I built a DIY cat litter box from a plastic storage tote, and the cost difference compared to store-bought options really adds up over time. This project takes about an hour from start to finish and runs just a few dollars in materials. If you want to know how to build one that fits your cat’s size perfectly, here’s what I did.
Start by picking a plastic container—I used a standard 40-quart storage tote that measures roughly 24 inches long by 16 inches wide. You’ll want something sturdy enough to hold up with regular use, but not so large that it takes up half your bathroom. The container becomes the main shell, so choose one with smooth sides and no cracks.
Next, measure and mark where you’ll cut the entrance hole. I made mine about 3 to 4 inches high from the bottom edge, positioned toward one corner so litter stays contained in the opposite end. This height works well for most adult cats while keeping litter from spilling out onto your floor. Use a drill with a hole saw bit to start the opening, then carefully cut down with a utility knife to create the full entrance. Sand the edges smooth with medium-grit sandpaper so your cat won’t get splinters or scrapes.
Line the inside with a plastic trash bag or litter box liner to protect the tote from moisture and scratches. Add your litter—I usually go with 3 to 4 inches deep—and your box is ready. The whole setup lasts several years before the tote shows real wear, and if it does eventually crack, you just replace it with another inexpensive container rather than dropping money on a new commercial box.
Choose Your Container Type for a DIY Cat Litter Box
Why spend money on expensive commercial litter boxes when you’ve probably got a plastic storage tote sitting in your closet. I realized this myself when I started my DIY project, and honestly, it works just fine.
Large plastic containers like Honest Kitchen ten-pound boxes make a solid litter box foundation. You’ll want to choose a container that fits your space and matches your cat’s size. The best part is that you’re recycling something you already own instead of buying something new.
Once you’ve picked your container, the next step is planning the entrance cut. I measured about 3–4 inches high for the opening, keeping it wide and low so my cat could easily walk in and out without any trouble. This opening size works well for most cats and prevents litter from spilling out when they move around. Getting this measurement right matters because it sets up everything that comes next, especially when you add edging reinforcement to keep things sturdy.
Gather Materials Based on Your Container Choice
Now that you’ve picked your container, let’s line up the materials you’ll actually need before cutting starts. A sharp box cutter or blade is your main tool here, and I’d grab duct tape to reinforce edges that tend to fray or tear during use. Grab a tape measure too—I learned the hard way that measuring twice takes one minute, while cutting a hole too big takes way longer to fix.
What you grab next depends on your container choice. Plastic totes need less muscle than harder boxes like Samla containers. For plastic, your box cutter usually handles it fine. For thicker plastic or rigid boxes, you might need a Dremel tool or a hacksaw to get clean cuts. Safety goggles are optional but worth it if you’re uncomfortable with small plastic shards flying around while you work.
Container Selection Options
Starting a DIY cat litter box really comes down to finding the right container, and I’ve learned that large plastic totes work better than anything else I’ve tried. You’ve got some solid options to pick from, and the choice depends on what you’re working with at home.
An 18-gallon plastic tote gives you decent space without being too bulky to handle. The Ikea Samla box measures 31×22.5×7 inches and has a flat bottom that’s genuinely easier to work with than rounded sides. I prefer flat-bottomed containers because they sit stable and give me better access when I’m cutting the entrance hole. That flat surface also matters later when you’re setting up litter and dealing with inevitable spills.
For kittens, go smaller with sides just a couple inches high so they can climb in and out easily. Adult cats need something sturdier with 4–5 inch sides to keep litter contained when they dig. Whatever box you choose, look for one with straight edges rather than curved ones, since they’re simpler to cut and more stable overall.
Essential Tools And Supplies
Once you pick your container, gather the right tools and materials to build this litter box. I grabbed a sharp blade and duct tape because those two items handle most of the work. A measuring tape and marker help you plan your entrance so your cat can fit through comfortably.
