Boundary Disputes with Neighbours: Fences, Hedges and the Law

A large share of the boundary disputes with neighbours that reach a surveyor or a solicitor have nothing to do with the Party Wall Act. They are the ordinary, common-law disputes of living next to someone: a fence that has moved a few inches over the years, a tree whose branches shade your patio or whose roots are lifting your path, a hedge that has grown into a wall and now blocks your light, or a garden that one side says has "always been" theirs. These are governed not by a special party wall statute but by the common law and by a handful of general statutes, and the rules are often more generous to a neighbour than most people assume — and more complicated than the "it's my side, you move it" that a kitchen-table argument produces. This guide is a plain-English map of that terrain. It is deliberately a common-law guide, not a party wall one, and that is exactly why it is useful: it covers the disputes the Act simply does not touch, and it points you to the party wall pages when the two worlds meet.

The important thing to understand is that most of these disputes turn on a question of fact — where the boundary actually is, what has been done, for how long — rather than on a neat legal formula. That is why the first piece of advice is the same every time: establish the facts before you take a position. Get the documents (your title, or your deeds), get a measured picture of the ground, and only then decide what you are entitled to do. This is guidance, not legal advice, and where a right is genuinely in dispute a solicitor should have the final word — but you should be able to follow the argument, and to know which of the options below are realistic before you spend money or goodwill on the wrong one.

Where the Boundary Actually Is: The Document Versus the Ground

Almost every common-law boundary dispute starts with the same question, and it is a question of fact, not of opinion: where does your land end? The answer comes from your title (for registered property) or your deeds (for unregistered property). A fence next to that line can sit wholly on your side, astride the boundary, or wholly on your neighbour's side — and which of those it is must be worked out from the documents and from the ground, not assumed. Check your title or deeds first, because a boundary dispute is, first and foremost, a document problem dressed up as a fence problem.

The difficulty is that the legal boundary and the physical reality can drift apart. A fence can be rebuilt a few inches either side of the line, a wall can sag, a garden can be informally divided by an old gate that has become the de facto line, and the physical position can settle into place over decades. When that happens, the dispute is really about which version of the boundary counts. And here is the trap that catches a lot of people: a fence that has "always been there" is not, by itself, proof of where the boundary is. If the fence is on the wrong side of the legal line, and one party has, in effect, taken possession of the strip between the legal line and the fence, that can, in the right circumstances, raise an adverse possession question — the possibility that the party who has occupied the land for long enough has acquired title to it. That is the single most important reason to get a surveyor involved in a boundary dispute, because a surveyor can establish exactly where the fence is, relative to the documents, and whether that gap is wide and old enough to matter. Our boundary calculator is a quick way to start that picture.

Adverse Possession: When "It's Been There Forever" Actually Means Something

Adverse possession — the old "squatter's rights" idea — is the legal mechanism by which a person who occupies land that is not theirs can, after a long enough period, acquire title to it. It is a difficult claim and it is fact-specific, but it is the law that lurks behind a great many boundary disagreements, and it is the one you need to understand before you assume you are safe because you have always used a bit of garden.

The timing is set by statute, and it depends on whether the land is registered. Broadly, a person who has been in adverse possession of land for long enough, without the true owner having brought a claim, may be able to acquire title to it — but the period that applies, and how it is measured, are questions of law a solicitor should confirm for your particular land, and no rule of thumb is safe. For registered land there is a separate application process to the Land Registry: the occupier applies to be registered as proprietor, but the true owner (and any other person with an interest, such as a mortgagee) has the right to object, and if they do, the application fails unless the occupier can show one of the statutory conditions is met (for example, that the boundary is not clearly shown on the register, or that there has been a mistake in the register, or that the occupier has relied on a mistaken assumption about the boundary). That objection process is exactly why adverse possession claims are harder than the old "it's been there forever" idea suggests, and why a solicitor is essential if you are either making or defending one.

Two practical points. First, adverse possession is about possession that is exclusive, open, and to the exclusion of the true owner — it is not about merely using a bit of a neighbour's land, or about a fence being on the wrong line. It requires a genuine assumption of ownership, and that is a question of fact a court will weigh up. Second, it is a double-edged sword: it is the same doctrine that means if you have, over the years, been in effective possession of a strip of a neighbour's land (for example because a fence was wrongly built on their side), you may have a claim — but it is also the doctrine your neighbour may use against you if you have been encroaching on theirs. Which side of the line you sit on is exactly the kind of thing a surveyor establishes with a measured plan, and it is why a boundary dispute that has been "the same for twenty years" is precisely the one that most needs a proper factual record rather than a recollection.

