A crack that was not there last week is hard to ignore when builders next door have just started digging foundations for an extension. The same goes for a door that suddenly sticks, plaster pulling away from a wall or water appearing where it never did before. It is hard not to join the dots.
And sometimes that is exactly what has happened. But proving the connection can be more difficult than it first appears, particularly if your neighbour says the crack was already there or the builder insists the work could not have caused it.
If your neighbour’s building work has damaged your property, there are really three things to establish: Whether anything needs to be made safe immediately, what caused the damage and who is legally responsible for putting it right.
This guide explains how to approach those questions, what evidence is worth preserving, when the Party Wall etc. Act 1996 matters and what you can do if your neighbour or their builder refuses responsibility.
This article deals specifically with physical damage that has already occurred. If the problem is that notifiable work has started without a party wall notice, see what to do if your neighbour has ignored the Party Wall Act. If a wall, foundation or other part of the development has actually crossed the boundary, see my neighbour has built on my land.
Contents
- My neighbour’s building work has damaged my property: What should I do first?
- First make sure the property is safe
- Record the damage before it is repaired
- Who is responsible for damage caused by a neighbour’s building work?
- How do you prove the building work caused the damage?
- Should you contact your home insurer?
- Should you let the neighbour’s builder repair the damage?
- What can you claim for?
- What if the building work is still continuing?
- What if your neighbour refuses responsibility?
- How long do you have to bring a claim?
- Frequently asked questions
My neighbour’s building work has damaged my property: What should I do first?
Start with safety. If there is significant movement, falling masonry, a bulging wall, exposed foundations or another possible structural danger, keep people away from the affected area and obtain urgent professional advice.
Otherwise, resist the temptation to repair everything immediately. Photograph the damage, tell your neighbour in writing and notify your home insurer. If the damage may be structural, an independent building surveyor or structural engineer may need to investigate what caused it.
If the work is being carried out under the Party Wall etc. Act 1996 and a surveyor or surveyors have been appointed, contact them as well. Where damage results from work carried out in pursuance of the Act, the building owner is responsible for compensating the adjoining owner or occupier, even where the damage was actually caused by their contractor.
Outside the Act, responsibility is more fact-sensitive. Depending on what happened, liability may rest with the neighbour, the builder or another person involved in the work.
First make sure the property is safe
Most cracks are not evidence that a house is about to become structurally unsafe. Buildings move for all sorts of reasons, and minor cracking can have an innocent explanation.
Some changes deserve prompt attention, however, particularly if they appear suddenly during excavation, underpinning, demolition or substantial structural work next door. Warning signs can include rapidly widening cracks, walls moving out of line, floors dropping, doors or windows suddenly jamming, roof movement or masonry becoming loose.
If you suspect an immediate structural danger, contact an appropriately qualified structural engineer. Your local authority’s building control or dangerous structures team may also need to become involved. Local authorities have powers to deal with dangerous buildings and structures under section 78 of the Building Act 1984.
If there is an immediate risk to life, contact the emergency services. Do not go onto the neighbouring building site yourself or interfere with excavations, scaffolding, props or temporary supports.
In practice, it is easy for an argument about who is to blame to take over. That question matters, but if there is a genuine structural concern, establishing that the property is safe comes first.
Record the damage before it is repaired
Good evidence can make an enormous difference if responsibility is later disputed.
Take dated photographs and video. Include close-ups, but also wider photographs showing where the damage sits within the room, wall or exterior of the property. Photograph it again if it changes.
Look for older photographs too. Estate-agent particulars, family photographs, pictures taken before decorating and even images sitting unnoticed on your phone may show what the same wall looked like before the work began.
Keep relevant emails and messages, plans you have received, details of the contractor and a simple note of when the neighbouring work started and when you first noticed the problem.
If the work was subject to the Party Wall Act, there may already be a schedule of condition recording the state of your property before work began. The Government’s Party Wall Act explanatory booklet describes a schedule of condition as a written record, usually supported by photographs, of the neighbouring property before work starts.
I found in practice that some of the most useful evidence in property disputes was often surprisingly ordinary. A photograph taken months earlier for an entirely different reason can sometimes answer the apparently simple but crucial question: Was that crack there before?
Unless urgent work is necessary, avoid having significant damage filled, plastered or redecorated until it has been properly recorded and, where appropriate, inspected.
Who is responsible for damage caused by a neighbour’s building work?
There is no rule that makes a homeowner automatically liable whenever their builder damages the property next door. Equally, a neighbour cannot necessarily avoid responsibility simply by saying, “It was the builder, not me.”
The legal position depends partly on whether the work falls within the Party Wall etc. Act 1996.
If the Party Wall Act applies
The Act covers particular types of work, including specified work to party walls and structures, building at the line of junction and some excavation close to neighbouring buildings. My separate guide explains when the Party Wall Act applies.
Where work is carried out in pursuance of the Act, section 7(2) of the Party Wall etc. Act 1996 requires the building owner to compensate an adjoining owner or occupier for loss or damage resulting from the work. Government guidance puts the practical position particularly clearly: The building owner is legally responsible for putting right damage caused by the works, even where the damage was actually caused by their contractor.