For hard-sided containers, a rotary tool or hacksaw makes cleaner cuts than struggling with just a knife. These power tools give you straighter edges and less fraying on plastic or metal.
Safety gear isn’t optional. Grab goggles and knife-proof gloves because your hands need protection when cutting sharp container edges. One slip with a blade can cause real damage, so cover yourself before you start.
Stock up on the supplies that go inside once you’re finished building: litter, potty pads, and optional liners. Having everything ready before you cut your first hole makes the actual building process faster and less frustrating.
Measure and Mark Your Cut Lines
Now I’m marking where I’ll cut. This step really matters because a litter box that’s too shallow won’t hold litter, and one that’s too hard to get into will just sit unused.
I’m keeping things simple with straight lines and right angles that I can actually cut without messing up. The key is leaving at least three and a half inches of plastic below the opening so litter stays inside the box instead of ending up on your floor.
The height of the opening depends on your cat. Kittens need a lower entrance, while bigger or more athletic cats can handle something taller. Once I’m done, I want at least three inches of litter depth in the finished box, so I’m measuring from there and working backward to figure out where my cut line should go.
Litter Depth Requirements
Litter Depth Requirements
I spent way too much time fussing with litter boxes before I figured out that getting the depth right actually makes everything else easier. Once you nail this measurement, the rest of your build falls into place pretty naturally.
Here’s what works. You want at least three inches of litter sitting in the bottom of your box—that’s deep enough that your cat can dig and cover their waste properly without kicking it everywhere. From there, plan your entrance opening to sit about three and a half inches above that litter surface, which gives your cat enough headroom to get in and out without scraping their back on the rim.
The reason the sequence matters is simple: your litter depth determines exactly where you’ll cut that opening. Once you’ve locked in those measurements, the actual cutting becomes straightforward because you know your marks. Make sure your entrance stays wide enough that you can fit both your cat and your scooping hand through comfortably—I usually go with a clean right-angle cut that gives you about four to five inches of width. When you measure first and cut second, you avoid a lot of frustration.
Opening Height Specifications
Once you’ve decided on your litter depth, it’s time to figure out where that entrance hole actually goes. I measure three and a half inches up from the bottom of my litter box—this keeps litter from spilling out while still letting my cat hop in without any trouble.
Before I touch a blade, I sketch the opening dimensions lightly with pencil. I plan for a wide, low entry that matches my cat’s actual size and how she moves. Drawing it out first saves me from cutting mistakes that would be pretty annoying to fix later.
Once I’m happy with my entrance outline, I grab a sharp blade and carefully cut along those lines. The real work comes after—I sand every edge smooth because rough edges mean potential scrapes for my cat. Some people add duct tape along the edges for extra protection, and I do this too. This step is what actually makes a rough DIY litter box feel safe and functional.
Simple Right Angles
Why do I stick with right angles instead of fancy curves. Straight lines just work better for a litter box—measurements stay honest, cuts come out clean, and edges don’t trap your cat’s paws. That’s what I’m walking you through here.
I grab my tape measure and start by marking a baseline along the material I’m working with. Then I mark my cut lines with a marker, making sure every corner hits exactly 90 degrees. Before I pick up the saw, I double-check that opposite edges line up perfectly and all corners are actually square. No curved edges means no jagged spots that could catch fur or skin.
This method gets rid of the guesswork. Stick to 90-degree angles throughout, and your rectangular edge profile stays stable and safe without any complicated geometry getting in the way.
Cut the Entrance and Lower the Sides
Your cat needs a way to actually get into this thing, so let me walk you through cutting the entrance and lowering the sides. These are the two steps that make the whole project work.
Your cat needs a way to actually get into this thing—cutting the entrance and lowering the sides are the two steps that make it work.
I start by sketching out where I want the entrance to go, then I ask my cat to leave the room so I can focus. Using a sharp blade, I cut a wide, low opening that works for any cat—including older ones who don’t move as quickly or bend as easily. The entrance should be maybe 4 to 6 inches wide and positioned low enough that your cat barely has to crouch to get in.
