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4 DIY Cat Door for Window Plans You Can Make Today (With Pictures)

Hallie Roddy

By Hallie Roddy

tabby cat going inside through glass cat door

How you choose to let your cat come and go is totally up to you. However, nobody wants to spend the entire day opening and closing the door because your cat can’t make up their mind! Even if you have a strictly indoor cat, it’s normal to feel the tiniest amount of guilt for not allowing your cats to experience the fresh air of the outdoors.

When you install a DIY cat door in your window, you get the best of both worlds. Your cats get to spend some time outside while still being safe, and you don’t have to use a good portion of your day letting them in and out.

The 4 Best DIY Cat Door for Window Plans

1. DIY Cat Door for Horizontal Sliding Window

Materials: Cat door, 4’ x 8” x 1” board, latex caulk, ½” thick weather stripping
Tools: Jigsaw
Difficulty: Easy

This cat door is ideal if your house has horizontal sliding windows. It often feels like there are fewer products made for these types of windows, and it forces you to get a little creative with your cat door. First, head to your nearest hardware store and pick up the necessary materials listed above. From there, the hardest part of the project is using a jigsaw to cut your board to fit your window. After that, all you have to do is add weather stripping and a pre-made cat door to give your cats full access to the outdoors.


2. DIY Window Box Catio

Materials: Wood, wire fencing
Tools: Jigsaw, screws, staple gun
Difficulty: Moderate

While you do have to purchase the plans for this specific catio, it is an amazing way to give your indoor cats some of the outdoor space they need. There is a good amount of work that needs to be done, but nothing that we don’t think is doable by someone with some basic carpentry skills. Additionally, you can make the outdoor box as big or small as you need. We’re sure that if you take the time to make this for your cat, they’ll start spending a majority of the summer months lounging out in the warm breeze and watching the birds and squirrels go by.


3. Custom Cat Door for Windows

Materials: Plywood, slats, wood sealer, screws, cat door with flap
Tools: Jigsaw
Difficulty: Easy

We love that this handcrafted cat door for windows is fairly easy to make using inexpensive materials. Depending on the height of your window, you may need to purchase some extra materials and make a post or ramp for them to use to get closer to the ground. However, it can be made for either vertical or horizontal sliding windows. This is for cats that have full access to the outdoors, but you can have it open up to an enclosed patio too.


4. Large Cat Patio with Window Access

Materials: Wood, wire fencing, tin sheet, cat door, screws
Tools: Jigsaw, staple gun, screwdriver
Difficulty: Hard

It’s possible for your indoor cats to have a good amount of space when you build them a custom patio with window access. The cat door gets installed the same way as the first DIY project in this article, but you can also add a bigger outdoor area where they can run, jump, and play. This gives your cats the feeling that they are outdoor kitties without exposing them to the dangers outdoors. What we love most about this patio is that the cats remain safe and that you can get creative and build as many shelves or towers for them to climb up as you need.

Related Read: DIY Cat Room Ideas–6 Plans You Can Make Today

Final Thoughts

Although there is nothing wrong with keeping your cats indoors at all times, and many vets would agree that it is much safer for them, there are still harmless ways to give them a taste of the great outdoors. Even if you do give your cats free range of the neighborhood, you still don’t want to have to get up from what you’re doing to let them in and out. Building a DIY cat door for windows is your best solution and a simple way to keep everyone in the household happy!

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Featured Image Credit: Nils Jacobi, Shutterstock

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