Counter Notice Under the Party Wall Act: When and How to Serve One
A counter notice under Section 4 of the Party Wall etc. Act 1996 allows an adjoining owner to require the building owner to carry out additional works to a party structure beyond what was originally proposed. Counter notices can only be served in response to a Section 1 notice (new wall on the boundary) or a Section 6 notice (excavation near foundations). They cannot be served in response to a Section 2 notice (works to an existing party wall). The counter notice must be served within 14 days of receiving the original notice. If the building owner does not consent within 14 days, a dispute is deemed to have arisen under Section 5, triggering the surveyor appointment process under Section 10.
Your neighbour has just served a party wall notice. They are planning to build a new wall on the boundary, or to excavate near your foundations. You review the plans and realise: if they are doing this work anyway, this is the ideal moment to strengthen the structure for your own future needs.
That is exactly what a counter notice is for. It is one of the least understood provisions in the Party Wall etc. Act 1996, and one of the most useful. Most homeowners do not know they have this right until the 14-day window to exercise it has already closed.
This guide explains what a counter notice is, when it applies (and critically, when it does not), how to serve one correctly, what happens next, and the mistakes that cost adjoining owners the opportunity.
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Ask Us on WhatsApp FreeWhat Is a Counter Notice Under Section 4?
The legal basis is straightforward. Section 4(1) provides that within the period prescribed for responding to a notice under Section 1 (line of junction) or Section 6 (excavation), the adjoining owner may serve on the building owner a notice requiring them to build a party wall or party fence wall to a specification that goes beyond the building owner’s original proposal. This can include requiring a stronger wall, a higher wall, deeper foundations, or features that make the structure suitable for the adjoining owner’s future building work.
The entity relationship matters here. A party wall notice is served by the building owner to initiate works. A counter notice is the adjoining owner’s response, requesting additional works. If the building owner does not consent to the counter notice within 14 days, a dispute arises under Section 5. That dispute is resolved by party wall surveyors appointed under Section 10, who produce a binding party wall award determining what works proceed and on what terms.
When You Can and Cannot Serve a Counter Notice
| Notice Type | Counter Notice Allowed? | Why |
|---|---|---|
| Section 1 (line of junction, new wall on boundary) | Yes | The adjoining owner can require the new wall to be built to a higher standard, with deeper foundations, or as a party fence wall instead of a boundary wall |
| Section 6 (excavation near foundations) | Yes | The adjoining owner can require the building owner to underpin or strengthen their foundations while excavation is taking place |
| Section 2 (party structure notice, works to existing wall) | No | Section 4 does not apply to Section 2 notices. The adjoining owner’s recourse is to dissent and have the works governed by an award under Section 10 |
Related: Line of Junction Notice Guide
Five Reasons Adjoining Owners Serve Counter Notices
Requiring a party fence wall instead of a boundary wall
Under Section 1, a building owner may propose a simple boundary wall built entirely on their own land. The adjoining owner can serve a counter notice requiring a party fence wall instead, which straddles the boundary and provides structural benefit to both properties. This is common in London’s terraced streets where a shared wall is more useful than a one-sided boundary structure.
Requiring stronger or higher construction
The building owner may propose a single-skin 100mm blockwork garden wall. The adjoining owner, planning their own future extension, can counter-notice to require 225mm solid brick construction at a height suitable for supporting future building work. The additional cost is shared proportionally, but the saving compared to demolishing the original wall and rebuilding later is significant.
Requiring foundations suitable for future building
This is one of the most financially valuable uses of a counter notice. If your neighbour is laying foundations for their new boundary wall, you can require those foundations to be built to a depth and specification capable of bearing structural loads for your own future project. Getting this right at the outset can save thousands by avoiding the need to underpin or replace foundations later.
Requiring weatherproofing or protective features
Where the building owner’s proposed wall will affect your property’s exposure to weather, dampness, or drainage, a counter notice can require specific weatherproofing features: damp-proof courses, flashing, rendering, or drainage channels that protect your side of the structure.
