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Understand Your Party Wall Responsibilities Before Building
Our party wall assessment of proposals advice reviews your drawings to establish whether your planned works fall under the Party Wall etc. Act 1996 or not.
This party wall proposal assessment can help you identify which parts of your project may require formal notices and what needs to happen before construction starts.
You don't have to wait until your builder is ready to begin.
Start today to avoid delays!
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What Are Party Wall Matters?
Party wall matters are building works covered by the Party Wall etc. Act 1996.
The Act covers three main situations:
The Act covers three main situations:
- New walls at the boundary (Section 1): If you're planning to build a new wall on the line of junction between your property and your neighbour's.
- Work to an existing shared wall (Section 2): Certain structural alterations like cutting into a party wall to insert a steel beam can fall within this section.
- Excavation near neighbouring foundations (Section 6): Excavation within specified distances of a neighbouring building may require notice.
However, planning permission and building regulations approval do not automatically deal with your obligations under the Party Wall Act.
What Do We Need From You?
- Architectural drawings and proposed plans.
- Structural engineer's drawings or calculations, if available.
- The property address.
- A brief description of the planned works.
- Your estimated construction start date or programme.
If your drawings are still being developed, get in touch to discuss what information is available. You may not need to wait until every detail has been finalised to start identifying potential party wall requirements.
Reviewing the Type of Proposed Work
Identifying Works That Trigger the Party Wall Act
Our surveyors begin by carefully assessing the nature of your proposed construction works.
We review whether your project includes:
Loft Conversions
Basement Excavations
Boundary Wall Construction
Rear Extensions
Internal Structural Alterations
Excavation Foundations
Side Return Extensions
Chimney Breast Removals
These types of projects frequently affect:
Shared Party Walls
Boundary Lines
Adjoining Structures
Neighbouring Foundations
If your works fall within the scope of the Act, we will advise exactly which notices must be served and the legal timelines you must follow.
This early assessment helps to prevent:
- Invalid notices
- Construction delays
- Legal injunctions
- Unnecessary neighbour disputes
How a Party Wall Proposal Assessment Works?
Our party wall proposal assessment follows a practical process to establish which parts of your project may fall within the Act.
- You send us your drawings and project details
- We identify potentially notifiable works
- We check the relevant sections of the Act
- We assess potential effects on neighbouring properties
- We explain the likely notice requirements, applicable timescales and matters
We also assess:
- Excavation depth
- Proximity to neighbouring buildings
- Existing structural conditions
- Access requirements
- Risks of cracking or settlement
By identifying these risks early, we can recommend the appropriate protections needed to safeguard both parties.
Common Party Wall Matters by Project Type
Different building projects raise different questions under the Act. Here are some common examples we can assess when reviewing your drawings.
Party Wall Loft Conversion
A party wall loft conversion may require notice where new steel beams or purlins are designed to bear into an existing shared wall.
Practical tip: Include the structural engineer's beam layout and bearing details in your drawings so the proposed alterations can be assessed accurately.
A party wall loft conversion may require notice where new steel beams or purlins are designed to bear into an existing shared wall.
Practical tip: Include the structural engineer's beam layout and bearing details in your drawings so the proposed alterations can be assessed accurately.
Party Wall Basement Excavation
A party wall basement excavation can raise significant questions about the depth and position of new excavation relative to neighbouring foundations.
Section 6 applies where excavation is within 3 metres of a neighbouring building and extends below the bottom of its foundations, or within 6 metres where it meets the statutory 45-degree test.
Underpinning or other qualifying work to a shared wall may also fall under Section 2. Potential concerns include ground movement, settlement and construction vibration.
Practical tip: Provide excavation sections showing proposed depths and information about neighbouring foundations.
A party wall basement excavation can raise significant questions about the depth and position of new excavation relative to neighbouring foundations.
Section 6 applies where excavation is within 3 metres of a neighbouring building and extends below the bottom of its foundations, or within 6 metres where it meets the statutory 45-degree test.
Underpinning or other qualifying work to a shared wall may also fall under Section 2. Potential concerns include ground movement, settlement and construction vibration.
Practical tip: Provide excavation sections showing proposed depths and information about neighbouring foundations.
Party Wall Rear Extension
A party wall rear extension may involve more than one part of the Act. Building a new wall on the line of junction can fall under Section 1 and foundations close to a neighbouring building may trigger Section 6.
Practical tip: Share the site plan and foundation drawings, not just the proposed rear elevation.
A party wall rear extension may involve more than one part of the Act. Building a new wall on the line of junction can fall under Section 1 and foundations close to a neighbouring building may trigger Section 6.
Practical tip: Share the site plan and foundation drawings, not just the proposed rear elevation.
Removing a Chimney Breast on a Party Wall
Removing chimney breast party wall works need careful assessment where a chimney breast forms part of a shared wall. Cutting away a breast may fall under Section 2 and can affect support for the neighbouring owner's chimney or the remaining wall structure.
Practical tip: Include the structural engineer's proposals for supporting the remaining masonry and any associated steelwork.
Removing chimney breast party wall works need careful assessment where a chimney breast forms part of a shared wall. Cutting away a breast may fall under Section 2 and can affect support for the neighbouring owner's chimney or the remaining wall structure.
Practical tip: Include the structural engineer's proposals for supporting the remaining masonry and any associated steelwork.
Party Wall Boundary Wall
A party wall boundary wall project needs to be assessed according to where the proposed wall will stand.
Building a new wall astride the boundary can fall under Section 1. A wall built wholly on your land may also require consideration under Section 1, while its foundations could raise separate Section 6 questions if excavation meets the statutory tests.
Practical tip: Provide a clear boundary plan and foundation details so the proposed wall's position can be assessed.