Boundary Fences and Walls: Who Owns It, and Who Has to Fix It?

One of the most common — and most misapprehended — questions is: whose fence is it, and who has to repair it? On the first part, a fence can have one of three relationships to the boundary: it can sit wholly on one side, it can sit astride the line, or it can sit wholly on the other side. Which of those applies is a question of fact and of the documents, not of who happened to paint it or who put it up at the last repair. Typical ways to work it out are the deed plans (and any T-marks or fencing covenants on the title) and, where a party wall forms part of the same boundary, the fence's relationship to the centre line of that party wall. Ownership follows from that relationship and from what the title or deeds say — so a fence that sits wholly on your neighbour's land is theirs, one that sits wholly on yours is yours, and one that sits astride may be shared, but none of those outcomes should be assumed before the documents and the measured position have been checked.

On maintenance, the law is less generous than people expect. There is no general statutory duty on a neighbour to repair or replace a boundary fence, even if it sits astride the line and even if it is rotting and falling down. Unless there is a covenant, a lease clause, or an agreement that says otherwise, a neighbour can lawfully decline to pay to replace a fence — including one that happens to sit on or across the boundary. What this means in practice is that if a boundary fence is failing and your neighbour will not touch it, you generally have a choice: pay to repair or replace the part you are entitled to deal with (and a safe, decent fence still protects your garden), or leave it. The law will not force your neighbour to act, and that is a genuine frustration but it is the position. It is also worth separating the fence from any wall that might be a party wall. If the structure in question is a shared party wall rather than a simple boundary fence, the Party Wall Act may apply to work on it, and that is a different, more structured regime with its own notice and award process. Our guide to what counts as a party wall sets out the tests for a party wall and a party fence wall.

Trees, Branches and Roots: What You Can and Cannot Cut

Trees are a classic source of boundary friction, and the common law gives you a clear, limited set of rights. The principle is straightforward: at common law a landowner may cut branches and roots that overhang or encroach onto their own land, back to their own boundary line, without their neighbour's permission. You do not have to ask. What you cannot do is go onto your neighbour's land to do the cutting, and what you cannot do is cut a healthy tree that stands wholly on your neighbour's side simply because you do not like the shade or the look of it — the right is to deal with what crosses the line, not with the whole tree.

There is a small but important etiquette point that people miss: the branches and roots you cut still belong to your neighbour, because they are part of a tree on their land. The courteous (and, on a strict reading, correct) thing is to offer to return them — though in practice most neighbours will be happy for you to bin them, and it is rarely worth the fuss. The bigger practical point is this: before you cut anything, check whether the tree is protected. A Tree Preservation Order (issued by the local authority) or a tree in a conservation area means the tree is protected, and cutting a protected tree without consent can have serious consequences, even where the tree stands on your own land. You may need the local planning authority's consent, and the rules on cutting back to the boundary can get more complicated. A two-minute call to the local planning authority before you cut anything can save you a very expensive mistake. Where the tree is on the boundary itself and is shared, the analysis gets more careful, and a solicitor will want to be involved before anything is cut.

Hedges and Walls: How the High Hedge Rules Work

A hedge that has grown into a wall, blocking your light and privacy, is a different beast from a tree, and it has its own statutory framework. Where a high hedge materially affects your reasonable enjoyment of your property (typically by blocking light or privacy), you can ask your local authority to investigate and, if it agrees, to require the hedge owner to reduce the hedge to a specified height or condition. Your local authority will confirm the process, the appeal route and the threshold that applies in your area. That is a formal process you can start yourself (the authority may charge a fee for a formal application, but it is modest compared with the cost of litigation), and it is the proper route for a genuinely problematic tall hedge.

