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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


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.

a video thumbnail of man installing cat fenceAccessories 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.)

-As the table above shows, a 50-foot kit comes with 50 feet of fencing material, not 60 feet.  A 150-foot kit comes with 150 feet of fencing material. It is advised that you consider ordering approximately 10% or more than you need to allow for cut pieces and minor errors in installation.

-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


YouTube video



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 339 reviews
So pleased my cats are safe!

I can't believe how well the Purrfect Fence works to keep my agile cats safely in my yard. After one of my cats was hit by a car in front of my house, I have been struggling with the decision to make my cats indoor or outdoor cats. With the new fence, they get both!

Carol and the Greyt Hounds
It's greyt

Had a young stag hound who could jump our fence. We used the cat fence because of the hinged supports. Worked like a charm. Figured she wouldn't be able to climb either due the hinge and she couldn't.

Mayra Aviles

This has been a life changer. I’m so glad I finally got this existing fence conversion system. It also helps keeping neighborhood cats out which was causing my male cat to spray. It was easy to install and customer service was so helpful and supportive with all my questions. Thank you!

Sylvia B.
Purrfect fence is the BEST!

My cats are super happy and absolutely love it now that they go out in the backyard! When they were exclusively indoors, I used to play with them everyday to avoid behavioral issues but now, they chase insects, butterflies, and an occasional squirrel so I don’t have to play with them that much anymore. They also fight less with each other. I think they appreciate being able to go out because they’re definitely a lot cuddlier with me now. LOLOL

Purrfect fence gives me peace of mind that my cats are safe and can’t escape. At first, I was concerned about the price and how it would look. Turns out it looks good! Installation wasn’t a problem and the price was worth it! The Purrfect fence team was also very helpful and responded back quickly whenever I have questions (and I did have a lot) lololol.

All-in-all, my cats and I are very happy with the fence and I wish all cat parents would get it for their indoor cats! :D

Kevin Rhoades
PurrFect!! Kitties are so happy!

We’ve had our PurrFect fence up for over a month now and our two kitties are loving it. They are more active than ever and we have the confidence it will continue to keep them in the yard. The system is super flexible too. I was able to install just under 300 feet around obstacles such as small trees and trellises without issue. I couldn’t be happier and neither can Lulu and Poppy.

Laura Aronson
I’m relieved, they can’t escape.

I have cats that want to be outdoor cats more than anything. I put up the fence conversation system which safely allows my cats to be outside all the time. With the exception of the corners, it was easy to put up. The system is well worth it, I have 2 very happy cats enjoying the backyard.

It really is PERFECT

Not only is my pet safe from jumping onto the wall of our yard, but strays and coyotes won't jump down into it. It seems they recognize it as a barrier or trap for them. Live in the desert and we've seen coyotes run the length of our block wall definitely provides us with a secure and safe place for our boys.

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