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How to Measure & Install Your Cat Window Insert (Step-by-Step Guide) Your cat deserves safe freedom without drafts or damage to your home. This...

Give your cat safe, draft-free outdoor access without drilling or permanent damage. Learn why a custom cat flap window insert is the best option for catios, winter weather, renters, and energy-efficient homes.

Cat Flap Fever™ custom cat window inserts are built for comfort, convenience, and cold weather. With a snug, draft-free seal and weather-resistant design, they keep your home cozy while giving your cat safe, independent access to the outdoors—even in freezing winters. Perfect for catios and enclosed spaces, they’re the ultimate solution for happy cats and warmer homes.

Want to give your cat safe outdoor freedom? Catios are the perfect solution—and Cat Flap Fever’s custom cat window inserts make them even better. Most of our customers use their inserts to connect directly to a catio or enclosed outdoor space, giving cats safe independence while keeping homes draft-free and comfortable. Designed in the cold winters of Chicago, our inserts work in any weather, fit any window, and even come in larger flap sizes for big cats and small dogs. Discover why catios and Cat Flap Fever are the ultimate combo for happy pets and stress-free pet parents.

Help your cat live a longer, healthier, and happier life with proven wellness tips. From balanced nutrition and vet care to safe outdoor access and enrichment, discover simple daily habits that support your cat’s overall health and joy.

When you picture your cat happily hopping through a cat window insert, you probably imagine freedom, independence, and hours of feline fun. But let...

Tired of being your cat’s doorman? Our custom cat window inserts let your feline come and go with ease. Safe, weather-resistant, and designed just for your home—Cat Flap Fever makes cats (and their humans) happier.

Avoid my mistake and skip the expandable or wood base versions of the cat door for the window. Our door is custom built to sit in your window tracks. We use premium materials, and we build your door right here in the U.S. We're an American small business, and we offer old-school customer service. We love talking with our customers, and we take great pride in our product and our customers relationships. Measuring is simple, and our doors usually ship within 3 to 5 days. Thank you for supporting small business. You'll be so glad you did! 

Solution for feral cats living outside.  Give them safety with a cat door for the window.  

Discover how to safely provide fresh air for indoor cats through enclosed spaces, window cat doors, and custom catios. Create the perfect enriched environment for your feline friend!

Discover common cat anxiety triggers and learn how strategic window door placement can create a calming environment for your feline friend. Reduce stress and improve your cat's well-being today!

Unlock Feline Freedom: The Ultimate Guide to Cat Doors Cat doors have revolutionized the way our feline friends experience the world. These ingenio...