The Party Wall etc. Act 1996 governs construction work that affects shared walls, boundaries, or foundations close to a neighbour's land. If you're planning a rear extension, loft conversion, or excavation near a boundary, you'll likely need to serve formal notice — and may end up with a party wall award. This guide explains what a party wall agreement must include, when you need one, and whether you can use a DIY template.
What Is a Party Wall Agreement?
The term "party wall agreement" is commonly used, but technically there are two separate documents:
- Party wall notice — the formal written notice you serve on your neighbour before starting notifiable works.
- Party wall award — the legally binding document drawn up by surveyors if a dispute arises (or if the neighbour doesn't consent).
Both are governed by the Party Wall etc. Act 1996, which applies in England and Wales only. Scotland and Northern Ireland have separate legislation. For a full overview of the Act and how it applies to different project types, see our party wall agreement UK guide.
When Is a Party Wall Notice Required?
The Act covers three categories of notifiable works:
| Section | Type of Work | Notice Type |
|---|---|---|
| Section 2 | Works to an existing party structure (wall, floor, or partition shared between two properties) | Party Structure Notice |
| Section 1 | Building a new wall on or at the boundary line | Line of Junction Notice |
| Section 6 | Excavation within 3 metres (or 6 metres for deeper foundations) of a neighbouring building | Three Metre / Six Metre Notice |
Common triggers include loft conversions, rear extensions involving RSJ beams in a party wall, underpinning, and basement excavations. If you're unsure whether notice is required, a party wall surveyor can assess your plans — an initial consultation typically costs £150–£300. See also our guide on party wall loft conversion requirements for how the Act applies specifically to loft projects.
The Three Notice Types
Party Structure Notice (Section 2)
Required when you intend to cut into, raise, underpin, or otherwise alter a party wall. It must be served at least 2 months before works begin and must describe the intended works in sufficient detail for the adjoining owner to understand what is proposed.
Line of Junction Notice (Section 1)
Required when you plan to build a new wall at or astride the boundary. Serve at least 1 month before work starts.
Three Metre and Six Metre Notice (Section 6)
Required when excavating within 3 metres of a neighbouring structure to a depth greater than their foundations, or within 6 metres if the new foundations would intersect a 45-degree line drawn from the base of the neighbour's foundations. Serve at least 1 month before work starts.
What a Valid Party Wall Notice Must Include
A valid notice must contain the following information:
- Your name and address (the building owner)
- The address of the property where work is being carried out
- A description of the proposed works
- The proposed start date
- A clear statement that the notice is served under the Party Wall etc. Act 1996
- Drawings and plans where the works are complex or structural
Send the notice by hand or recorded delivery and keep a copy. Your neighbour (the adjoining owner) then has 14 days to respond in writing.
What Happens If the Neighbour Consents?
If the adjoining owner gives written consent within 14 days, no surveyor is needed and work can proceed on the agreed start date. Keep the consent letter safely with your project records.
What Happens If the Neighbour Refuses or Doesn't Respond?
Failure to respond within 14 days is treated as a deemed dispute under the Act. A refusal triggers the same process. Both scenarios require appointment of party wall surveyors. You have two routes:
- Agreed surveyor — a single surveyor appointed by both parties jointly. Typically costs £700–£1,200 and is the quicker, cheaper route.
- Two surveyors — each party appoints their own. If they cannot agree, they appoint a Third Surveyor to adjudicate. Total costs typically range from £1,500–£4,000+.
Under Section 10(13) of the Act, the building owner pays both surveyors' reasonable fees, unless the adjoining owner has requested specific works for their own benefit. For a detailed breakdown of who pays what, see our party wall surveyor fees guide.
What a Party Wall Award Must Include
A party wall award is a legally binding document. For it to be valid and enforceable, it must contain the following elements:
| Element | Detail |
|---|---|
| Description of works | Precise detail of all notifiable works covered by the award |
| Working hours | Typically 08:00–17:00 Monday to Friday; restricted Saturday; no Sunday |
| Surveyor access rights | Right to inspect the adjoining property on reasonable notice |
| Schedule of condition | Photographic and written record of the adjoining property before works begin |
| Security for expenses | May require the building owner to provide a bond against potential damage |
| Dispute resolution | Reference to Third Surveyor if the two appointed surveyors disagree |
| Time limits | Works must commence within 12 months of the date of the award |
The schedule of condition is one of the most important components. It documents the pre-existing state of the neighbour's property so that any damage caused during works can be properly attributed — and fairly resolved.
DIY Template vs Appointing a Surveyor
DIY notice templates are available online and are legally valid for the notice stage of straightforward projects. However, they carry risks:
- An incorrectly completed notice can be invalid, meaning the statutory clock never starts.
- A template cannot help you draft an award if a dispute arises — that requires a qualified surveyor.
- If works are structural or complex, vague descriptions in the notice can lead to scope disputes later.
For simple jobs (a standard rear single-storey extension on a clearly defined party wall), a well-drafted template may suffice for serving notice. For anything involving underpinning, deep excavations, or significant structural alteration to a shared wall, appoint a RICS-registered party wall surveyor from the outset. If your neighbour is being uncooperative, see our guide on what to do when a neighbour refuses the party wall act.
Typical Surveyor Fees
| Route | Typical Cost |
|---|---|
| Agreed surveyor | £700–£1,200 |
| Two-surveyor route (building owner's surveyor) | £800–£2,000 |
| Two-surveyor route (adjoining owner's surveyor — also paid by building owner) | £700–£2,000 |
| Third Surveyor appointment | £500–£1,500 additional |
Enforcement and Time Limits
- Party Structure Notices must be served at least 2 months before works begin; Line of Junction and Section 6 notices require at least 1 month.
- Works must commence within 12 months of the date of the award. If they don't, new notices may be required.
- A party wall award can be enforced through the county court. Damaging an adjoining property without following the Act can result in an injunction and liability for damages.
- Either party has 14 days from the date of the award to appeal to the county court if they consider it incorrect in law or procedure. See our guide on how to challenge a party wall award for the full process.
Understanding the Party Wall etc. Act 1996 before you start building is essential — failing to serve proper notices can result in an injunction halting your works entirely. Whether you use a DIY template or appoint a surveyor, keep every document, ensure notices are served well in advance, and insist on a thorough schedule of condition before a single tool is raised.
Related Guides
- Party Wall Agreement UK Guide — full Act overview including how the three sections apply to different project types
- Party Wall Agreement: Full Step-by-Step Guide for Homeowners — notice timelines, consent vs dissent, award drafting, and surveyor costs
- Single Storey Rear Extension: Design, Cost and Planning Guide — the most common domestic project to trigger party wall notices; includes planning, design, and build cost guidance
- Party Wall Surveyor Fees: Who Pays? — detailed breakdown of surveyor costs and the statutory position on who bears them