Planning a Home Extension?
What Surrey Homeowners Need to Know About Party Walls and Neighbours

Planning an extension or renovation is exciting. You're imagining the extra space, a better layout and all the ways your home could work better for you and your family.
But homeowners sometimes overlook one important consideration when planning building work.
Your neighbours.
Whether you're extending a semi-detached property, renovating a terraced house or carrying out groundworks close to a neighbouring building, your project may affect more than just your own home.
And depending on the work involved, there may be legal requirements to follow before construction can begin.
Understanding party walls, communicating with neighbours and planning carefully can help avoid unnecessary disagreements, delays and unexpected costs.
Here's what Surrey homeowners should know before starting a building project.
1. What Is a Party Wall?
A party wall is generally a wall shared by two properties or owners.
For example, if you live in a terraced or semi-detached house, the wall separating your home from your neighbour's property may be a party wall.
Party walls can also include certain boundary walls and structures separating different properties.
In England and Wales, some building work affecting these structures is covered by the Party Wall etc. Act 1996.
The legislation provides a process for notifying neighbouring property owners and resolving disputes about particular types of construction work.
Importantly, the rules don't apply only to work directly involving a shared wall.
Certain excavations near neighbouring buildings and construction at property boundaries can also fall under the Act.
This is why understanding the requirements early is so important.
2. What Types of Building Work Might Require a Party Wall Notice?
Not every home improvement project requires a party wall notice.
Painting, decorating, fitting shelves or carrying out minor internal improvements will not usually trigger the requirements.
However, more substantial construction work may.
Examples include:
- Cutting into a shared wall to install structural beams
- Removing a chimney breast from a party wall
- Raising or altering a party wall
- Building a new wall at or along a property boundary
- Excavating foundations close to neighbouring buildings, where the Act's distance and depth conditions apply
- Carrying out certain structural alterations affecting shared walls
For example, a homeowner planning a rear extension might assume that because the extension is entirely within their own garden, their neighbours don't need to be involved.
But if the foundations require excavation close to a neighbouring building, the Party Wall Act may still apply.
The important point is that the type and location of the work determine whether formal notification is required.
A qualified party wall surveyor can advise on the specific circumstances of your project.
3. Is a Party Wall Agreement the Same as Planning Permission?
No. They are separate matters.
Planning permission deals with whether a proposed development is acceptable under planning rules.
Building Regulations establish standards for matters such as structural safety, fire safety, ventilation and energy efficiency.
The Party Wall Act deals with certain building works affecting shared structures, boundaries and neighbouring buildings.
You could have planning permission for your extension and still need to follow the Party Wall Act.
Equally, a project that falls within permitted development rights may still require party wall notices.
Having permission to build does not automatically mean you can begin every aspect of the work immediately.
All relevant requirements should be checked before construction starts.
4. When Should You Tell Your Neighbours?
As early as reasonably possible.
If your project involves work covered by the Party Wall Act, formal notice periods apply.
Generally:
- Work affecting an existing party wall or party structure requires at least two months' notice.
- Certain boundary wall construction and qualifying excavation work require at least one month's notice.
Notices normally remain valid for 12 months, and earlier commencement may be possible where the relevant adjoining owners agree in writing.
However, it's worth having an informal conversation before issuing formal notices.
Explaining what you're planning, how long the work might take and what disruption may be involved can help reassure neighbours.
A friendly conversation doesn't replace a legally required notice, but it can make the process considerably more straightforward.
5. What Happens If Your Neighbour Doesn't Agree?
One common concern is that a neighbour can simply refuse permission and prevent a lawful building project from going ahead.
The reality is more nuanced.
For work covered by the Party Wall Act, a neighbour may consent to the proposed work or dissent.
Where a dispute arises, the Act provides a process involving appointed surveyors.
The surveyor or surveyors can prepare a formal document known as a Party Wall Award, setting out how the relevant work may proceed and measures needed to protect the adjoining property.
This process is intended to help protect the interests of both parties.
