Cat-proof fencing

About 720 Australians a month look for a way to make an existing fence hold a cat, and it is a reasonable thing to want: the yard is already there. Fencing is a different mechanism for the same problem an enclosure solves, with a different failure mode and one legal complication nobody selling it mentions. Some councils will not accept a fence as containment at all.

Council instruments and prices checked 12 September 2026

Whether a fence can satisfy the rule at all

Of the 68 councils in our register, 48 impose a containment duty, and 12 of those state no hours at all, which in practice means the duty runs around the clock. The important split for fencing is not how strict a council is. It is how its law defines wandering at large, and that single definitional choice decides whether a fence is enough.

Two councils in the first group are the ones that catch people out, because a cat sitting unsupervised in its own fenced backyard is already offending. One of them goes further and requires climb-proof construction by name. Buying a topper there solves a problem the law is not asking about.

The opposite case is worth stating just as plainly, because fencing is often dismissed too fast. Surf Coast Shire Council's order is a 24 hour curfew whose wording is "a 24-hour cat curfew. This means that residents must always keep their cats within their property boundary". Its own guidance says the cat may be in the front or back yard or in an enclosure: the obligation runs to the property boundary, not to indoors. Where the rule reads like that, a fence that genuinely holds is a complete answer and costs far less than a structure.

And where a jurisdiction defines containment itself, the definition governs. In the ACT the wording recorded against the territory-wide duty is: "confined to their keeper's or carer's premises at all times (Act, s 84AN); ACT City Services states 'Containment means keeping your cat on your premises 24 hours a day'". Read that against a fence and the question stops being whether the fence is good and becomes whether the cat is on the premises, every hour of every day.

The four mechanisms, and what defeats each

Every cat-proof fencing product works by removing the grip or removing the launch. Cats climb by digging claws into a vertical surface and pulling up over a top edge, so each approach attacks a different part of that sequence.

Three failure modes are shared by all of them, and they are the reason fencing is a build rather than a purchase. The first is the launch point: containment is set by the highest thing a cat can reach near the boundary, not by the fence. The second is the gate, which moves, so it cannot carry a continuous topper without extra work. The third is the neighbour's side: most systems keep your cat in but do nothing to keep other cats, or a dog, out.

What it costs, and what we can honestly say

We do not publish a price for fence toppers or rollers, because our product register holds none. The register covers finished enclosures, runs, tunnels and mesh from the sellers we could source and verify, and not one of them lists a fencing kit we could record a price against. Rather than repeat a figure from a vendor page we could not check, we leave it blank and say so.

The one fencing-adjacent figure we can stand behind is the mesh. Bunnings' aviary mesh at 12 x 12mm works out at about $7.38 per square metre of mesh, computed by us from its published roll size, and it is the tightest aperture we found there. An inward-angled topper made from it is the cheapest cat-proofing in this category by a wide margin, and it is also the one most likely to be built wrong: see what Bunnings stocks for the aperture problem and the zinc treatment its own page recommends.

Fencing is really competing against a structure, so the comparison worth making is against the floor of that market. The cheapest roofed enclosure we could price anywhere is the Catnets Trek Portable Cat Enclosure 1.78m at $260, and the cheapest floor area per dollar is the Catnets Quad 3.6m x 3.6m Portable Cat Enclosure at $86.42 per square metre. Freight is extra and unpublished on almost every seller. If your fence line is long, fencing wins on cost easily. If it is a small courtyard with three launch points, an enclosure is often cheaper than doing the fence properly, and it is certainly easier to get right.

What nobody publishes, here as everywhere

The specification gaps that run through this whole category apply to fencing too, and the second one matters most for a topper. No seller in this market publishes a wind rating of any kind: not one product in our data names AS/NZS 1170.2, a wind region, or a speed. A netted top edge on an exposed boundary is a sail, and there is no published basis for choosing between products on it. UV is nearly as thin: exactly one brand in our data publishes a quantified weathering result, a netting strength-retention test, and everyone else offers adjectives.

So test the two things you can test. Walk your own boundary and mark every object within a cat's jump of the top rail, because that list decides whether any of this works. Then look at your council's actual instrument rather than its summary page, since at least one council in our register publishes a page that overstates its own law.

If fencing is not the answer

A freestanding enclosure sits inside your boundary, needs no agreement with a neighbour, and satisfies every containment instrument in our register rather than only some of them. The options and what they cost are in the enclosure comparison and price per square metre. If the yard itself is what you want to keep, netting is the closest thing to fencing that also closes the airspace. Whether any structure needs approval is a separate question again, covered in building approval.

General information only, not legal advice. Every row here was read from the council's own published local law, order or policy page, or from the state or territory Act itself, on the date shown in the row's checked field. Local laws change, orders are remade, and several of the orders below have commencement dates still in the future. Before you rely on any of this for your own cat, confirm the current position with your own council and read the instrument named in the row. If a row and your council disagree, your council is right and we are wrong.

Common questions

Will a cat-proof fence satisfy my council?

It depends entirely on how your council's instrument defines the duty, and the two shapes are genuinely different. Where the law requires only that the cat not leave the land, a fence that works discharges it, and 3 councils in our register read that way. Where the law requires the cat to be in a proper enclosure at all times while on the property, a fence does not discharge it however good it is, and 2 councils read that way. Read your own council's instrument before spending money on fencing to satisfy a rule.

Do fence rollers actually work?

The mechanism is sound: a free-spinning tube on the top rail gives a climbing cat nothing to hook a claw into, so it rotates away under the paw. What defeats it is geometry, not the roller. Anything a cat can launch from above the roller line, a shed roof, a carport, a wheelie bin, a mature tree, a neighbour's pergola, bypasses it entirely. Corner posts, gate posts and pergola junctions are where most systems leave a gap, and a cat will find the one you did not finish.

Is electronic or invisible containment an option?

Not everywhere, and one council in our register says so explicitly: Gold Coast City Council's subordinate local law expressly excludes electronic containment from what counts as a proper enclosure. That is worth knowing before buying a system, because a buried wire that is legal in one local government area may not satisfy the containment duty in the next one. It also does nothing to keep other animals out.

Can I fit a topper to a fence I share with a neighbour?

That is a fencing law and a neighbour question rather than a cat question, and it varies by state. A shared boundary fence is usually jointly owned, so attaching hardware to it is not unilaterally yours to decide, and rental agreements and body corporate by-laws add their own layer. A freestanding enclosure that sits inside your own boundary avoids the argument entirely, which is one of its quiet advantages over fencing.