Quick answer: A washable cardboard cave is a sturdy box shell with a removable fabric cover made from remnants. Pick one simple shape, cut a single rounded entrance, sew or tie a cover in a fabric that matches the room, and add a cushion with its own washable case. Wash cover and cushion regularly and replace the box if it gets damp.
Cardboard caves are popular with cats and usually unpopular with people because they look like what they are. A fabric cover changes that. With a well-chosen remnant, a cave can look like a deliberate piece in a reading corner or bedroom, and the cover can come off for the wash.
This version focuses on design: shape, proportion and fabric. The cat beds and caves comfort hub links related builds, and if you want an enclosed bed with more structure, a budget cat bed under 40 uses similar ideas.
Choosing a Shape That Looks Intentional
Simple forms look most like furniture. A cube, a low rectangle with a pitched roof or a cylinder made from a curved sheet all work. Avoid odd angles and lots of flaps; they make the cover hard to fit and the piece look improvised.
Size it for the cat lying curled, plus room to turn. For an average adult cat, an interior around 40 centimetres wide and deep and 30 to 35 centimetres high is comfortable. Cut one rounded entrance, centred on the front or offset to one side, and sand or tape the cut edge so it is smooth.
| Shape | Look | Cover difficulty |
|---|---|---|
| Cube | Clean, modern | Easy |
| Pitched roof | Playful, house-like | Medium |
| Cylinder | Soft, organic | Medium |
| Low dome | Cosy, nest-like | Harder |
Building a Cardboard Cave Shell That Lasts
Use double-wall corrugated cardboard if you can find it, or double up single-wall sheets with the corrugations running in opposite directions. Join panels with brown paper tape on the outside so no sticky surface faces the cat. Fold in raw edges where possible rather than leaving them exposed.
Before using any box, remove plastic tape, staples and labels. Our tape, ink and staples safety guide lists what to strip off. For a quicker, bigger build, the design-forward cardboard castle from moving boxes uses the same shell technique.
Picking Remnants That Suit the Room
The fabric is the design. Take a cushion or curtain into the shop or look at the room before choosing. Tightly woven cotton, linen blends and canvas work well; they wash easily and do not snag claws. Avoid loose weaves, long-pile fabrics and anything with fringes or sequins.
Neutrals such as oatmeal, stone or charcoal fit most rooms. A remnant in a colour already used in the room, such as a cushion or rug, ties the cave in. A contrasting piping or a band of a second fabric around the entrance adds a finished look.
Making a Removable, Washable Cover
The cover should slip on and off without tearing the shell. Measure each face, add a seam allowance, and sew a simple box shape open at the bottom. Cut the entrance in the cover to match the shell, and finish its edge with bias binding. If you do not sew, wrap the shell like a parcel and secure the cover underneath with fabric ties.
- Measure the shell's front, back, sides and top.
- Cut fabric pieces with a seam allowance.
- Sew into a box shape, open at the base.
- Cut and bind the entrance hole.
- Slide over the shell; tie or tuck underneath.
Make the cushion separately, with its own zipped or envelope case, so you can wash it more often than the cover.
Cleaning Routine and Keeping It Dry
Wash the cushion case weekly and the cover every couple of weeks, or sooner if the cat sheds heavily or brings in dirt. Vacuum the inside of the shell between washes. Check the cat for fleas regularly too, as bedding is where flea eggs and larvae gather.
Cardboard and damp do not mix. The EPA stresses that water-damaged items should be dried within 24 to 48 hours to prevent mould. If the shell gets wet from a spilt water bowl or an accident, remove the cover, let the shell dry fully and replace it if it stays soft or smells musty. Keep the cave away from water bowls and windows that gather condensation.
Adding Comfort Inside the Cave
The inside should feel as considered as the outside. A firm foam pad cut to the floor size, wrapped in its own washable case, stops the cat feeling the cardboard base. Add a thin fleece on top in cold months. Avoid stuffing the cave with loose blankets; they bunch up, block the entrance and make the space feel smaller.
Some cats like a cave with a back window, a small round opening opposite the entrance that lets light in and gives a second view. Cut it high enough that the cat cannot use it as an exit unless you want it to, and bind its edge the same way as the entrance.
Scent helps a new cave feel familiar. Rub a soft cloth on the cat's cheeks and wipe it inside the entrance, or put in a blanket the cat already sleeps on. Leave the cave in place for at least a week before deciding whether the cat likes it.
Placing the Cave in a Designed Room
Put the cave where the cat already likes to sleep, then make it look like it belongs. A cave at the end of a bookcase, beside a reading chair or under a console table looks deliberate. Facing the entrance towards the room lets the cat watch from cover, which most cats prefer.
International Cat Care notes that cats like places to disappear from view as well as high spots. A cave meets the first need; pair it with a nearby shelf or window perch for the second. Our article on how many hours cats sleep shows why a good resting place matters so much.
If the cat chews the fabric or the cardboard, remove it. VCA warns that swallowed thread and other foreign bodies can be life-threatening. A cat that chews may need a sturdier bed. Our summer cooling cat bed guide shows how to adapt the cave with a lighter cover when the weather warms up.
When to Rebuild or Recover
Cardboard shells last months indoors if they stay dry. Replace the shell if it sags, if the corners crush, or if it smells after cleaning. Covers last much longer; keep the cover and make a new shell from the same template.
Remnant fabric often comes in odd lengths, so plan the cover before buying. A metre of a mid-weight canvas usually covers a cube cave with enough left for a cushion case. If the remnant is short, use it for the front and top, where it shows, and a plain cotton for the sides and back.
A second cover in a different fabric is useful. Swap them when one is in the wash, or switch from a heavier canvas in winter to a lighter cotton in summer. Keep the template in a folder so a new shell takes fifteen minutes.
If the cat also scratches the outside of the cave, add a small corrugated scratch pad near the entrance; our guide to cardboard safety covers choosing card for scratching too.
Washable Cardboard Cave Design Questions
What fabric is best for a washable cat cave cover?
Tightly woven cotton, linen blends and canvas work well because they wash easily and do not snag claws. Avoid loose weaves, long-pile fabrics, fringes and decorative trims a cat could chew. Choose a colour from the room, such as a cushion or rug, to help the cave blend in.
How do I make a cat cave cover without sewing?
Wrap the cardboard shell in fabric like a parcel, folding corners neatly, and secure it underneath with fabric ties or a drawstring. Cut the entrance in the fabric to match the shell and fold the edge inward. This lets you remove and wash the cover without tearing the cardboard.
How often should I wash a cat cave?
Wash the cushion case weekly and the outer cover every couple of weeks, or sooner if it gets dirty or your cat sheds heavily. Vacuum the inside of the shell between washes and check for fleas. Replace the cardboard shell if it gets damp or smells after cleaning.
Is a cardboard cat cave safe if it gets wet?
Not for long. Damp cardboard can grow mould, so remove the cover, dry the shell fully and replace it if it stays soft or smells musty. Keep the cave away from water bowls and windows that collect condensation, and use a washable cushion to protect the base.