Requiring underpinning during excavation
When your neighbour serves a Section 6 excavation notice, a counter notice allows you to require them to underpin or otherwise protect your foundations while the excavation is taking place. This is particularly relevant in London where Victorian terraces often have shallow, shared foundations and excavation on one side can directly affect the other.
Related: Section 6 Excavation Notices
How to Serve a Counter Notice Correctly
- Confirm the notice type. Check that you received a Section 1 or Section 6 notice. If it is a Section 2 notice, a counter notice does not apply. Your recourse is to dissent and proceed through the Section 10 surveyor process.
- Check the deadline. Count 14 days from the date you received the original notice. Not from the date on the notice itself. If in doubt about the exact date, serve the counter notice immediately rather than risk missing the window.
- Specify the additional works precisely. Describe exactly what you require: wall thickness, foundation depth, material specification, height, weatherproofing details. “Stronger construction” is vague and challengeable. “225mm solid brick with concrete foundations to 1,200mm depth, capable of bearing structural loads” is specific and enforceable.
- Serve the counter notice in writing on the building owner. Deliver by hand with a signed receipt, by recorded delivery post, or by email if the building owner has agreed to accept electronic service. Keep proof of the date and method of service.
- Consider instructing a surveyor. A party wall surveyor can draft the counter notice, ensure the technical specification is appropriate, and manage the follow-up process if the building owner does not consent. For anything beyond the simplest counter notice, professional drafting is worth the cost.
What Happens After the Counter Notice Is Served
| Building Owner Response | What Happens |
|---|---|
| Consents in writing within 14 days | Counter notice works are agreed. Building owner carries them out alongside their own works. Adjoining owner pays a proportionate share of the additional cost. |
| Does not respond within 14 days | Dispute deemed to arise under Section 5. Surveyors appointed under Section 10. The surveyors determine the counter notice works in the party wall award. |
| Actively rejects the counter notice | Same as non-response. Dispute arises. Section 10 process resolves it. The surveyors decide whether the counter notice requirements are reasonable. |
The surveyors’ role is to determine whether the counter notice requirements are reasonable and proportionate. Unreasonable or excessive requirements can be modified or rejected by the surveyors in the award. That is why specificity and proportionality in the counter notice matter so much.
Related: Party Wall Award Document Guide
Who Pays for Counter Notice Works
How the cost split works in practice
If the adjoining owner counter-notices to require a stronger wall that benefits both properties equally, the cost of upgrading from the building owner’s original specification to the counter-noticed specification is typically split 50/50. If the counter notice benefits only the adjoining owner, they bear the full additional cost. If the upgraded wall primarily benefits the building owner (for example, by providing better structural support for their own works), the building owner bears most of the cost.
| Scenario | Who Benefits | Typical Cost Split |
|---|---|---|
| Party fence wall instead of boundary wall | Both equally | 50/50 on the additional cost of straddling the boundary |
| Deeper foundations for adjoining owner’s future extension | Adjoining owner primarily | Adjoining owner pays the full cost of the deeper foundations |
| Stronger wall benefiting both structures | Both equally | 50/50 on the difference between original and upgraded specification |
| Weatherproofing to protect adjoining property | Adjoining owner primarily | Adjoining owner pays the weatherproofing cost |
| Underpinning during Section 6 excavation | Both (building owner’s excavation created the need) | Building owner typically bears the majority of the underpinning cost |
The overall party wall surveyor fees remain the building owner’s responsibility under Section 10(13). The cost split applies only to the physical works themselves, not to the surveyor’s professional fees.
Common Counter Notice Mistakes
Missing the 14-day deadline
The most common and most costly mistake. The 14-day window starts from the date you receive the original notice, not from the date printed on it. If a notice arrives by post on a Wednesday, day one is Thursday. By the following Wednesday at the latest, the counter notice must be served. Miss it and the right is gone. There is no provision in the Act for late counter notices.