It does not mean that every disagreement will stop a project indefinitely.
However, the procedure can introduce additional time and expense, so it's important to account for it when planning your construction schedule.
There are also particular rules for building a new wall astride a boundary, which requires the adjoining owner's written consent.
6. Why Good Communication Matters During Construction
Legal requirements are only part of the picture.
Even when all the necessary permissions and notices are in place, building work can affect the people living nearby.
Construction may involve deliveries, noise, dust, temporary access restrictions and additional vehicles.
While some disruption is unavoidable, thoughtful planning can help minimise inconvenience.
Good practice includes:
- Letting neighbours know when work is expected to begin
- Explaining the likely duration of the project
- Keeping access routes and shared areas clear where possible
- Managing deliveries and construction traffic responsibly
- Taking reasonable steps to control dust and noise
- Communicating promptly if plans or timings change
A well-managed construction site isn't just about the work happening inside the property boundary.
It's also about respecting the surrounding environment and the people who live there.
7. What About Building Close to a Boundary?
Property boundaries can create practical challenges during home extensions and renovations.
Before work begins, it's important to establish exactly where the boundary lies and whether the proposed construction could affect neighbouring land or structures.
This may influence:
- Foundation design
- Access for construction
- Scaffolding arrangements
- Drainage
- Wall positioning
- Excavation methods
- Maintenance access once the work is complete
Boundary positions should never simply be assumed.
Where there is uncertainty, professional advice may be needed to establish the relevant legal and physical boundaries.
Careful preparation can help prevent disagreements that might otherwise arise once work is underway.
8. Why November Is a Good Time to Start These Conversations
If you're hoping to begin a home extension or significant renovation in spring 2027, November is a sensible time to start exploring the practical requirements.
Larger projects can involve drawings, structural calculations, planning considerations, Building Regulations and potentially party wall procedures.
Leaving these discussions until the last minute can create unnecessary pressure.
By starting earlier, you have more time to understand the property, establish whether adjoining owners need to be notified and factor any surveyor involvement into your schedule.
You can also begin discussing your plans with neighbours before construction activity is imminent.
Good planning isn't only about getting your own home ready for building work. It's about making sure the wider project is ready too.
9. Choosing a Construction Team That Understands the Bigger Picture
A successful building project involves much more than the physical construction.
It requires coordination, communication, attention to detail and an understanding of how different stages of the project fit together.
When choosing a construction team, it's worth asking how they approach projects involving neighbouring properties, restricted access or structural alterations.
An experienced builder should recognise when specialist advice may be required and work with the appropriate professionals.
For example, a structural engineer may be needed to assess load-bearing alterations, while a party wall surveyor can advise on statutory notices and awards.
Having the right people involved at the right stage can help prevent avoidable complications later.
10. Start Your Home Improvement Project with Confidence
Whether you're planning a kitchen extension, loft conversion, structural renovation or larger home transformation, preparation makes a difference.
Understanding your responsibilities towards neighbouring properties is an important part of that preparation.
By checking the requirements early, communicating openly and working with experienced professionals, you can give your project a stronger foundation before construction begins.
After all, a successful renovation should improve your home without creating unnecessary difficulties along the way.
Planning a Home Extension or Renovation in Surrey?
At Jigsaw Construction Surrey Ltd, we understand that every property and construction project comes with its own considerations.
From extensions and conversions to structural alterations and wider renovations, our focus is on quality workmanship, practical planning and clear communication throughout the construction process.
We believe homeowners should feel confident about the work being undertaken, understand the key stages of their project and know what to expect along the way.
If you're considering extending or renovating your property in Surrey, Hampshire or West Sussex, we'd be delighted to discuss your plans and help you explore the next steps.
Get in touch with Jigsaw Construction Surrey Ltd to start the conversation.
Plan carefully. Communicate clearly. Build with confidence.
Please note: This article provides general information for homeowners in England and Wales. Party wall requirements depend on the proposed work and the individual property. Seek advice from a suitably qualified party wall surveyor or legal professional where necessary.




