GDLF Winter Cat Window Box – Cat Window Perch Catio with Windproof Cover & Door, Fits 24.3–38.8" Openings (Min Height 16")

Window Cat Perch Catio, Wood Cat Window Box, Window Catio for Indoor Cats. Suitable Single Hanging Window with an Inner Diameter of The Window Frame with A Net Opening Width of 24-35 in（White）

Acrylic Cat Window Box, Catio Window Box for Indoor Cats, for Sunbathing, Napping and Overlooking, Suitable for 24" - 35" Wide Vertical Windows, Natural Wood Color

Outdoor Cat Window Box, 43.3x25.2x47.2 inches Perch, Wooden Catio with Mesh Windows, Holds up to 55 lbs Cat

Cat Solarium-the Veranda Package the Ultimate Cat Window Box - Etsy

Window Catio Plans | MyOutdoorPlans

5 DIY cat window box plans you can try at home