Before that, though, the practical and usually successful route is the one the law itself points to: the Code of Practice for High Hedges, which sets out the sensible things to do — talk to your neighbour first, put your concern in writing, and only then approach the local authority. For more general hedge and boundary maintenance, the principle to hold on to is that a well-managed hedge is the cheapest way to keep a boundary dispute from becoming one: routine, regular trimming, and a clear shared understanding between neighbours of which stretch each of you looks after, cost far less in money and goodwill than an argument does, and they keep the hedge within the bounds that the framework above is designed to address. The through-point with trees is the same: before you do anything to a hedge or a tree, check the paperwork, because a protected tree, a boundary you do not actually own, or a neighbour who holds a restrictive covenant over the area can all change what you are allowed to cut.

Nuisance: When a Neighbour's Activity Crosses the Line

Sometimes the boundary problem is not about a physical object at all but about what a neighbour does that spills over: the dust and noise from their building work, a smell, or a garden that is so badly kept it becomes a health hazard. This is the common law of nuisance. The test is objective and well-established: the use must be unreasonable in the circumstances, and it must have a material effect on the use or enjoyment of your land. "I dislike it" is not enough; it has to be the sort of interference a reasonable person would find unacceptable. Nuisance is a fact-heavy area, and the fact that a use is normal (garden work, a home workshop) does not make it immune if it is carried out at unreasonable times or in an unreasonable way. A well-documented record — dates, times, photos, a diary — is your best evidence if it ever comes to it, and a neighbour who is genuinely out of line is often dealt with by a firm, factual letter rather than by litigation, which is why the earlier steps in this guide (documents, measurement, a written account) pay off here too.

Mediate, Survey, or Sue: Choosing Your Route

The honest advice, and the one that saves the most money and the most relationship, is that most boundary disputes do not need a court. The escalation ladder, in order, is this. First, the conversation: a calm, factual exchange with your neighbour, ideally with a plan in your hand showing where the boundary is. Most disputes end here, once the emotional fog clears and both sides can see the same picture. Second, mediation: a neutral third party (a professional mediator, or sometimes a local dispute service) who helps the two sides reach an agreement — usually a boundary agreement, a repair arrangement, or a payment — without the cost and heat of court. Mediation is fast, relatively cheap, and private, and it is genuinely the right tool for most boundary disputes, which are fundamentally disagreements about position and money rather than about legal right. Third, and only as a last resort, litigation: a claim in the county or high court for a declaration of the boundary, damages for the overhang or the nuisance, or an order dealing with a hedge or a tree. It is slow, expensive, and it can turn a manageable disagreement into a years-long adversarial fight, so it should be reserved for the disputes that the lower rungs have genuinely failed to resolve.

It is worth being clear about what each rung actually looks like, because people often overestimate how much they need the last one and underestimate how much they need the first two. A conversation works best when both sides are working from the same facts, which is why it pays to have the documents and a rough measured plan before you sit down — "I think the fence is here" is an invitation to argue, "here is where the title says the line is and here is where the fence actually stands" is the start of a solution. If that conversation breaks down, a mediation typically runs to a single half-day or full-day session (often over a few hours in total) with a neutral facilitator who keeps the discussion on the practical outcome rather than the argument about who was right. It is private, it is not a verdict, and nothing is binding until both sides actually agree, which means there is very little to lose by trying it before anyone spends serious money. The court route is genuinely the last step, and it is the one where the scale changes: a boundary claim is a formal matter, it will need evidence (your documents, a measured plan, possibly a surveyor's report and a solicitor's letter), and it is the kind of dispute that can run for a year or more before it is resolved — which is exactly why everyone will tell you to try the cheaper rungs first, and why they usually do.

One practical note that applies to all three routes: keep a written record. The date of every conversation, a copy of every letter or email, photographs of the fence, hedge or tree taken from both sides of the line, and a simple note of what was said and agreed. Boundary disputes live and die on evidence, and a tidy file is what separates a neighbourly disagreement you can walk back from one where, a year later, nobody can remember who said what and nobody's recollection matches. This costs nothing, takes a few minutes each time it happens, and it is the single most useful thing you can do to keep any of the three routes above manageable.

Where a party wall surveyor fits into this is as the person who settles the factual foundation of the dispute. Most of the problems above are, at their root, questions of where the line is and what the physical position is relative to it, and that is survey work, not legal work. A measured plan, a clear statement of the legal position from the documents, and an honest view of whether a claim (yours, or your neighbour's) has legs — that is what turns an "it's been there forever" argument into a settled picture, and it is what usually makes mediation possible in the first place. If your dispute has crossed from the garden into party wall territory — a shared wall, a new wall on the line, drainage at the boundary — the Party Wall etc. Act 1996 gives you a specific, workable way to deal with it, and building a new wall on the boundary line has its own guide. But for the ordinary fence, the hedge, the tree and the disputed strip of garden, the common law and a good measured plan are usually all you need.