Serving a counter notice against a Section 2 notice
Section 4 counter notices apply only to Section 1 and Section 6 notices. If your neighbour has served a Section 2 party structure notice (works to an existing party wall), a counter notice is not available. Your options are to consent, dissent, or do nothing (deemed dissent). Many homeowners confuse the notice types and attempt to counter-notice a Section 2 notice, wasting time and creating confusion in the process.
Being too vague in the specification
A counter notice that says “I require a stronger wall” is not enforceable in any meaningful way. What type of construction? What thickness? What foundation depth? What materials? The surveyor determining the counter notice needs concrete specifications to work with. Vague counter notices are either rejected outright or interpreted in ways the adjoining owner did not intend.
Requesting unreasonable or disproportionate works
A counter notice must be proportionate to the original works and the genuine needs of the adjoining owner’s property. Requesting a 3-metre-high engineered retaining wall when the building owner proposed a simple garden boundary wall is unlikely to be upheld by the surveyors. Proportionality is the test.
Serving a counter notice with no intention to fund the additional cost
If the counter notice works benefit the adjoining owner’s property, the adjoining owner must pay a fair proportion. Serving a counter notice to inflate the building owner’s costs, with no genuine intention of using the additional works, is both strategically unwise and liable to be rejected by the surveyors as unreasonable.
If You Are the Building Owner Who Received a Counter Notice
Your three options as a building owner who has received a counter notice:
- Consent within 14 days. You agree to carry out the additional works. The adjoining owner pays their proportionate share. The project proceeds with the expanded scope. This is often the fastest route.
- Negotiate. Discuss the counter notice with the adjoining owner or their surveyor. Agree a modified specification that satisfies both parties. This keeps the matter out of formal dispute resolution.
- Do nothing or reject. If you do not consent within 14 days, a dispute is deemed to arise under Section 5. Surveyors are appointed. The surveyors determine what is reasonable and include the appropriate provisions in the party wall award. Your project still proceeds.
Related: Building Owner Survey Service
Three Scenarios
The following are representative illustrative scenarios based on common London counter notice situations. Not named clients. Costs are approximate 2026 indicative figures.
Section 1 Notice: Adjoining Owner Secures Structural Foundations for Future Extension
A building owner in Clapham served a Section 1 notice proposing a single-skin 100mm blockwork garden wall on the boundary line. The adjoining owner, planning a rear extension within the next two years, served a counter notice within 10 days requiring the wall to be built as 225mm solid brick with concrete foundations to 1,200mm depth, suitable for bearing structural loads.
The building owner initially objected to the additional cost. The surveyors determined that the counter notice was reasonable given the adjoining owner’s documented building plans. The adjoining owner paid the full additional cost of the deeper foundations and thicker wall, approximately £4,200 above the building owner’s original specification. The building owner paid for the original wall specification as planned.
The saving for the adjoining owner: avoiding demolition of the original wall and separate foundation work later, which would have cost an estimated £14,000 to £18,000 as a standalone project.
Representative illustrative scenario. Not a named client case.
Section 6 Notice: Counter Notice for Foundation Protection During Basement Dig
A building owner in Battersea served a Section 6 notice for a basement excavation within 3 metres of the neighbouring Victorian terrace. The adjoining owner’s surveyor identified that the neighbouring property had shallow foundations at approximately 400mm depth with no structural separation from the building owner’s side.
The adjoining owner served a counter notice requiring the building owner to underpin the shared foundations to 1,500mm depth using a specified sequence, with monitoring during the process. The building owner did not respond within 14 days. A dispute arose. The surveyors upheld the counter notice requirements in the party wall award, with the building owner bearing the full underpinning cost since the excavation created the structural risk.
The underpinning specification in the award protected both properties throughout the basement construction. No structural movement was recorded.
Representative illustrative scenario. Not a named client case.
Counter Notice Served Too Late: 14-Day Deadline Missed
An adjoining owner in Hackney received a Section 1 notice for a new boundary wall. They spent three weeks researching their options and consulting with their architect about future building plans. By the time they decided to serve a counter notice requiring deeper foundations, 22 days had passed since they received the original notice.
