Outdoor Catio Setup: At a Glance
A catio (cat patio) gives indoor cats the best of both worlds: fresh air, sunshine, and stimulation — without the dangers of free-roaming.
Catio Cost by Type
Catio Type
| Catio Type | Size | Best For | DIY Difficulty | Key Features |
|---|---|---|---|---|
| Window Box | Small (2-4 sq ft) | Apartments, renters, single cat | Easy — weekend project | Attaches to window frame. Shelves, perch, shade cover. |
| Deck/Patio Enclosure | Medium (20-60 sq ft) | Homes with deck/patio, 1-3 cats | Moderate — 1-2 weekends | Uses existing structure. Multiple levels, climbing shelves. |
| Freestanding Aviary | Large (40-100+ sq ft) | Yards, multiple cats, ambitious DIYers | Advanced — 2-4 weekends | Walk-in size. Full-height. Can include plants, trees, water features. |
| Tunnel System | Variable (connects spaces) | Connecting house to catio, or catio to catio | Moderate | Overhead tunnels. Can span yards. Mesh or wire construction. |
| Portable/Pop-Up | Small (4-8 sq ft) | Renters, travel, supervised use only | None — ready to use | Collapsible. Not predator-proof. Supervised use only. |
Catio Safety Checklist
| Use 16-gauge galvanized welded wire — NOT chicken wire (cats can chew through) | |
| Bury wire 6-12 inches underground or use an L-footer to prevent digging | |
| Include a roof or overhead netting — cats can climb 6+ feet easily | |
| Provide shade, water, and a hiding spot — cats need escape from sun | |
| Ensure cat can ALWAYS return indoors — install a cat door or leave window open | |
| Use chicken wire — cats and predators can break through it | |
| Leave cat in catio unsupervised for hours without water or shade | |
| Use treated lumber with toxic chemicals where cats can chew or scratch |
The most important feature of any catio is a secure connection to the house so the cat can come and go freely. A cat that feels trapped outside will be stressed. A cat door or permanently open window (with secure screen) gives them control over their environment.
Never leave a cat in a catio unsupervised if you live in an area with coyotes, raccoons, large hawks, or loose dogs. Even sturdy enclosures can be breached by determined predators. Supervised outdoor time is always safest.
Outdoor Catio Setup: Safe Outdoor Time for Indoor Cats
The enclosure design decides whether it is actually safe.
petstore.comSetting up a catio your cat can actually use safely
The material that makes or breaks it
Regular window screen - a cat's claws or a raccoon can tear through it
Welded wire mesh or hardware cloth with paw-proof latches
Before your cat's first visit
Fresh air without the risks that come with an open door
Indoor cats that get supervised outdoor time tend to be more active and less bored than cats that never leave the house. The problem has always been the tradeoff: an open door or a free-roam yard also means traffic, other animals, and anything toxic growing nearby. A catio - a screened or wire-enclosed outdoor space attached to a window, door, or deck - is the setup that gives cats the first without most of the second.
The mesh you use decides whether it actually keeps your cat safe
Standard window screen is not strong enough to stop a determined cat or keep a raccoon out - welded wire mesh or hardware cloth is the material actually used in secure catio builds. Latches should be the kind a paw cannot accidentally flip open, and any gap where the structure meets the house needs to be sealed tight enough that nothing can squeeze through either direction.
What grows nearby matters more than most owners think to check
A catio puts a cat within reach of whatever is planted just outside, and a lot of common landscaping plants are toxic to cats. Before letting a cat use a new catio, walk the space and check every plant within paw or nose reach, not just the ones growing inside the structure itself.
Introduce it slowly, the same way you would any new space
The first few sessions should be short and supervised, with the door back to the indoor space always in view. Cats that are anxious about new environments often do better watching the catio from inside for a few days before going in. Once a cat is comfortable, most owners leave the catio accessible during the day and close it up at night, when predator activity is highest.
What veterinary and welfare guidance actually says
ASPCA guidance on cat safety recommends enclosed outdoor structures such as catios or supervised harness walks as a safer alternative to free-roaming outdoor access, citing risks from traffic, predators, disease exposure, and toxic plants. The ASPCA Animal Poison Control Center's plant list, the same database behind Petstore.com's toxicity checker, is the standard reference for which common outdoor plants are dangerous to cats.
We could not find an approved source that publishes specific catio dimensions, materials cost, or build specifications - those figures vary widely by region and materials, so treat any specific price or size number you see elsewhere as a rough estimate, not a standard.
Before your cat sets a single paw in a new catio, run any plant growing near it through our Toxicity Checker.