Party Wall Act Explained

The Party Wall etc. Act 1996 requires you to serve formal notice on your neighbour before building on or near a shared boundary, excavating within 3 metres of their structure, or carrying out work directly to a party wall. The Act is completely separate from planning permission — having one doesn't exempt you from the other. Your neighbour cannot use the Act to prevent your work, but they can require a surveyor (at your expense) to set conditions protecting their property. This guide explains when you need to serve notice, the different notice types, and how disputes are resolved.

What Is the Party Wall Act?

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Key Party Wall Act Facts (England & Wales)

• Applies to: work on party walls, boundary walls, and excavation near neighbours
• 3m rule: notice required for excavation within 3m of neighbour's structure
• 6m rule: notice required for deep excavation within 6m of neighbour's foundations
• Notice period: minimum 1-2 months before work starts
• Surveyor costs: £700-£1,500 per neighbour (paid by building owner)
• The Act does NOT apply in Scotland (different shared wall laws)

What is a party wall? A party wall is a wall shared by two properties — typically the dividing wall between semi-detached or terraced houses. It also includes walls on the boundary line between two properties (even if wholly on one side), and certain boundary structures like garden walls built on the boundary line.

The Party Wall etc. Act 1996 provides a framework for:

• Preventing and resolving disputes about party walls
• Boundary walls
• Excavations near neighbouring buildings

It gives you the right to carry out certain works, while protecting your neighbour's interests.

⚠️ Important: The Party Wall Act is separate from planning permission. You may need both. Getting planning approval doesn't remove your Party Wall obligations.

When Does the Act Apply?

You need to serve notice under the Act for:

1. Work on a Party Wall (Section 2)

A party wall is a wall that:

• Stands on the boundary of two properties and is used by both
• Stands on the boundary and separates buildings owned by different people

Work includes:

• Cutting into the wall
• Raising or lowering the wall
• Demolishing and rebuilding
• Underpinning
• Inserting a damp proof course
• Exposing the wall (e.g., removing chimney breast)

2. Building on the Boundary (Section 1)

Building a new wall on or astride the boundary between properties.

3. Excavating Near Neighbouring Buildings (Section 6)

Excavating within:

• 3 metres of a neighbouring building, if the excavation will go below the neighbour's foundations
• 6 metres of a neighbouring building, if the excavation will cut a 45-degree line from the bottom of their foundations

This commonly applies to:

• Basement extensions
• Deep foundations
• Swimming pools
• Underpinning

What Notices Do You Need to Serve?

How to Serve Notice

Step 1: Prepare the Notice

Your notice must include:

• Your name and address
• The building owner's name and address
• A description of the proposed works
• The proposed start date
• Statement that it's served under the Party Wall etc. Act 1996

Step 2: Serve on All Adjoining Owners

"Adjoining owner" means anyone with an interest in the neighbouring property, including:

• Freeholders
• Leaseholders (with 1+ years remaining)
• Tenants (in some cases)

Step 3: Wait for Response

Your neighbour has 14 days to respond. They can:

Consent — You can proceed (keep written evidence)

Dissent (or no response) — A dispute is deemed to exist, and you need to appoint surveyors

What If There's a Dispute?

When a dispute exists, you must appoint surveyors to agree a Party Wall Award.

Option 1: Agreed Surveyor

Both parties agree on one surveyor to act impartially for both.

Pros: Cheaper, faster Cons: Some prefer independent representation

Option 2: Two Surveyors

Each party appoints their own surveyor. The two surveyors then agree the Award (or appoint a Third Surveyor to decide disputes between them).

Pros: Each party has representation Cons: More expensive, slower

The Party Wall Award

The surveyors prepare an Award that includes:

• What work can be done
• How and when it can be done
• Condition schedules (photos/records of neighbour's property)
• Access arrangements
• What happens if damage occurs
• Who pays the costs

The Award is legally binding and can be enforced through the courts.

Who Pays?

General Rule

The building owner (you, if you're doing the work) pays:

• Notice costs
• Surveyor fees (yours and your neighbour's reasonable fees)
• Award costs
• Making good any damage

Exceptions

Your neighbour may share costs if:

• They benefit from the work (e.g., shared underpinning)
• They request additional work
• They cause unreasonable delay

What If I Don't Serve Notice?

