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Introduction to The Party Wall Act
The Party Wall Act 1996 is an essential piece of legislation in England and Wales that provides a framework for preventing and resolving disputes between neighbouring property owners. If you’re planning on undertaking works that affect a shared property boundary or involve certain types of groundwork, especially within 6 metres of a neighbour’s structure, then this law directly applies to you. Understanding the implications of the Party Wall Act, and specifically how it relates to foundations within 6 metres, is vital for property owners, builders, and developers to ensure projects run smoothly and legally.
Understanding the Party Wall Act
The Party Wall Act ensures that excavation and building works close to adjoining properties are carried out in a manner that protects the interests of all those affected. The Act covers three main types of work:
- Works to an existing party wall or structure
- Construction of new walls at or astride the boundary line
- Excavations near neighbouring buildings or structures
This article focuses on the third aspect—excavation works for foundations within a distance of 6 metres from a neighbouring building, which triggers specific duties under the Party Wall Act.
What Triggers the Party Wall Act?
Many homeowners are unaware that simple groundwork, such as digging for an extension or new foundations, can trigger legal requirements under the Party Wall Act. The most common triggers include:
- Excavating within 3 metres of an adjoining structure if the proposed works go deeper than the neighbour’s foundations.
- Excavating within 6 metres of a neighbouring building when certain angular planes are intersected by the proposed excavation.
It’s not just work directly at a boundary that matters; depth and proximity play a critical role.
Excavation and Foundation Works Within 6 Metres
When planning to excavate for new foundations, the Party Wall Act applies if your excavation:
- Is within 6 metres of an adjoining owner’s building or structure, and
- Will go deeper than the existing foundations of that building or structure.
This rule is intended to protect neighbouring properties from destabilisation or damage resulting from excavation. Builders and property owners must provide notice and follow specific procedures laid down by the Act.
Why Are Foundations Within 6 Metres Significant?
Deep excavations can potentially undermine the support of adjacent buildings. This risk increases when works are undertaken close to existing properties, especially those with shallow or older foundations. The 6-metre rule provided by the Party Wall Act is designed to preemptively address these risks. If your works fall within this category, you must serve notice to the adjoining owner and, where necessary, commission detailed structural assessments.
Serving Notice Under the Party Wall Act
For excavation and foundation works within 6 metres, the person undertaking the works (the “building owner”) has a legal duty to serve a “Section 6 Notice” at least one month before starting. This notice must provide:
- Full details of the intended excavation
- Plans, sections, and depths of the new foundations
- Details about how the works will impact adjoining properties
The adjoining owner then has 14 days to respond. If they consent, the works can proceed. If not, or if there is no response, a ‘dispute’ is deemed to have arisen, and the Act’s dispute resolution process must be followed.
The Dispute Resolution Process
If a dispute arises (i.e., the neighbouring owner does not agree to the works or simply does not respond), both parties must appoint a surveyor. This could be:
- A single ‘Agreed Surveyor’ acting for both sides, or
- Each owner appoints their own surveyor. If the two cannot agree, a third surveyor may be called in.
These surveyors form an impartial team to assess the works, consider the risks and appropriate safeguards, and ultimately create a ‘Party Wall Award’ (a legally binding document that sets out what work can be done, how, and under what conditions).
What is a Party Wall Award?
A Party Wall Award is the central legal document that controls how works proceed under the Party Wall Act. For foundation works within 6 metres, this Award will usually:
- Specify the exact nature and timing of the works
- Prescribe necessary protections for the neighbour’s property
- Set out who is responsible for costs and any necessary remedial work
- Include a schedule of condition (a formal record of the neighbour’s property condition before works start)
Both parties are legally bound by the Award. Disputes or concerns about compliance can be taken to the county court.
Technical Considerations for Excavations Within 6 Metres
Carrying out excavation and foundation works within 6 metres of an adjoining property isn’t just a legal question; it also demands technical care. Key factors to consider include:
- Type and depth of existing neighbouring foundations (e.g., strip, raft, piled)
- Soil type and ground conditions
- The structural condition of both properties
- Vibration, settlement, and groundwater changes
- The need for temporary supports or underpinning
Surveyors may require the input of structural engineers and detailed site investigations to safeguard both properties.
Common Types of Works Affected
The following are typical residential works affected by the Party Wall Act’s 6-metre rule:
- Single or double-storey extensions
- New build homes on infill plots
- Basement excavations
- Garden rooms or detached garages with deep foundations
- Retaining walls and underpinning existing structures
Each project will require careful planning to ensure statutory requirements are met.
Role of Party Wall Surveyors
Qualified party wall surveyors are specialists in navigating the requirements of the Party Wall Act. Their role includes:
- Advising on whether the Act applies to your project
- Serving notices and managing responses
- Preparing schedules of condition and overseeing photographic surveys
- Drafting and agreeing the Party Wall Award
- Overseeing the progress of the works and ensuring compliance with the Award
Engaging a party wall surveyor early is highly recommended, especially for complex or contentious projects.
Frequently Asked Questions About Foundations and the Party Wall Act
Q1: Do I need to serve notice for shallow foundations?
Yes, if your excavation is within 6 metres of an adjoining structure and goes deeper than their foundations, you must serve notice, even for small works.
Q2: What happens if I ignore the Party Wall Act?
Failing to serve proper notice or comply with the Award can lead to injunctions (court orders halting works), compensation claims for damages, or additional legal costs. Non-compliance is risky and can delay your project.
Q3: What if my neighbour refuses consent unreasonably?
The Act has clear processes for resolving disputes. Unreasonable refusal to consent doesn’t block your works, but you must follow the dispute resolution mechanism with surveyors.
Q4: Who pays for the Party Wall surveyor and associated costs?
Usually, the building owner proposing the works pays for surveyor fees and reasonable adjoining owner costs, since the works are for their benefit. This includes professional fees, any extra investigations, and remedial works if required.
Practical Steps for Compliance