Key Takeaways

• Establish the facts before you take a position. Get your title or deeds and a measured plan of the ground; the dispute is really about where the line is, and that is a question of fact, not opinion.
• A fence can sit wholly on one side of the boundary, astride it, or wholly on the other side — deed plans and the fence's relationship to the centre line of a party wall are typical ways to work out which — and there is no general legal duty on a neighbour to repair or replace a boundary fence unless a covenant or agreement says so.
• Adverse possession is a real risk and a real claim: long, open occupation of a strip of land can mature into a claim, and for registered land it takes the form of an application to the Land Registry that the true owner can object to. "It's been there forever" can matter — but the period is set by statute and a solicitor should confirm what applies to your land.
• You may cut a neighbour's branches and roots back to your boundary without permission (the cut material stays theirs), but check for a Tree Preservation Order or conservation area first — cutting a protected tree without consent can have serious consequences.
• A high hedge is dealt with under the statutory high-hedge scheme and the local-authority code of practice: talk, put it in writing, then approach the local authority and ask it to consider a complaint.
• Mediate before you sue. A conversation, then mediation, then — only if those fail — the court. The cheaper routes usually settle a boundary dispute without destroying the relationship or your money.

This is a guide to the common-law position on everyday boundary disputes, not legal advice. The law is fact-specific, and where a right genuinely depends on the documents or on a disputed line, a solicitor should confirm your position before you act — especially before cutting a tree or making an adverse possession claim. If your dispute involves a party wall or a new wall on the boundary, the Party Wall etc. Act is the framework that governs it, and a competent surveyor will be part of the solution.

Frequently Asked Questions

Who owns the fence between my garden and my neighbour's?

A fence can sit wholly on one side of the boundary, astride it, or wholly on the other side. Which of those applies — and therefore who owns it — is worked out from the deed plans (and any T-marks or fencing covenants on the title) and, where there is a party wall on the same boundary, from the fence's relationship to the centre line of that wall. It is not settled by who built the fence or who has been painting it. There is no general statutory duty on a neighbour to repair a boundary fence, so if it is decaying the law does not oblige them to replace it unless a covenant or agreement says otherwise. A surveyor can establish the physical position and a solicitor can confirm the ownership from the documents.

Can I cut branches or roots from my neighbour's tree that overhang or reach onto my property?

You may cut overhanging branches, and encroaching roots, back to your own boundary line, as a right at common law. You do not need your neighbour's permission to do so, but you cannot enter their land to do it, and the cut material still belongs to your neighbour, so it is courteous to offer to return it. The right is limited to what crosses the boundary; you generally cannot cut a healthy tree standing wholly on your neighbour's land simply because you dislike it, and you should check for a Tree Preservation Order before doing anything to a tree.

Can I claim my neighbour's garden by adverse possession?

Adverse possession is where someone occupies land that is not theirs for long enough to acquire title. The period is set by statute and depends on whether the land is registered, and for registered land it takes the form of an application to the Land Registry that the true owner can object to — so a solicitor should confirm what applies to your land. It is a difficult, fact-specific claim, and it is a reminder that a boundary that has been 'always been there' is not by itself settled. It is one of the reasons a surveyor and a solicitor are useful in a boundary dispute: to establish what the documents say and what has actually happened on the ground.

What Should You Do Next on Your Dispute?

If you are stuck in a boundary argument with a neighbour, the first thing that usually unblocks it is a measured picture of where the boundary actually is. We do this every week as surveyors across Greater London — we establish the physical position of your fence, hedge or wall relative to your title, and we will tell you, without jargon, where the law puts the line and what that means for your options, whether that is a simple written agreement with your neighbour, a mediation, or (as a last resort) a claim. If the structure in question is a party wall, we can also put you on the right statutory track with a proper notice — see how far in advance to serve a party wall notice — and, if needed, an agreed surveyor. Call us on 020 8150 3762 or get in touch for a free initial consultation, and we will help you get from "it's been there forever" to a settled, documented answer.