Regulations · 4 min read · Updated 6 November 2026
Cat-proof fencing and neighbours: boundaries, consent and cat law
Working out who owns the fence
There is no universal rule that you own the fence on your left or right. Your title deeds or the Land Registry title plan may show T marks indicating which side is responsible for a boundary, but many deeds are silent. Some fences are shared, and some were simply put up by whoever lived there first.
- Check your title plan for T marks or boundary notes
- Look at old sale paperwork or property information forms
- Note which side the posts and rails face, often a clue but not proof
- Ask the neighbour what they understand
Land Registry title plans usually show general boundaries only, so they rarely settle the exact line to the centimetre. For cat-proofing that is seldom a problem, because the question is usually whose fence it is rather than precisely where the boundary runs. If ownership is genuinely disputed, it is better to build on your own side than to argue it out.
When you need a neighbour's consent
| Situation | Do you need consent? |
|---|---|
| Toppers on a fence you own | No, but telling them is courteous |
| Toppers on a neighbour's fence | Yes, written agreement is sensible |
| Toppers on a shared fence | Yes, agree it together |
| Your own new fence or posts just inside your boundary | No, you are building on your own land |
| Brackets on a neighbour's wall | Yes |
Where consent is needed, a short email confirming what will be fitted, which side brackets will go, and who will maintain and remove them is usually enough for a straightforward job.
Your own fence line as an alternative
If the neighbour says no, or ownership is unclear, a common solution is to set posts just inside your own boundary and fix netting or toppers to those. This keeps everything on your land and avoids touching their fence. It does lose a few centimetres of garden, and you will need to think about how to stop cats squeezing between the two fences.
Height and planning
Cat-proof toppers add height to a fence. In many cases a fence and topper together up to 2 metres high in a back garden, or 1 metre next to a highway, fall within permitted development in England, but rules differ for listed buildings, conservation areas, flats and the other UK nations. See our separate planning guide for the details before going higher.
How UK law treats cats
- Cats are generally regarded as free to roam, unlike dogs and livestock
- Owners are not usually liable for a cat simply going onto a neighbour's land
- There is no legal requirement to keep a cat in your own garden
- Drivers are not legally required to report hitting a cat, unlike a dog
- In England, cats over 20 weeks must be microchipped since 10 June 2024
This means a neighbour cannot normally force you to fence your cat in, but it also means you cannot rely on the law if your cat is injured on a road. Containment is a choice owners make for their cat's safety.
Avoiding disputes
Talk to neighbours before work starts, especially if their side of the fence will see brackets or netting. Offer to show them the system and explain that it does not stop anything coming in from their side except cats. If they have a cat, some neighbours are keen to share the cost and cat-proof both gardens. Keep the work tidy and inside your boundary wherever possible.
What to agree in writing with a neighbour
For anything fixed to a fence or wall you do not solely own, a short written note protects both households and is useful if either of you sells. It does not need to be a formal legal document for a simple job.
- Which fence or wall the toppers or brackets will be fixed to
- Which side of the boundary any brackets, netting or rollers will sit
- Who pays for fitting and who maintains the system
- What happens if the fence needs replacing in future
- That either side can ask for it to be removed with reasonable notice
- Both names, addresses and the date
If the fence is replaced, toppers usually need to come off and go back on, so agree who covers that cost. When selling, mention any shared arrangement on the property information form if asked about boundaries, because buyers' solicitors often ask about structures fixed to boundary fences.
Frequently asked questions
Can my neighbour make me remove cat-proof toppers?
If the toppers are fixed to your own fence or posts on your land, and within planning limits, a neighbour generally cannot make you remove them. If they are fixed to the neighbour's fence without permission, they can ask for them to be taken down. Getting written agreement before fitting to any fence you do not own avoids this.
Does the Party Wall Act apply to cat-proof fencing?
The Party Wall etc Act 1996 mainly covers walls, including masonry garden walls standing astride a boundary, not ordinary timber fences. Fixing light brackets to a shared garden wall is unlikely to need a formal party wall notice, but you should still agree it with the neighbour. If in doubt, take advice before drilling into a shared wall.
Is it a legal requirement to microchip my cat?
In England, yes. Since 10 June 2024 owners must have their cat microchipped by 20 weeks old and keep their details up to date on a database, with fines possible for not complying. Microchipping is strongly recommended elsewhere in the UK too. It is a sensible backup even if your cat lives in a catio, in case it ever escapes.
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