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Existing Fence Conversion System for Shorter Fences Kit

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 Fencing Topper for Chain Link, Wood, Vinyl

The Conversion System for Shorter Fences will allow you to add up to 3' overall to the height of your existing fence... Now you can use Purrfect Fence to Cat-Proof your fence or wall even if it is only 3' high!

❗ Have a fence or wall over 5 feet in height? Use the Standard Existing Fence Conversion System to cat-proof fences and walls 5' or higher!

The Conversion System for Shorter Fences will convert your shorter fence into a escape-proof fence for cats. The kits includes Cat-Proofer spring-loaded arms, extender for each arm, the associated mounting brackets and a 6' tall roll of fence based on the size of kit you choose.

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!

The extension tubes are made of thick 14 gauge steel (an arm set as high as possible on an extension tube can hold well over 50lbs). The scrunched end of the extension tube slides inside of the leg of the Conversion System Arms. The included high-strength epoxy bonds the pieces together. Once glued up, the extended arms slide into two mounting plates spaced a minimum of 4" apart secured to your fence posts with the top mounting plate set as high as possible on your post. Slide the arm to be at the desired height, tighten a set screw on each plate and your arm is secured to your post. Repeat this for all your posts and the fence material is ready to install.

Please note: If the fence is chain link, decorative aluminum or other metal picket fence you will need U-Bolts to secure the mounting bracket to the posts. You can use only one U-Bolt per bracket with this system so purchase one set of U-Bolts per post.

What's Included

Download a printable version of this table.

Existing Shorter 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 12 24 36 48 60 72 84 96 108 120 132 144
Set Screws 12 24 36 48 60 72 84 96 108 120 132 144
Extension Tubes 6 12 18 24 30 36 42 48 54 60 66 72
6' 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 2 3 4 5 6 7 8 9 10 11 12
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 this table.

- 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 your chosen kit will cover your fence layout.

- Keep in mind that our Existing Fence Conversion System for Shorter Fences will provide up to 36" inches of additional height from wherever the upper mounting bracket is secured. So, if the bracket is mounted at the top of a 4FT 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 between 12" and 36" above where the uppermost mounting bracket is secured.

- 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 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 any 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 any questions please contact us. 

Customer Reviews

Based on 74 reviews
Donna Schultz
Cats seem to feel safer

After a few missteps it is working purrfectly. It was more work to install than we expected, but the instructions were clear and understandable. We are very happy with it and think the cats are too.

Linda Raisovich-Parsons
Cats love being outdoors!

This is the best present I could have given my kitties. They love being able to explore their back yard and watch birds and squirrels. My Buttons will run full sprint, leaping with glee when let outside. I hear the song Born Free in my head every time I watch him. Neither of my cats have offered to try to escape their space. Although I had to install guards on a few trees located near the fence line so they couldn’t climb up the tree to leap over the fence. But overall it’s a winner with my Buttons and Buttercup and warms my heart to provide this freedom to explore for them. We love it. Best investment I could have made.

Eric Cripe
Cats happy, humans relieved

Having tried, and failed, to design and build diy fencing for our cats, we can say that cats are extremely good at escaping. Part of our specific problem is that we have a very difficult yard to fence in, with 3 terraced levels and mismatched fencing materials/heights, but proximity to predators and traffic made it mandatory (since we refuse to restrict our beloved cats to indoors-only). Frankly, had this not been possible, we would have sold our house and bought one in a quieter traffic area, so the purrfect fence actually saved us a great deal of time and money. Their staff designers gave us the plan, full install (by my wife and I) took about 3 days, which includes all of the fence patching and screening to plug holes, and now we have a 5,000 sq.ft. outdoors play area with trees to climb and mice to chase. When our new kitten gets bigger we plan to leave the cat door open at all times, so the yard becomes part of their living area - something we can do because in addition to keeping our cats in, these toppers/netting also keep predators (coyotes, mountain lions, foxes) out. This is absolutely the best option on the market for protection versus freedom for our loved ones. And as far as I can tell, Purrfect Fence is the only company doing it. We are glad we found them before we listed our house for sale!

John S
Secure environment, great service

The cats are no longer jumping over the fence or going under the fence. I feel comfortable letting my cats out knowing they are in a secure environment. Customer service was top notch.

Megan Alvarado

This is the best investment we have made as a responsible, loving cat owners! Our cats now have free roaming abilities in our backyard over looking the back hills! We opted for the shorter extensions for the chain link fence. For the 5ft white vinyl fence we added the normal extensions. This was a two man job and it took a few days to get it all up, we do have a large yard, but was pretty easy as far as instructions and how it all goes up.

Mary Meirow
Best investment ever

I have 2 indoor cats that have a 72 sf catio but still wanted to enjoy the yard. I put up parts of the existing fence, short fence, and freestanding fences from Purrfect Fence and my little boys couldn’t be happier! They are free to roam whenever I leave the catio door open into the yard.

Molly Mathews
The customer service is excellant!! AJ was right there every step of the waye to answer questions...

My cats took one look and realized they had met their match! The netting is hardly visible from a distance but up close is nice looking as well as effective.

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