Quick answer: An outdoor planter catio is a mesh-sided enclosure built into a planter or bench, so it looks like garden furniture. Build the frame from exterior-grade pine plywood, seal it with a pet-safe exterior finish, enclose every open side with welded mesh, plant only cat-safe greenery on top and connect it to a home office window so your cat can visit while you work.
A home office window that looks onto a garden or yard is a perfect spot for a small catio. Your cat gets fresh air and something to watch, and you get company during the working day. The problem is that many ready-made catios look like cages, and a cage outside your window is not what most people want to see on every video call.
A planter catio solves this. The enclosure is built into what looks like a raised planter or garden bench, with greenery on top and mesh sides that read as a trellis. This guide covers the build, the costs compared with buying and how to keep it safe.
Why a Planter Design Works
Cats Protection's article on whether catios are good for cats notes the benefits of giving indoor cats safe outdoor access. A planter design adds two things that matter in a garden: it blends into the garden, and the planting on top gives shade and something interesting to smell and watch. It is also small enough to sit under a single window, which suits a home office.
Planning an Outdoor Planter Catio Outside a Home Office
- Measure the window width and the height of the sill from the ground
- Check what is below the window: soil, paving or decking
- Decide on the length; most office windows suit 120 to 180 cm
- Plan a depth of about 60 cm, enough for the cat to turn and sit
- Check local rules and any lease or HOA restrictions
Materials: Pine Plywood and Mesh
| Part | Material | Notes |
|---|---|---|
| Frame and planter box | Exterior-grade pine plywood, 18 mm | Seal all faces and edges |
| Posts | Pressure-treated or naturally durable timber | Keep treated wood away from where the cat chews |
| Sides | Welded wire mesh | Stronger than garden netting |
| Roof | Planter box or solid panel | Shade and rain protection |
| Fixings | Exterior screws and staples | Stainless or galvanised |
Seal plywood with a pet-safe exterior finish and let it cure fully before the cat uses the space.
Assembling Posts, Rails and the Planter Roof
Build a rectangular frame from posts and rails. The planter box sits on top as the roof, with drainage holes and a liner so water does not drip through onto the cat. Fix mesh to the inside of the frame on every open side, stapling every few centimetres and covering the edges with timber battens so there are no sharp wire ends. Leave a hinged panel or door at one end for cleaning.
Assemble the frame square on a flat surface before fixing the mesh; a frame that is out of square leaves gaps at the corners that a determined cat will find. Measure both diagonals and adjust until they match.
Styling Details That Hide the Enclosure
The trick is in the details. Paint or stain the frame in the same color as other garden furniture, add a top rail that overhangs slightly like a bench, and use slim battens over the mesh in a trellis pattern. Plant trailing cat-safe herbs or grasses over the front edge of the planter, so it reads as a planter first and an enclosure second. Our IKEA hack outdoor catio tower shows similar styling.
Choosing Cat-Safe Plants
Only plant species that are safe for cats, as your cat may nibble anything it can reach through the mesh. Check every plant against the ASPCA's toxic and non-toxic plant list. Cat grass, catnip, valerian and some herbs work well. Our catio planter ideas and cat-safe houseplants list suggest more options.
Connecting the Catio to the Office Window
Fit a cat flap into a window insert panel, or use a short mesh tunnel from the window to the catio. If the window is high, add a ramp or steps inside. Make sure the cat can always get back indoors, and that the window cannot close on the tunnel. International Cat Care's guidance on fencing and enclosures stresses checking every gap an escape artist might use.
DIY vs Buying a Ready-Made Catio
| Option | Typical cost | Look | Time |
|---|---|---|---|
| DIY planter catio | Materials only, often moderate | Custom, blends in | A weekend or two |
| Ready-made window catio | Varies widely | Often cage-like | An afternoon to assemble |
| Custom-built by a carpenter | Highest | Fully bespoke | Weeks |
Building yourself usually costs less and lets you match the garden, but takes time and some tools. Our outdoor catio tower vs store-bought cost per year compares long-term costs.
Weatherproofing
Seal every face and edge of the plywood, including cut ends, and recoat each spring. Raise the base off the ground on feet or bricks so it does not sit in water. Give the planter a liner and drainage. Add a solid section of roof above the cat's main sitting spot so there is always a dry, shaded place.
Cut List for a 150 cm Planter Catio
| Piece | Qty | Size (approx.) |
|---|---|---|
| Corner posts | 4 | 5 x 5 cm, 90 cm tall |
| Long rails | 4 | 150 cm |
| Short rails | 4 | 60 cm |
| Planter base and sides (plywood) | 1 set | 150 x 60 cm base, 20 cm sides |
| Floor panel (plywood) | 1 | 150 x 60 cm |
| Welded mesh | 1 roll | Enough for three sides and the end door |
| Battens | 8 to 10 | 2 x 4 cm, cut to the frame |
Adjust lengths to your window. Cut all plywood first, seal the cut edges straight away and let them dry while you assemble the frame. Pre-drill every screw hole near a plywood edge to stop it splitting. Our cat-safe plants and indoor garden hub has planting plans sized for a box this length.
Shade, Shelter and Comfort
Put a shelf or bench inside at window height so the cat can watch the garden, and a covered box in one corner for hiding. On hot days, make sure part of the catio is in shade and bring the cat in during the hottest hours. In cold weather, limit visits or add a weatherproof insulated box.
Weekly Mesh and Frame Walk-Round
- Push and pull on every mesh panel weekly
- Check staples and battens for loose wire ends
- Look for gaps at the base and around the window tunnel
- Check plants are still cat-safe and not wilting into the enclosure
- Clean the floor and remove droppings from wild animals
Home Office Etiquette
A catio outside your office window means your cat may appear on calls. Position your desk so the catio is in view but not directly behind you. Keep the cat flap closed during important meetings if your cat likes to come and go noisily. Plenty of colleagues enjoy the occasional visit anyway.
Living With Neighbors
Keep the catio tidy, choose neutral colors and position it so it does not overlook a neighbor's garden directly. Check any local rules on structures near boundaries. Our outdoor planter catio after a move has more tips on fitting a catio into a new home.
Taking It Further
Once your cat is comfortable, you can extend the catio with a second planter along the wall, connected by a mesh tunnel. Our how to take an indoor cat outside safely guide covers other outdoor options, from harness training to supervised garden time.
Planter Catio Build FAQs
Can I build a catio from pine plywood?
Yes, if you use exterior-grade plywood and seal every face and edge with a pet-safe exterior finish. Raise it off the ground, give the planter section a liner and drainage, and recoat the finish each spring. Let the finish cure fully before your cat uses the space.
Is it cheaper to build or buy a catio?
Building a small planter catio yourself usually costs less in materials than buying a ready-made one of similar size, and you can match it to your garden. It takes more time and some tools. Ready-made catios are quicker to set up but often look more like cages.
What plants are safe to grow on a catio?
Cat grass, catnip, valerian and some culinary herbs are popular choices. Check every plant on the ASPCA's toxic and non-toxic plant list before planting, because your cat may nibble anything it can reach through the mesh. Keep toxic species well away from the catio too.
How do I connect a catio to a window?
Fit a cat flap into a window insert panel or use a short mesh tunnel from the window to the catio. Add steps or a ramp inside if the window is high, make sure the window cannot close on the tunnel and check every gap for escape routes.
