This isn’t mischief. It’s work—invisible work. Your cat is conducting its daily inspection of its home.

If that home is designed for it, it’ll stay calm all morning. If not, neither of you will have a good day.

Your Cat’s Idea of "Home" Is Different from Yours

You see your apartment as a series of rooms: bedroom, living room, bathroom, kitchen. Your cat does not.

To a cat, its living space is a 3D map. As noted in Wikipedia’s Cat intelligence entry, cats have well-developed spatial awareness—they actively memorize every height, path, and hiding spot in their environment [S1].

But unlike humans, cats prioritize the vertical dimension. In the wild, felines navigate a three-tiered space: the ground for walking, shrubs for observation, and trees for escape. Urban apartments flatten this into a single plane. The result? Your cat is starving—not for food, but for dimensional space.

Ohio State University’s Indoor Pet Initiative (a veterinary project focused on indoor animal welfare) outlines a minimum configuration for indoor cats: five essentials—litter boxes, scratching posts, resting areas, perches, and toys [S4]. These aren’t decorations; they’re the foundation of feline mental health.

Below, we break down each of these five details, explaining the why and the how.

5 Design Details for a Cat-Friendly Home

Detail 1: Vertical Space—Give Your Cat a "Second Route"

Why: When stressed, a cat’s first instinct is to go up. In the wild, climbing a tree means safety. In an apartment, if it can only move horizontally, it’ll hide under the sofa—often the dirtiest dead zone in the home.

How to do it:

• Provide at least one vertical height difference: a windowsill, the top of a bookshelf, or a cat tree. Pick one.
• Ideally, give your cat at least two independent routes to its high perch. If it wants to jump from point A to B, it should have a backup path in case the first is blocked.
• A budget-friendly but effective solution: stack IKEA Lack side tables to create a staircase, with each step 40 cm high. Add a towel to each for traction—voilà, a proper "cat staircase."

Detail 2: The "3+1" Rule for Litter Boxes

Why: Cats are pickier about litter box placement and quantity than you might think. The Ohio State project recommends the "N+1" rule: if you have N cats, you need N+1 litter boxes [S4].

But what about single-cat households? You still need two. Your cat might reject one for reasons like noise, a narrow entrance, or frequent human traffic. What looks like pickiness is often a sign: "I don’t like that box."

How to do it:

• Quantity: 1 cat = 2 boxes (one as a backup); 2 cats = 3 boxes.
• Location: Quiet, out of the way, never next to food bowls (cats instinctively avoid eliminating near their food).
• Entry: Open-top (top-entry boxes look sleek but many cats dislike them). Avoid covered boxes—they can feel stifling.
• Size: The box should be at least 1.5 times the length of your cat. If it’s too short, your cat may reject it and urinate elsewhere.

Detail 3: Scratching Posts—Location Matters More Than Height

Why: Cats don’t scratch for fun. It’s a territorial marking behavior—both visual (scratch marks) and chemical (scent glands in their paws). If the scratching post is in the wrong place, the marking fails, and your cat will turn to the sofa.

How to do it:

• Place it near where your cat is already scratching. If your sofa is the target, don’t put a new post in another room. Place it right next to the sofa so your cat can "switch" its scratching location.
• Height: Tall enough for your cat to stretch fully. If it’s too short, your cat will scratch downward.
• Material: Sisal rope is best. Carpet-wrapped posts are too soft and lack resistance—cats lose interest.
• Quantity: 1 cat = at least 2 posts (one horizontal, one vertical), placed in the two rooms where your cat spends the most time.

Detail 4: A Window Perch—But Make It Safe

Why: Wikipedia’s Cat entry includes a lesser-known reference: ASPCA issued a warning in 2005 about the dangers of high-rise falls for cats [S3]. Cats have a strong instinct to chase flying insects, birds, or falling leaves. That "close" ledge on the opposite building, balcony, or air conditioning unit? Your cat will jump.

So the goal isn’t to "open the window for your cat to enjoy the view." It’s to create a safe perch by the window.

How to do it:

• Install a protective screen or pet-proof net—don’t wait until it’s too late.
• Place a soft-padded window perch (IKEA sells dedicated cat window shelves) where your cat can lounge for hours.
• Vertical blinds are better than roller shades—cats enjoy batting the slats, which can satisfy some of their scratching urges.
• If your apartment faces south, consider a catio (cat patio)—a enclosed balcony where your cat can sunbathe safely without the risk of falling.

Detail 5: Hiding Spots—Give Your Cat a "Do Not Disturb" Corner

Why: Cats don’t always want to be seen, held, or petted. They need a place where they can completely disappear for a while—this is crucial for dopamine regulation [S1].

As noted in Wikipedia’s Cat behavior entry, cats will actively seek out a safe "refuge" after a stressful event, staying there for 15–30 minutes before reemerging [S2]. Without this refuge, they may remain in a state of mild stress, leading to excessive meowing, over-grooming, or increased aggression.

How to do it:

• Never place a litter box in a hiding spot—cats see litter boxes as "bathrooms," not "bedrooms."
• A semi-enclosed cardboard box is often enough. Cats generally prefer boxes that are just slightly larger than their bodies.
• If your furniture is open-concept (minimalist style), at minimum provide a window nook with a curtain, or the interior of a high cabinet.
• Avoid placing cameras, sensors, or smart speakers in hiding spots. If your cat realizes the space isn’t safe, it will find a new one.

What Not to Do

Here’s the reverse checklist—if you’re doing any of these, your cat will protest in its own way:

• Don’t use air fresheners, diffusers, or essential oils—cats have limited liver metabolism. Citrus and mint oils, in particular, are toxic to them.
• Don’t place food bowls next to litter boxes—as mentioned earlier.
• Don’t dress your cat in clothes—unless a vet has prescribed it post-surgery. Cats find this extremely stressful and can’t regulate their body temperature properly.
• Don’t play background music all day—cats hear three times better than humans. Prolonged noise can cause chronic stress.
• Don’t lock your cat in a cage for "training"—short-term use is fine, but long-term confinement can lead to serious behavioral issues.

One Final Thought

You might think: Some of these details are already in my home—they’re just in the wrong place.

That’s the key. The secret to a cat-friendly home isn’t what you add—it’s where you put it. A $20 scratching post in the right spot is ten times more effective than a $200 cat tree in the wrong one.

The Ohio State project is so widely recommended by veterinarians because it keeps things simple: Cats don’t need luxury—they need logic. A cat that can live comfortably in your home is the one that helps turn your apartment into your shared home.

This is the most underrated part of indoor cat care: Space is a kind of food.

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References

• [S1] Wikipedia: Cat intelligence
• [S2] Wikipedia: Cat behavior
• [S3] Wikipedia: Cat (includes ASPCA high-rise fall warning)
• [S4] Ohio State University, Indoor Pet Initiative (cats)
• [S5] International Cat Care (iCatCare): Creating a cat-friendly home