfordshire and North London. These are general positions — the specific design of your project may change the answer. When in doubt, check with a surveyor before you start.
| Project type | Likely to need notice? | Which section? |
|---|---|---|
| Rear extension | Check excavation depth/geometry and any party-structure work | Section 6 and/or Section 2 may apply |
| Side extension | Check boundary-wall design, excavation and any existing party structure | Section 1, Section 6 and/or Section 2 may apply |
| Dormer loft conversion | Check whether the design cuts into, raises or otherwise works to a party structure | Section 2 may apply |
| Rooflight loft conversion | Check the actual structural work rather than assuming from the rooflight label | May be outside the Act if no covered party-structure work; verify design |
| Hip-to-gable conversion | Check whether the party structure is affected | Section 2 may apply |
| Basement conversion | Check Section 6 depth/geometry tests and any underpinning or party-structure work | Section 6 and/or Section 2 may apply |
| Garage conversion | Check structural interfaces and any new excavation | Depends on actual work |
| New build | Check line-of-junction work and excavation relative to neighbouring structures | Section 1 and/or Section 6 may apply |
| Internal refurbishment | Check whether any covered work to a party structure is proposed | Section 2 may apply in some cases |
If you are unsure whether the Act applies, use the current GOV.UK explanatory booklet and obtain appropriate party-wall professional advice. TCM can provide project drawings or construction information to an appointed adviser where that coordination forms part of the agreed scope.
Party Wall Costs: What to Budget
Party-wall professional costs depend on the notice response, appointments, project complexity and work required. There is no statutory fixed tariff and this page does not publish an unverified TCM or market price range.
Written consent
No Act-appointed surveyor required solely for consent
If valid notice is given and the adjoining owner provides written consent, the Act does not require surveyors simply to record that consent. You may still incur professional costs for checking applicability, preparing notices or other project advice.
Agreed surveyor
Current quote required
Where a dispute arises, both owners may concur in one agreed surveyor. Scope and fees depend on the project, professional appointment and work needed to make an Award.
Separate surveyors
Current quotes required
Each owner can appoint a surveyor where the statutory dispute procedure applies. Reasonable costs and their allocation are determined in the context of the Act and Award; do not assume a fixed total or automatic fee allocation from this website.
Party-wall professional costs are separate from the building work itself and should be obtained from the relevant adviser(s). For construction budgeting, see our House Extension Cost Guide and Loft Conversion Cost Guide.
How TCM Manages Party Wall Matters
TCM can identify where a building design appears to create a party-wall interface and can coordinate project information with the Building Owner's appointed party-wall professional where this is included in the agreed scope.
TCM is not presented on this page as the statutory surveyor or legal adviser, and the current Site Facts/Experience registers do not approve a universal TCM notice-preparation or notice-serving service. The Building Owner remains responsible for ensuring the Act is complied with and can authorise an appropriate adviser to prepare or serve notices.
Where a dispute arises, the surveyor appointment and Award process belongs to the statutory party-wall route. TCM can provide drawings, construction information and programme details needed by the appointed professionals where agreed.
Planning permission, Building Regulations and party-wall matters should each be programmed as separate dependencies. Their timing depends on the project; this page does not promise that they can always run in parallel or guarantee a neighbour response.
A note on neighbour communication
Informal communication with an adjoining owner can help them understand the proposed project, but it does not replace a statutory notice where the Act requires one. Keep the legal process and ordinary neighbour communication distinct.
Related Planning Guides
The party wall process sits alongside planning permission and Building Regulations as the three regulatory frameworks that apply to most extension and conversion projects. These guides cover the adjacent topics.
Party Wall Agreement: Homeowner Guide
The detailed technical guide — surveyor selection, award contents, and dispute resolution.
House Extension Planning Permission Guide
PD limits for extensions, the Prior Approval route, and when a full application is needed.
Permitted Development Rights Guide
The national permitted-development framework and the property-specific checks that affect it.
Building Regulations for Extensions & Conversions
What Building Regulations cover and how the approval process works.
Frequently Asked Questions
People often use 'party wall agreement' as a general term for written consent or for a Party Wall Award. Under the Party Wall etc. Act 1996, an adjoining owner can consent in writing to notified work. If a dispute arises under the Act, the appointed surveyor or surveyors can make a Party Wall Award setting out how the relevant work may proceed. Consent and an Award are not the same thing.
Planning an Extension or Loft Conversion?
Contact TCM to discuss the proposed building work and project information available. If party-wall advice is required, use an appropriate party-wall professional; TCM can coordinate relevant drawings or construction information where that forms part of the agreed project scope.