If you carry out work without serving proper notice:

• Your neighbour can seek an injunction to stop work
• They can require you to undo work already done
• You may be liable for damages
• Disputes become more expensive to resolve
• It can complicate future property sales

Never skip the notice — even if you think your neighbour won't mind. Get their written consent at minimum.

Common Scenarios

Loft Conversion

May require notice if:

• Cutting into a party wall (e.g., for steel beams)
• Raising the party wall
• Work affects shared chimney stacks

Rear Extension

May require notice if:

• Building on or near the boundary
• Foundations within 3m/6m of neighbour's building
• Attaching to the party wall

Basement Extension

Almost always requires notice:

• Excavation within 6m at 45-degree angle
• Underpinning likely to affect party wall
• Often the most complex Party Wall scenarios

Garden Wall

Depends on ownership:

• If it's a party fence wall (on the boundary, used by both): Act applies
• If it's wholly on your land: Act doesn't apply

Party Wall Surveyors

Who Can Be a Party Wall Surveyor?

There's no legal qualification requirement. However, you should use someone experienced — typically:

• Chartered surveyors (RICS)
• Architects
• Structural engineers
• Specialist party wall surveyors

How Much Do They Cost?

Typical fees (2026):

Your neighbour's reasonable surveyor fees are usually paid by you.

Key Takeaways

1. The Act is separate from planning — You may need both
2. Serve notice early — 1-2 months before starting
3. Get written consent or agreement — Verbal agreements aren't enough
4. You pay surveyor costs — Budget for this in your project
5. Don't skip notices — Even friendly neighbours may sell, and the next owner could pursue you
6. Basements are complex — Allow extra time and budget

Related Guides

• Permitted Development Rights Explained
• Planning Permission Process: Complete Guide
• My Neighbour Is Building an Extension
• Someone Is Building Too Close to My Boundary
• Do I Need Planning Permission for a Conservatory?
• Do I Need Planning Permission for a Garage?
• How Much Does Planning Permission Cost?
• Planning Enforcement: When Rules Are Broken

This guide is for general information only and does not constitute legal advice. Party wall matters can be complex. For advice specific to your situation, consult a qualified party wall surveyor.

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Frequently Asked Questions

What is the Party Wall Act?

The Party Wall etc. Act 1996 gives you rights and obligations when building on or near a shared boundary. It requires notice before certain works, provides dispute resolution through surveyors, and protects neighbouring property through schedule of condition reports.

When do I need to serve a party wall notice?

You must serve notice for: work directly on a party wall or boundary, new building within 3m of a neighbour's structure (if excavating below their foundations), or within 6m if excavating to a depth that intersects a 45-degree line from the bottom of their foundations.

How much does a party wall surveyor cost?

Party wall surveyor fees typically range from £700-£1,500 per neighbour for straightforward cases. Complex disputes can cost significantly more. The building owner (the one doing the work) usually pays all surveyor fees.

What happens if my neighbour doesn't respond to a party wall notice?

If your neighbour doesn't respond within 14 days, a dispute is deemed to have arisen. You then appoint a party wall surveyor to prepare a Party Wall Award setting out the terms, timing, and conditions for the work.

Can my neighbour stop my extension using the Party Wall Act?

No. The Party Wall Act cannot prevent work — it provides a framework for managing the process and protecting your neighbour's property. Your neighbour can request a surveyor and conditions, but cannot veto the work.

Is the Party Wall Act the same as planning permission?

No — they are completely separate legal requirements. Having planning permission doesn't exempt you from party wall obligations, and a party wall agreement doesn't grant planning permission. You may need both.

Browse Planning by Region

While the Party Wall Act applies uniformly across England and Wales, the types of disputes and construction patterns vary by region. Scotland has different shared wall rules entirely.

• Planning in London — Highest volume of party wall disputes, basement excavation hotspot
• Planning in the South East — Terraced housing concentrations, loft conversion party wall issues
• Planning in the North West — Terraced housing stock, extension boom in suburban areas
• Planning in Scotland — Different legal framework for shared walls (not covered by the Party Wall Act)

Browse all regions →