A party wall boundary wall project needs to be assessed according to where the proposed wall will stand.
Building a new wall astride the boundary can fall under Section 1. A wall built wholly on your land may also require consideration under Section 1, while its foundations could raise separate Section 6 questions if excavation meets the statutory tests.
Practical tip: Provide a clear boundary plan and foundation details so the proposed wall's position can be assessed.
Why Early Party Wall Advice Matters
Understand Legal Responsibilities
Ensure full compliance with the 1996 Act from day one.
Budget Accurately
Account for all party wall costs early in your project planning.
Prevent Project Delays
Avoid work stoppages due to missing or invalid legal notices.
Protect Neighbour Relationships
Maintain goodwill through clear communication and professional handling.
Avoid Invalid Notices
Professionally drafted notices that stand up to legal scrutiny.
Reduce Risk of Injunctions
Stop legal challenges before they halt your construction progress.
The earlier the process is handled correctly, the easier your build becomes.
Our Party Wall Services
Professional Support for Every Stage of Your Project
One of the biggest benefits of professional party wall advice in London is preventing disputes before they happen.
Our surveyors regularly anticipate the concerns adjoining owners may raise and that may include:
Our surveyors regularly anticipate the concerns adjoining owners may raise and that may include:
Our Services Include:
Party Wall Proposal Assessments
Party Wall Notices
Party Wall Awards
Schedule of Condition Reports
Agreed Surveyor Services
Section 1, 2 & 6 Notices
Loft Conversion Party Wall Advice
Basement Excavation Assessments
Neighbour Dispute Resolution
Access Licences
Boundary & Structural Advice
Whether you are at the planning stage or already facing a dispute, our surveyors are here to help.
Speak to a Party Wall Surveyor TodayWhy Choose Party Walls Limited?
Trusted Expertise Across London
Choosing the right surveyor can make the difference between a smooth project and a stressful legal dispute.
Here’s Why Clients Choose Us:
Experienced London Specialists
We understand the unique structural and legal challenges associated with London properties, including Victorian terraces, basements, and high-density developments.
Fast Response Times
We can quickly assess drawings, prepare notices, and arrange Schedules of Condition to keep your project moving.
Clear Fixed-Fee Pricing
Transparent costs with no hidden surprises.
Impartial & Professional Advice
We focus on practical, legally compliant solutions that protect both owners.
Regulated Standards
We work alongside qualified professionals and follow recognised industry standards.
Excellent Client Satisfaction
Our reputation is built on professionalism, responsiveness, and clear communication.
Trusted by London Homeowners & Developers
Adding independent reviews helps homeowners feel confident before choosing a surveyor.
Always a pleasure working with you and Steve.
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Mark
Head of Design, Layers
I would like to speak for both of us to say thank you and thanks to Stephen for all of his hard work. He has been incredibly helpful with the situation we were faced with and we are extremely appreciative.
Jack and Madeleine
Head of Design, Layers
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Speak With a Surveyor Near You
We proudly support homeowners and developers across:
- Putney
- Wimbledon
- Lambeth
- West London
- Wandsworth
- Kensington & Chelsea
- Twickenham
- South West London
Get Professional Party Wall Advice Before You Build
Our team provides practical, straightforward Party Wall Surveyor Free Advice customised as per your project requirements.
We help:
Building Owners
Adjoining Owners
Architects
Developers
Contractors
What You Can Expect:
- Professional review of your drawings
- Guidance on notices and timelines
- Transparent cost expectations
- Clear explanation of legal requirements
- Advice on likely neighbour responses
- Recommendations for the most efficient route forward
Book Your Free Consultation Today
Call Us: 020 8877 0365
Or submit your project details using our online enquiry form to receive expert guidance from an experienced London surveyor.
Request a Call BackFrequently Asked Questions
1. What is a Party Wall proposal assessment?
A Party Wall proposal assessment is a professional review of your architectural or engineering drawings to determine whether your planned works fall under the Party Wall etc. Act 1996. The assessment identifies what notices, protections, and legal procedures may be required before construction begins.
2. Do I need a Party Wall surveyor for my project?
If your project affects a shared wall, boundary structure, or involves excavation near neighbouring foundations, you will likely need professional party wall advice. Common projects include loft conversions, extensions, basement works, and chimney breast removals.
3. What types of work require assessment under the Party Wall Act?
Projects commonly requiring assessment include:
i. Loft conversions
ii. Rear and side extensions
iii. Basement excavations
iv. Structural wall removals
v. Chimney breast removals
vi. Boundary wall construction
vii. Excavation near neighbouring properties
i. Loft conversions
ii. Rear and side extensions
iii. Basement excavations
iv. Structural wall removals
v. Chimney breast removals
vi. Boundary wall construction
vii. Excavation near neighbouring properties
4. What happens if my project falls under the Party Wall Act?
If the Act applies, formal Party Wall Notices must usually be served on adjoining owners. If neighbours consent, work may proceed. If they dissent or fail to respond within 14 days, surveyors are appointed to prepare a legally binding Party Wall Award.
5. Can you advise before I start my project?
Yes. In fact, we strongly recommend seeking professional party wall advice, London homeowners can rely on before finalising construction timelines. Early advice helps prevent delays, invalid notices, and neighbour disputes.
6. How long does a proposal assessment take?
Most proposal assessments can be completed quickly once drawings and project details are received. Timeframes vary depending on the complexity of the works, but early engagement allows for smoother project planning.
7. What information do you need to assess my proposal?
We typically require:
i. Architectural drawings
ii. Structural engineer details (if available)
iii. Property address
iv. Description of proposed works
v. Estimated construction timeline
vi. The more detail provided, the more accurate and useful our assessment will be.