Trees on a boundary: ownership, severance and consent

A tree belongs to whoever owns the land its trunk stands on at ground level. Not where the branches reach, not where the roots run, and not where the shade falls. If the trunk sits wholly on your neighbour's side of the boundary then it is their tree, even where two thirds of the canopy overhangs your garden. Where the trunk straddles the line, the long-standing common law position is that the tree is owned jointly by both, and neither owner can lawfully fell it without the other's agreement.

That last situation is the one that goes wrong, because people assume a planning consent settles it. It does not.

Where ownership is determined by the trunk position

Ownership follows the land, and the tree is treated as part of the land its trunk occupies. Check the position on the ground rather than on the title plan, because title plans are drawn at a scale that cannot resolve a 600 millimetre trunk against a boundary line, and the Land Registry's general boundaries rule means the red line is indicative rather than precise.

Three practical consequences follow for a householder.

You have no right to fell, top or substantially reduce a neighbour's tree, however much nuisance it causes. What you have is the common law right to abate an overhang by cutting back branches to the boundary line, without notice, provided you do not trespass to do it and do not damage the tree's health unreasonably. The same right applies to roots that cross the line.

Cut material remains the property of the tree's owner. The polite and correct course is to offer it back. Tipping it over the fence is a trespass, which sounds pedantic until the relationship has already broken down.

And where the tree causes actual damage, such as subsidence from root activity, liability in nuisance can attach to the tree's owner once they are on notice of the problem. Root ingress into drains follows similar reasoning and is covered in trees and drainage: soakaways, sewers and root ingress.

Trees straddling a boundary and joint ownership

A trunk crossing the boundary creates shared ownership of the whole tree, not a notional division down the middle.

The effect is simple and inconvenient. Each owner can abate the overhang on their own side. Neither can carry out works that would destroy the tree or materially alter it as a whole. Felling a jointly owned tree without the other owner's consent exposes you to a claim, and the measure of damages is not the firewood value.

Establishing whether a trunk straddles the line is a surveying question. Where it matters, commission a boundary survey showing the trunk outline at ground level against the physical boundary features, and record it photographically with a scale in shot. On an old hedge line with a bank and ditch, or where a fence has been replaced in a different position, the physical features may not sit where either party assumes.

Multi-stemmed trees complicate it further. Where a stool sits on the boundary and stems emerge on both sides, the measurement point matters, and the root protection area calculation for development purposes changes with it, as set out in root protection area for a multi-stem tree.

Where ownership cannot be resolved, treat the tree as jointly owned and get written agreement before doing anything. That is both the safe position and the inexpensive one.

Consent needed from each owner for works

Two consents operate independently, and confusing them is the single most expensive mistake in this area.

Planning consent for works to a protected tree is permission from the local planning authority that the works may be carried out without breaching the tree protection regime. It is not permission from the owner, and it confers no civil right whatsoever.

Owner consent is a private law matter. Without it, carrying out works is trespass and damage to property regardless of what the council has authorised.

So a householder holding written consent from the authority to fell a protected boundary tree, with no agreement from the joint owner, holds a document that protects them from one consequence and not from the other. Felling in that situation is unlawful on the civil side and the authority's consent is no defence to it.

Reverse the position and the same logic applies. The neighbour's enthusiastic written permission to fell is worth nothing if the tree is protected and no consent has been obtained.

Protected trees and who may apply

Anyone can apply to the local planning authority for consent to carry out works to a tree covered by a Tree Preservation Order. You do not have to own the tree.

The application form asks whether the applicant owns the tree and, where they do not, expects the owner to have been notified. An authority can and often will contact the owner before determining it, and an owner's objection is a material consideration even though it is not determinative.

Trees in a conservation area that are not covered by an order are dealt with differently. A notice under section 211 of the Town and Country Planning Act 1990 has to be given to the authority at least six weeks before the works, and the authority can use that period to make an order. That notice can also be given by someone who is not the owner.

Replacement obligations follow felling in both regimes, and they bind for longer than most people expect. Tree replacement conditions and how long they bind you covers the duty, and where works have already happened without consent, responding to an allegation of unauthorised tree felling sets out what to do next.

Dead trees and those presenting an immediate risk of serious harm are treated as exceptions in both regimes, with notice requirements attached. Those exemptions are narrower than they sound and the burden of proving them sits with whoever carried out the works, so photograph and record the condition first and take advice from an arboriculturist before relying on them.

Access rights to carry out works

There is no general right to enter neighbouring land to carry out tree works, even works you are entitled to do.

Three routes exist.

Agreement, which is the sensible one, recorded in writing with dates, scope, insurance and a make-good obligation.

The Access to Neighbouring Land Act 1992, which allows an application to the court for an access order where works are reasonably necessary for the preservation of the applicant's own land or buildings. The Act expressly covers the treatment, cutting back, felling, removal or replacement of a tree or hedge that is damaged, diseased, dangerous, insecure or dead. The court can attach conditions and require a payment for the privilege, so it is a last resort rather than an opening move.

Working entirely from your own side, which is what most abatement amounts to in practice, using a platform or a climbing approach that does not cross the line, including at height. An arborist's boots on your side and their saw on the neighbour's side is still a trespass.

Party wall and scaffold overlaps

Tree work rarely happens on its own, and two adjacent regimes catch people out on boundary sites.

The Party Wall etc. Act 1996 does not apply to trees. It does apply to excavation within three metres of a neighbouring structure to a depth below its foundations, and within six metres where a line drawn down at 45 degrees from the foundation would meet the excavation. On a boundary site those excavations are frequently inside a tree's root protection area, so the party wall notice and the arboricultural method statement end up describing the same hole from two directions. Reconcile them before either is served.

Scaffolding that oversails a boundary needs the neighbour's licence. Scaffolding on or over a public highway needs a licence from the highway authority under the Highways Act 1980. Neither is automatic and both take time.

For a development scheme, the tree survey and arboricultural impact assessment should record off-site trees and their ownership on the constraints plan, because a proposal that depends on works to a tree the applicant cannot lawfully touch is a proposal with a hole in it. Authorities routinely condition the protection of third-party trees.

Recording agreement before works start

Write it down, even with a neighbour you get on with. The agreement that prevents a dispute is short.

1. Which tree, identified by a tag number or a dimensioned plan, with photographs.
2. The works, described in arboricultural terms with a specification rather than as a reduction by some proportion.
3. Who holds the authority's consent, with the reference number, or confirmation that none is required and why.
4. Who is paying, and for which elements.
5. Dates of access, hours of working and the extent of land to be entered.
6. The contractor, with evidence of public liability insurance at a stated level and relevant qualifications.
7. What happens to the arisings.
8. Make good, covering lawn, planting, paving and fences.

Keep a photographic record before, during and after, with dates. An agreement between neighbours does not bind a future owner of either property unless it is drafted as a deed and protected on the title, so where a long-term arrangement matters, such as a continuing right to maintain a shared hedge, take advice on documenting it properly.

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This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.