Next comes lowering the sides. For kittens, I cut down about 2 to 3 inches from the top. For bigger or adult cats, I go for 4 to 5 inches. This gives them comfortable clearance without making the box feel too open and exposed.
Here’s the part that keeps your cat safe. After cutting, I sand down all the rough edges or run duct tape along them, both on the inside and outside of the box. Sharp cardboard edges can cut paws or fur, so this matters. I also tape over any seams or folded edges along the bottom that might be weak. A few strips of duct tape on the inside corners keeps everything stable and protects your cat from splinters while they’re using the box.
Sand and Reinforce All Cut Edges
How many times have you caught yourself on a sharp edge and wondered how something so small could hurt so much. Your cat probably feels the same way, so this step matters.
I’m sanding all the cut edges smooth and then reinforcing them with duct tape. Here’s what I’m doing:
Sand every cut edge on both the inside and outside surfaces. This removes the jaggedness that can snag skin or fur. I’m using medium-grit sandpaper (around 120-150 grit) and taking my time with the corners and folds where edges tend to be sharpest.
Once the edges feel smooth to the touch, I’m applying duct tape over every single cut edge. This adds a layer of protection and makes the box more durable. I’m wrapping the tape around the edge so it covers both sides, pressing it down firmly as I go.
For the bottom folded edges and any spots that feel weak or thin, I’m taping thoroughly to reinforce them. These areas take the most wear during cleaning and daily use, so extra reinforcement here prevents problems later.
For any rough or exposed edges that the tape doesn’t fully cover, I’m using epoxy putty or cord cover to seal them off. This takes a few minutes but keeps everything smooth and safe for your cat.
I’m finishing all of this before I add any liners or litter. That way there’s nothing sharp to catch on during regular cleaning or if your cat bumps against the sides while using the box.
Add a Liner and Set Up the Litter
Now that you’ve got those sharp edges handled, let’s make this box actually work for your cat. I’m going to walk you through the liner and litter setup that keeps things functional and clean.
Now that sharp edges are handled, let’s make this DIY box actually work for your cat with the right liner and litter setup.
I start by laying down a potty pad on the bottom—I trim mine to fit snug against the cardboard walls. This matters more than it sounds because cardboard soaks up everything over time, and the pad acts as a moisture and odor barrier that keeps the box from falling apart after a week or two.
Once the pad’s in place, I add a lightweight layer of litter on top, keeping it shallow to prevent spillage and so the whole box stays stable. If your cat loves to scratch and dig like mine does, anchor that potty pad with small pieces of duct tape so it doesn’t bunch up and shift around during use. Just tape it in a few spots—you don’t need to go overboard.
This setup combo actually extends how long your DIY box lasts. The liner keeps moisture from breaking down the cardboard, and the minimal litter layer means less mess and more time before you need to rebuild the whole thing.
Customize for Your Cat’s Size and Mobility
Once you’ve got that pad and litter sorted, you’ll want to step back and think about who’s actually going to use this box—because a setup that works great for a five-pound kitten is going to feel cramped and awkward for a fifteen-pound adult cat. I’ve learned that the details really matter when it comes to your cat’s comfort.
Litter box size: Three-week-old kittens need just a couple inches of side height, while adult cats require four to five inches or taller. If you’re shopping, measure your cat from the ground to their hip when they’re standing—that’s roughly the height you’re aiming for.
Sturdy container selection: I use Honest Kitchen boxes for kittens because they’re lightweight and easy for tiny paws to navigate. Larger cats deserve reinforced storage totes that won’t collapse under their weight or shift around when they dig.
Entry height and accessibility: Wide entrances with low lips really help. If your cat is older or has joint issues, a lower entry means less strain when they’re stepping in and out.
Edge reinforcement: I tape all jagged edges inside and outside the box, using duct tape on weak spots. It takes an extra fifteen minutes but keeps your cat safe from cuts.
