Five kinds of catio, and where each one fits

How the five types differ

The main difference is where the enclosure sits and how your cat reaches it. A window box extends from the building, a freestanding enclosure uses outdoor ground space, and a tunnel connects separate parts.

Installation effort also varies within each type. A partially assembled window enclosure still needs mounting work, while a lean-to built from plans involves cutting and framing rather than just assembling a purchased enclosure.

• Window: Suits a home with a usable window and permission to mount an enclosure. Habitat Haven includes a cedar plank floor and mounting hardware, but recommends at least two able-bodied people for installation; it is not a simple drop-in window accessory.
• Balcony: Suits an existing balcony only if the enclosure fits the opening and its attachment method is suitable. Check the fixings carefully: adhesive attachments can damage surfaces, and tension systems can shift or leave gaps. A no-drill label alone does not settle those questions.
• Freestanding outdoor: Suits a patio, deck, or yard with room for an enclosure. Humane World notes that many prefabricated models need a level surface and that freestanding models can use tunnel connectors. An uneven site may need preparation before assembly.
• Tunnel: Suits a layout where the enclosure sits away from the house or connects to other components. Habitat Haven tunnels arrive assembled, but the route and supports still need planning. A tunnel is a passage, not a substitute for the main enclosure.
• Lean-to: Suits space directly against the house and someone prepared for a DIY build. The Catio Company’s design has a solid back wall against the exterior wall. Its plans include a cut list and tool checklist; this is not a ready-made kit.

Three questions to narrow your choice

Use these questions to rule out unsuitable types before comparing individual products. A space that looks available may still lack a suitable mounting surface, a level base, or a workable access route.

Do not assume that a type name tells you how many cats it can accommodate. Compare the actual layout and usable space; Humane World notes that younger or more rambunctious cats may make more use of climbing structures and shelves at multiple levels.

• How much outdoor space do you control? Start with window or balcony options where ground space is unavailable. Consider a freestanding enclosure where you have a level outdoor area, or a lean-to where you have space against the house.
• May you attach anything to the building? Check with your landlord or association before choosing a mounting method. True no-drill installation means no holes or permanent marks, not merely replacing screws with adhesive.
• How many cats will use it? Check the chosen enclosure’s dimensions and shelf arrangement rather than relying on the category. If you need more usable space, compare larger enclosures before choosing a window box.

The five types side by side

Prices are the lowest and highest listed price among the products shown on each type page, copied from seller stores on Oct 9, 2026.