If a party wall award is already in place, contact the appointed surveyor or surveyors promptly. The damage may be capable of being dealt with through the statutory procedure.
What if no party wall notice was ever served?
The position is different where the work should have been notified but the building owner never served the required notice.
In Power v Shah [2023] EWCA Civ 239, the Court of Appeal confirmed that an adjoining owner cannot unilaterally invoke the Act’s section 10 surveyor procedure where the building owner has not served the statutory notice and has not invoked the Act.
That does not mean the neighbour whose property has been damaged is left without a remedy. Claims may still arise under the ordinary law, depending on what happened. My separate guide considers the wider position where a neighbour has failed to comply with the Party Wall Act.
What if the work is outside the Party Wall Act?
The Party Wall Act is not the only protection against damage caused by neighbouring building work.
Depending on the facts, ordinary legal principles involving negligence, private nuisance, trespass or rights of support may apply. A contractor who carries out excavation, demolition or structural work carelessly may itself be liable for the resulting damage.
Whether the neighbour who employed the contractor is also liable depends on the circumstances. A homeowner is not automatically responsible for every negligent act of an independent contractor, although there are situations in which responsibility can extend beyond the person who physically carried out the work.
Planning permission and building regulations approval do not provide a defence to a private claim for damage. They deal with different questions. Permission to build an extension does not amount to permission to damage the house next door.
How do you prove the building work caused the damage?
This is often the heart of the dispute.
If excavation starts on Monday and a substantial new crack appears on Wednesday, the timing is obviously relevant. But it does not necessarily prove what caused the crack. Your neighbour may say it reflects historic settlement, seasonal movement or a defect that existed before the work began.
For significant damage, an independent building surveyor or structural engineer may need to identify the likely mechanism. Depending on the project, that might be loss of ground support during excavation, inadequate temporary works, movement of a party wall, vibration, water getting into a newly exposed structure or direct physical damage from the building operation.
The Court of Appeal considered this issue in Taylor v Jones [2024] EWCA Civ 170. The case concerned damage arising from work under the Party Wall Act. An important part of the exercise was distinguishing damage actually caused by the works from defects that had already existed.
That distinction matters. Your neighbour should not generally have to pay to cure an unrelated historic defect simply because it is discovered while repairing new damage. On the other hand, the fact that a property already had some deterioration does not mean new damage caused by building work can simply be dismissed as “pre-existing”.
This is where old photographs, a schedule of condition and a good expert inspection can become particularly valuable.
There is also a practical point about experts. More reports do not necessarily mean better evidence. For an ordinary domestic dispute, one appropriately qualified expert answering the right question is often more useful than several professionals producing overlapping reports at considerable cost.
Should you contact your home insurer?
Usually, yes.
Tell your insurer promptly, even if you believe your neighbour or their contractor should ultimately pay for the damage. Your policy may cover some or all of the loss, and the insurer may want to inspect before permanent repairs are carried out.
Some home insurance policies also include legal expenses cover, which may help if liability becomes disputed. Check the terms rather than assuming cover exists, and notify the insurer before incurring legal costs if the policy requires you to do so.
If your insurer pays the claim, it may then seek recovery from whoever was legally responsible. Making an insurance claim does not necessarily mean the neighbour or contractor escapes liability.
Emergency work is different. If something needs to be done immediately to protect the property, take reasonable steps to prevent further damage. Photograph the position first if you safely can and keep receipts and records of what was done.
Should you let the neighbour’s builder repair the damage?
Sometimes that is the simplest solution. If a builder has knocked off a small section of render, accepts responsibility and offers a straightforward repair, there may be little benefit in turning the incident into a major dispute.
Structural movement is another matter.
If there is disagreement about the cause or extent of the damage, or if cracks need monitoring, obtain an independent assessment before allowing the builder to fill and redecorate them. A cosmetic repair can make the evidence much harder to assess without addressing the underlying problem.
Nor do you necessarily have to accept the neighbour’s preferred contractor simply because they offer to put things right. The proposed repair must be reasonable and appropriate.
That does not mean refusing a sensible repair proposal is consequence-free. If the proposed work would properly restore the property and you reject it without good reason, that may later be relevant to whether you acted reasonably to limit your loss.
If a party wall award applies, involve the surveyor or surveyors before agreeing how the damage will be made good or compensated. If the eventual repair requires access over neighbouring land, my separate guide explains whether a neighbour can refuse access for repairs.
What can you claim for?
The starting point is compensation for the loss actually caused, rather than an opportunity to improve the property at somebody else’s expense.
Depending on the legal basis of the claim and the evidence, that may include the reasonable cost of investigating and repairing the damage, associated redecoration and other directly resulting financial loss. In a more serious case, reasonable alternative accommodation or loss of rent may also arise if the property cannot properly be occupied or let.
Reasonable professional fees may also form part of a claim in appropriate circumstances, but this does not mean every surveyor, engineer or legal bill will automatically be recoverable.
