Cat Outdoor Enclosures: Catio Design Principles

Well-designed catios provide cats with safe outdoor access that meets welfare needs while protecting wildlife and keeping cats safe.

Key Facts

Catios range from small window boxes to large permanent outdoor structures
Key design elements include climbing shelves, resting hammocks, scratching posts, and weather shelter
Tunnels connecting the catio to a cat door provide access without requiring owner supervision
Solid or mesh flooring both have advantages — mesh allows grass access, solid reduces escape risk
DIY catio construction is accessible using basic materials and freely available plans
Catios eliminate the primary risks of outdoor access: traffic, predators, disease, and wildlife impact

Welfare Considerations

Catio design directly determines how well welfare needs are met. A small, bare catio without climbing opportunity, sheltered resting areas, or environmental complexity provides minimal welfare benefit beyond fresh air. A well-designed catio with varied heights, resting areas protected from weather and direct sun, scratch surfaces, and enrichment opportunities provides genuine behavioural enrichment. Adding a bird feeder outside the catio provides passive enrichment through wildlife observation. Connecting the catio to the home through a cat door gives cats agency over when they go outside — choice and control are important welfare components. Even small apartments can accommodate window catios that provide significant benefit.

What You Can Do

Design catios with multiple height levels, sheltered resting areas, and scratch surfaces
Include a weather shelter so cats can use the catio in rain and direct sun
Connect the catio to the house with a cat door to provide autonomous access
Add a bird feeder or water feature outside the catio mesh for wildlife viewing enrichment
Consider building or purchasing a tunnel system that extends catio access to more garden area