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Existing Fence Conversion System Kit for Cats

Why Purr...fect Fence? For nearly 20 years and with more than 50,000 cats enjoying outdoors safely, Purr...fect Cat Fence is the most popular, effective, and durable cat containment system in the world. Our patented designs ensure that even the craftiest cats can't escape. Purrfect Fence cat enclosures are extremely flexible so they can be installed to an existing fence or wall and used in conjunction with our freestanding kit to enclose unfenced areas. Give your cats the freedom they deserve to enjoy the great outdoors without worrying about their safety! » See Testimonials

This item is currently on backorder. Esimtated ship date is on or before May 30, 2021. You are encouraged to place your order today to receive priority processing (up to 12 days faster). Be advised that order cancellations are subject to a 5% processing fee.

If timing is not a concern, you can leave your information here and we will notify you when this item is back in stock.

Cat Fence Topper for Existing Fences

The Existing Fence Conversion System's revolutionary Cat-Proofer™ extensions make it easy and affordable to convert most any 5' or 6' (or taller) fence or wall into a cat-proof barrier.

The pivoting fence extensions are attached near the top of the inside of your fence and the high strength mesh material is stretched between them attaching with the included zip ties. Simply secure the lower portion of the mesh material to your fence or wall and your cat-proof barrier is complete.

The system will adjust to fit just about every gate and corner situation making it very versatile. Included with each 100' kit are (12) Spring-loaded arms (12) Arm Mounting Plates w/ arm setscrew, 100' of 4' high heavy duty black poly fence (1.75" x 1.75" grid) and (100) zip ties (for 50 ft order increments it will include half of the listed components.) Keep in mind that every fence is different and there are no universally followed guidelines for post spacing, height, materials used,etc. A 50ft kit is designed for the average 50 linear feet of fence. 100 ft kit is designed for an average 100 linear feet of fence. A 200 ft kit is designed for the average 200 linear feet of fence. If you have gates, turns, short or long spans between posts then you may find that you need more or less components than comes with the kit. If in doubt, contact us first!

❗ Have a fence or wall under 5 feet? Use the Conversion System for Shorter Fences to cat-proof fences and walls as short as 3' high!

The system is built to last. All arms are galvanized steel with a black powder coat finish, the arm hardware and springs are stainless steel and the fence material is UV stabilized with carbon black and additional chemical UV inhibitors.

IMPORTANT: The fence mesh is the same 1.75" x 1.75" very strong poly material we use in our Free Standing System. - NOT a flimsy netting.

Accessories are available for, decorative aluminum, wrought iron, and PVC fences as well as walls. 2-Pack of Arms are also available. Please call us 888-280-4066 for custom orders or special needs.
What's Included

Download a Printable Version of the table list here.

Existing Fence Conversion System 50 Foot Kit 100 Foot Kit 150 Foot Kit 200 Foot Kit 250 Foot Kit 300 Foot Kit 350 Foot Kit 400 Foot Kit 450 Foot Kit 500 Foot Kit 550 Foot Kit 600 Foot Kit
Spring Loaded Arms 6 12 18 24 30 36 42 48 54 60 66 72
3 Ring Universal Mounting Brackets 6 12 18 24 30 36 42 48 54 60 66 72
Set Screws 6 12 18 24 30 36 42 48 54 60 66 72
4' 600lbs Break Strength Mesh 50 Feet 100 Feet 150 Feet 200 Feet 250 Feet 300 Feet 350 Feet 400 Feet 450 Feet 500 Feet 550 Feet 600 Feet
UV Rated Ties (bags) 1 1 2 2 3 3 4 4 5 5 6 6
Arm to Wall/Structure Hardware 2 Sets 2 Sets 2 Sets 2 Sets 4 Sets 4 Sets 4 Sets 4 Sets 4 Sets 4 Sets 4 Sets 4 Sets
Written Installation Instructions Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes

Download a Printable Version of the table list here.

- Fasteners for holding hardware to building/home are not included. Fasteners should be chosen based on the type of material covering the building/wall/fence (wood screw, masonry screw, etc.)

-The above table applies to orders placed after 12/26/19.