You are also expected to act reasonably. If temporary work costing a modest amount would prevent water entering the house for another month, it would generally be unwise simply to allow the damage to worsen while responsibility is argued about.
What if the building work is still continuing?
If you believe ongoing work is causing further damage, raise the problem with your neighbour immediately and put it in writing. Identify what you have seen and ask for the potentially damaging part of the work to be stopped while the position is investigated.
If there is a party wall award, contact the surveyor or surveyors straight away.
If work that should have been notified is continuing without a party wall notice, the Act’s surveyor procedure cannot simply be activated unilaterally by the adjoining owner. If the continuing work also threatens trespass, nuisance or physical damage to your property, urgent legal advice may be needed about the ordinary legal remedies available. Those remedies can include an injunction in an appropriate case, but injunctions are discretionary and the costs consequences can be significant.
If the real concern is not damage but where the extension is being built, see my guide to how close a neighbour can build to the boundary. If the structure has actually crossed onto your land, that raises the separate issue of building over the legal boundary.
What if your neighbour refuses responsibility?
Once any immediate safety issue has been dealt with, try to establish the facts before the dispute becomes entrenched.
Set out the damage in writing, when you first noticed it and why you believe the building work caused it. Send relevant photographs or expert findings and explain what you want to happen next.
If proceedings are being considered, the parties will normally be expected to exchange sufficient information to understand each other’s position and consider whether the dispute can be resolved without going to court. Depending on the nature of the claim, a particular pre-action protocol may apply. The civil procedure rules also emphasise proportionality and the use of alternative dispute resolution.
The official Practice Direction on pre-action conduct and protocols is useful background, although the procedure that applies to a particular dispute will depend on the claim.
A joint inspection or an agreed independent expert can sometimes resolve the central issue surprisingly quickly. Mediation may also be worthwhile where the technical evidence is reasonably clear but the parties cannot agree responsibility or the cost of repairs.
For a broader look at dealing with a deteriorating neighbour relationship, see how to resolve a neighbour dispute.
If litigation is becoming a realistic possibility, cost needs to be considered alongside the amount at stake. My separate guide explains the costs and financial risks of property litigation.
How long do you have to bring a claim?
Do not assume that you necessarily have six years from the day you first notice the problem.
Under the Limitation Act 1980, many claims in tort are subject to a six-year limitation period running from when the cause of action accrued. There are separate provisions that can affect some negligence claims involving latent damage, including rules based on later knowledge and a longstop period.
Neighbouring building disputes can involve different causes of action, and identifying when time began to run is not always straightforward. If substantial damage has occurred, or several years have already passed, the safest course is to establish the applicable limitation period rather than relying on a general six-year rule.
Frequently asked questions
Are new cracks proof that my neighbour’s building work caused them?
No. The timing may be important evidence, but the cause can still be disputed. For significant damage, a surveyor or structural engineer may need to determine whether the pattern and timing are consistent with the neighbouring work.
Can my neighbour just tell me to claim against the builder?
Not necessarily. Where damage results from work carried out under the Party Wall Act, the building owner can have statutory responsibility for the damage even if their contractor caused it. Outside the Act, liability depends on the facts and may rest with the contractor, the neighbour or potentially more than one party.
Can I claim the cost of a structural engineer?
Potentially, if obtaining the report was a reasonable and proportionate response to the damage. Professional fees are not automatically recoverable in every case.
Do I have to let my neighbour’s builder repair the damage?
Not simply because that is your neighbour’s preferred solution. With significant or disputed damage, it is sensible to establish the cause and proper repair method before work begins. But refusing a reasonable proposal without good reason may become relevant if it causes the loss to increase.
What if my neighbour says the crack was already there?
Look for evidence showing the earlier condition of the property. A party wall schedule of condition can be particularly helpful, but older photographs, survey reports and photographs taken for unrelated reasons may also assist. An expert may be able to distinguish recent movement from older cracking.
What if the new building has actually crossed onto my land?
That raises a different issue. A wall, foundation or other structure built across the legal boundary may amount to trespass. See what to do if your neighbour has built on your land.
The practical point: Establish what happened before deciding who pays
Damage caused during building work next door can become personal very quickly. A crack appears. The neighbour says it was already there. The builder says the work could not possibly have caused it. Before long, everybody is arguing about responsibility without anybody having established why the damage occurred.
A more useful approach is usually much simpler. Make sure the property is safe. Photograph what has happened. Preserve whatever evidence exists of its previous condition. Then, if necessary, get the right person to identify the likely cause.
Once that has been established, the dispute often becomes much narrower: This work caused this damage, this is what reasonably needs to be done to repair it, and this is what it will cost.
That is a much better starting point for reaching an agreement, dealing with the matter under an existing party wall award, pursuing an insurance claim or, if it cannot be resolved, considering legal action.
Last legally reviewed: 31 August 2026
This article is based on general principles of English and Welsh law, is intended for informational purposes only, and does not constitute legal advice or establish a professional relationship.
