Yes. In most UK gardens, a normal shared boundary fence is a workable place for cat fencing on your side, provided the setup is secure and does not weaken the fence.
The part that causes confusion is usually not the cat fencing itself. It is working out who owns or maintains the boundary, whether the fence is sound enough to carry the system, and whether the finished height stays within the usual planning limits.
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QUICK ANSWER
Usually, yes.
If the fence runs along the normal boundary between your garden and the next one, cat fencing on your side is usually a practical setup. If the fence is clearly your neighbour's, ask before attaching anything to it.
Before installing, check three things: who the boundary belongs to or who is responsible for it, whether the fence is in good condition, and how high the finished boundary will be.
CLEAR UP THE MYTH
First, is it actually your fence?
There is one garden myth worth clearing up straight away: the fence on the left is not automatically yours, and the fence on the right is not automatically your neighbour's. [2]
Do not use the left-side or right-side rule to decide. HM Land Registry describes that as a common boundary myth and explains that every property and boundary is different. [2]
Title plans do not normally give you a millimetre-perfect legal boundary either. HM Land Registry says the great majority of registered titles show general boundaries, so the exact legal line is often not defined precisely on the plan. [1]
If your deeds or register clearly say who owns or maintains the boundary, use that information. If ownership or maintenance responsibility cannot be determined, HM Land Registry says the boundary feature is generally best treated as a party boundary. [1]
Shared boundary fence or clearly your neighbour's fence?
A normal shared boundary fence
This is usually a workable setup for cat fencing on your side. The important points are that the fence is sound, the installation is secure and the finished setup does not create a height problem.
A fence clearly belonging to your neighbour
Ask before drilling, screwing or otherwise attaching anything to it. Citizens Advice also advises that you cannot make changes to a neighbour-owned fence without their permission. [6]
If the ownership is genuinely unclear, check the property documents and talk to the neighbour before turning a simple garden improvement into a boundary disagreement. [1][6]
Should you tell the neighbour?
Yes, as a courtesy.
A quick heads-up is usually the easiest approach, particularly if the cat fence will be visible from their side.
It does not need to sound like a formal legal request when you are dealing with a normal shared boundary. Keep it simple: explain what you are fitting, that it will sit on your side, and that the fence will not be weakened or altered unnecessarily.
Citizens Advice recommends talking to your neighbour where there is a boundary issue and keeping a note of what you agree. [6]
A SIMPLE WAY TO EXPLAIN IT
“We are fitting a cat fence to our side of the boundary to keep our cat in the garden. The system will be fitted securely to the existing fence, and we will make sure the fence stays sound. I just wanted to let you know before we install it.”
Check the fence before fitting anything
A cat fence is only as useful as the boundary it is attached to. If posts are loose, panels are badly damaged or the fence is already unstable, deal with that first.
Planning Portal says fences, walls and gates do not generally require building regulation approval, but they must still be structurally sound and maintained. [3]
For the installation itself, the practical checklist is straightforward:
The fence is in decent condition.
Posts and panels are secure.
The cat-fencing system is fixed properly.
The installation does not make the boundary unstable.
The finished height stays appropriate for the location.
Does cat fencing on a shared fence need planning permission?
It can, depending on the finished height of the boundary.
Planning Portal gives the usual height limit as 2 metres for most boundaries and 1 metre where the fence is next to a highway, including the footpath alongside it. Above those limits, planning permission is required. [4][5]
2mMost boundaries
1mNext to a highway, including its footpath
That is why the type of system matters. A tall perimeter system can create a planning issue even where the original fence was fine.
The Safe Whiskers cat fence uses an inward overhang and is designed for most UK rear garden fences to keep the finished boundary within 2 metres, rather than relying on a very tall vertical barrier.
If you rent, the boundary question is only part of it. You should also get the landlord's permission before making changes to the fence or attaching a fixed system. [7]
For most gardens, you do not need to turn a shared fence into a complicated legal problem. Work through the basics in the right order:
Check the documents
Check what your property documents say about the boundary.
Ignore the side-of-garden myth
Do not rely on the left-fence/right-fence myth.
Ask when it is clearly theirs
If the fence clearly belongs to your neighbour, ask before attaching anything.
Give a quick heads-up
Give the neighbour a quick heads-up where the fence is shared.
Check its condition
Make sure the existing fence is sound before installation.
Measure the finished height
Check the finished height, not just the height of the original fence.
Once those points are covered, a shared garden boundary is usually a normal, workable place for a cat-fencing system.
Shared-fence FAQs
Do I automatically own the fence on the left?
No. The left-side/right-side rule is a common boundary myth. Ownership and maintenance responsibility depend on the individual property and its documents. [2]
Can I attach cat fencing if the fence belongs to my neighbour?
Ask first. If the fence clearly belongs to your neighbour, you should get their permission before attaching anything to it. [6]
What if nobody knows who owns the fence?
Check the deeds and Land Registry information first. Where ownership or maintenance responsibility cannot be determined, HM Land Registry says the feature is generally best treated as a party boundary. [1]
Should I tell my neighbour before installing cat fencing?
Yes, a quick conversation is sensible, particularly if the system will be visible from their side. It keeps the installation straightforward and gives you a chance to resolve any concern before work starts. [6]
Does the cat fence count towards the overall fence height?
Yes. When checking the planning height, look at the finished boundary once the cat-fencing system is installed, not just the original fence. [4][5]
THE BOTTOM LINE
A sound fence. A clear conversation.
If it is the normal boundary fence between two UK gardens, cat fencing on your side is usually a practical setup when the fence is sound and the installation is secure. Do not rely on left-versus-right folklore. Check the actual boundary information, speak to the neighbour where appropriate, and make sure the finished height works for the garden.
External references support the boundary, neighbour and planning guidance. Product links are for exploring a possible setup, not evidence for those rules.