Items of note when planning your order/layout:

-Each existing fence is unique! The maximum span between arms is 12-14 feet. 8-10 Feet is preferred. Count and measure the distance between your posts to ensure that a kit will cover your fence.

- Keep in mind that our Existing Fence Conversion System will provide up to 12" inches of additional height from wherever the mounting bracket is secured. So, if the bracket is mounted at the top of a 6FT fence, then the finished Purrfect Fence height can be as tall as 7FT. This is adjustable and can be set at any height you prefer based on changing the height of the mounting bracket.

- Our patented system works by forcing your cat(s) to climb up the fence which activates the spring-loaded arm from the bottom if they are able to reach the top (most are not.) So, for maximum effectiveness, it is important that the finished height of your Purrfect Fence be tall enough so your cat cannot simply leap over it. For most domestic cats the minimum finished height (measured from the ground to the tip of the Purrfect Fence extension) we recommend is 6FT, though we prefer it to be taller when possible. Even so, we have had customers tell us it was effective for their cat(s) at shorter heights. However, higher is always better and may be necessary if your particular cat or cat breed is capable of leaping higher than the average healthy and athletic (domestic shorthair) cat. 

Fasteners for holding hardware to building/home are not included. Fasteners should be chosen based on the type of material covering the building/wall/fence (wood screw, masonry screw, etc.)

-Gates in your fence line require special consideration. Read below for more information on gate planning and installation.

Installation Instructions
Chain Link Fence Install Hardware 
PVC Fence & Walls Install Kit 

Installation Animation




Gates need to be considered separately for your layout plan. Each gate in your existing fence is likely to need additional components depending on the location and operation.

Inward Swinging Gate

Many inward swinging gates require 1-2 extra arm/bracket(s) per gate. Your situation may vary. If you have questions please contact us.

Outward Swinging Gate

Many outward swinging gates require 2-3 extra arm/bracket(s) per gate. Your situation may vary. If you have questions please contact us. 

Customer Reviews

Based on 184 reviews
Liberated! Me and my cats.

The system went up super easy. I was able to put it up in small yard in a couple hours. My cats used to try to escape over the fence every time they went out. Now they don’t even try. I feel comfortable enough to leave them outside without supervision. We are all loving the new found freedom.

Simple Installation and Safe!

It has been two weeks and my little kitties haven’t escaped, not even the chickens! I feel so much better to have the peace of mind knowing all my escape artists have met their match. Everything I did myself at 30+weeks pregnant except put up the bracket mounts because I do not own a drill and needed a friend to do that part.


The system worked pretty well for our needs.
Now my 3 cats stay safely outside.

Stupidly Simple

I'm not the best DIY gal. I'm okay at putting together a shelf with instructions and that's about it. This was very simple, if time/labor intensive for someone of my poor stamina, to put up. It works amazingly well. I also got the cat tree and it is a very sturdy outdoor tree. I haven't seen the cats use it, but it was late Fall by the time I put it up and it's cold out. I'm thinking of wrapping the pole in sisal rope to encourage my tree-climbing cat to give it a go. He's not used to such small platforms. Baring that I might need to try to get bigger platforms for the tree.

Ideal solution. Works perfectly.

Your fence gave us the freedom to go out with our cat. Before The fence she would jump the fence so quickly we had to react instantly to get her back safely. It was very discouraging. Now we have complete freedom and she stays safely in the yard.
AJ was incredible. Answering every question sending sketches with his best ideas etc.
thank you.

It works!

My cat was a little Houdini before I installed this fencing system. It’s been installed for a few months and there haven’t been any escapes! Excellent customer service too! Highly recommend.

Mr. Whiskers Loves His Freedom

Our cat, Mr. Whiskers, always enjoys going outside but we fear he may get hurt by cars or other animals. We purchased and installed the Purrfect Fence system. It was easy to install (took a weekend) and it works really well. Mr. Whiskers was quick to show us any gaps but after they were sealed, he now enjoys the back yard in all seasons and we can have peace of mind while he roams outside. The fence system is of good quality, and delivery is quick. When we needed replacement parts (due to a fallen tree limb) Purrfect shipped the parts quickly. The fence system is definitely worth the price.

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