The surveyor confirmed that the 14-day deadline had expired. The counter notice was invalid. The building owner proceeded with the original specification: a lightweight boundary wall on shallow foundations. When the adjoining owner later started their own extension, they had to demolish the boundary wall, excavate new foundations, and rebuild at their own cost. The standalone project cost approximately £16,000, which could have been significantly reduced had the counter notice been served on time.
Representative illustrative scenario. Not a named client case.
Key Takeaways
- ✓A counter notice under Section 4 lets an adjoining owner require additional works to a party structure beyond the building owner’s original proposal
- ✓Counter notices apply only to Section 1 (line of junction) and Section 6 (excavation) notices. They cannot be served against Section 2 notices.
- ✓The 14-day deadline from receipt of the original notice is absolute. Miss it and the right is gone.
- ✓The building owner executes the counter notice works. The adjoining owner pays a fair proportion of the cost where the works benefit their property.
- ✓Be specific. “Stronger wall” is vague and challengeable. “225mm brick with foundations to 1,200mm depth” is enforceable.
- ✓A counter notice is not a veto. The building owner’s project proceeds regardless. The counter notice adds requirements, it does not block the works.
- ✓If the building owner does not consent within 14 days, the dispute is resolved by surveyors under Section 10. The surveyors determine what is reasonable.
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Ask Us on WhatsApp FreeCounter Notice Party Wall Act: Frequently Asked Questions
A counter notice is a formal written response served by an adjoining owner on the building owner under Section 4 of the Party Wall etc. Act 1996. It requires the building owner to carry out additional works to the party structure beyond what they originally proposed. Counter notices can only be served in response to Section 1 notices (new wall on the boundary) or Section 6 notices (excavation near foundations). They must be served within 14 days of receiving the original notice.
No. Section 4 counter notices apply only to Section 1 (line of junction) and Section 6 (excavation) notices. If your neighbour has served a Section 2 notice for works to an existing party wall, your options are to consent, dissent, or stay silent (deemed dissent after 14 days). You cannot serve a counter notice requiring additional works to an existing party wall structure.
You must serve the counter notice within 14 days of receiving the original party wall notice. This deadline is absolute and runs from the date of receipt, not the date printed on the notice. There is no provision in the Act for late counter notices. If you miss the deadline, the right is lost and cannot be recovered.
The building owner must execute the additional works. However, the adjoining owner must pay a fair proportion of the cost to the extent that the works benefit the adjoining owner’s property. If the counter notice works benefit both properties equally, the additional cost is typically split 50/50. If they benefit only the adjoining owner, the adjoining owner bears the full additional cost. The party wall surveyors determine the fair proportion if the parties cannot agree.
If the building owner does not consent to the counter notice within 14 days of receiving it, a dispute is deemed to have arisen under Section 5 of the Act. The surveyor appointment process under Section 10 then begins. The appointed surveyors determine whether the counter notice requirements are reasonable, and include appropriate provisions in the party wall award. The building owner’s project proceeds, but the award governs how it proceeds.
No. A counter notice is not a veto and does not block or cancel the building owner’s project. It adds requirements. Even if the surveyors uphold every element of the counter notice, the building owner’s original works proceed alongside the additional works. The Party Wall etc. Act 1996 is an enabling act. It facilitates works subject to proper protections. It does not give either party the power to cancel a lawful project.
The Act does not require a surveyor to serve a counter notice. You can draft and serve one yourself. However, the counter notice must specify the additional works with enough technical detail to be enforceable. For anything beyond the simplest request, a party wall surveyor can draft the counter notice, ensure the specification is proportionate and technically sound, and manage the follow-up process if the building owner does not consent. The cost of professional drafting is usually small compared to the risk of a vague or invalid counter notice.
Yes. A counter notice and a dissent are two separate actions. Dissenting from the original notice means you object to the proposed works and want them governed by a party wall award. Serving a counter notice means you want additional works carried out as part of the project. You can do both simultaneously. You can also consent to the original works while serving a counter notice requiring additional works on top of what was proposed.