What You Can Build Instead of Buying

You can build a litter box enclosure from plywood, a storage bench, a cabinet, or even a bookshelf—materials you likely have access to or can buy for less than a finished pet furniture piece. The goal is to hide the box from view while giving your cat straightforward entry and exit, and giving you room to scoop without moving the whole structure.

Most DIY builds fall into three types: a wooden box with a door or opening cut into one side, a repurposed storage bench with the litter box inside, or a cabinet with a cat door installed in the front or side. Each takes between two and six hours of work, depending on whether you're cutting wood from scratch or modifying something that already exists.

Key Takeaways

  • A basic wooden enclosure requires plywood, a saw, wood glue, screws, sandpaper, and paint or stain—all available at hardware stores for under $100.
  • Your cat needs an opening at least 6 inches tall and 8 inches wide to enter comfortably, and the interior must be tall enough that litter doesn't spray out when your cat digs.
  • Ventilation holes drilled into the top or sides reduce odor buildup and keep the box from becoming a damp, smelly space.
  • A removable or hinged top panel makes scooping easier than a front-only opening, because you can reach the entire box without bending awkwardly.
  • Sand all edges and corners smooth before your cat uses the furniture, and use non-toxic wood stain or paint so fumes don't linger.

Measuring Your Space and Your Cat's Needs

Start by measuring the litter box itself—length, width, and height when filled with litter. Add 2 inches to the length and width for movement space inside the enclosure, and add 4 inches to the height so litter dust and spray don't hit the top. If your box is 18 inches long, 12 inches wide, and 10 inches tall with litter, your interior enclosure should be at least 20 inches long, 14 inches wide, and 14 inches tall.

Measure your cat from nose to rump while standing normally—that's the minimum length your opening needs to be. The opening height should be at least 6 inches, and ideally 8 inches, so your cat doesn't have to crouch to enter. A cat that's 16 inches long needs an opening at least 16 inches wide; a smaller cat can use a 12-inch opening. Write these numbers down before you buy materials.

Check the space where you plan to put the furniture. Measure the floor area, the height of nearby walls or shelves, and whether the enclosure will block a doorway or heating vent. A litter box enclosure works best in a corner or against a wall, away from your cat's food and water bowls.

Building a Basic Wooden Box Enclosure

A straightforward four-sided box with a removable or hinged top is the easiest DIY project. You'll need one sheet of 3/4-inch plywood (4 feet by 8 feet), a circular saw or table saw, wood glue, 1 1/4-inch wood screws, sandpaper (80-grit and 120-grit), and a drill with a screwdriver bit.

Cut the plywood into five pieces: two sides, a back, a bottom, and a top. Use your measurements from the previous section to set the width and height of the sides and back. The bottom should match the length and width of the sides. The top should be slightly larger—about 1 inch wider and longer—so it overhangs and sheds water if the box is ever near a window or damp area.

Assemble the box by explore wood glue to the edges where pieces meet, then driving three screws through each joint. Start with the two sides and back, then attach the bottom. Leave the top unattached for now. Use a jigsaw or hole saw to cut the cat door opening into one side panel, about 2 inches up from the bottom. Sand the edges of this opening smooth with 120-grit sandpaper so your cat's fur doesn't catch.

Drill four to six ventilation holes (1 inch diameter) into the top panel, spaced evenly. These holes let odor escape and prevent moisture from building up inside. Sand all exterior surfaces with 80-grit sandpaper first, then 120-grit, to remove splinters and rough spots. Attach the top with two hinges on the back edge so you can lift it open to scoop, or leave it removable so you can set it aside entirely.

Repurposing a Storage Bench or Cabinet

If you have an old wooden storage bench, ottoman, or cabinet, you can convert it into a litter box enclosure in under an hour. Remove any shelves or dividers inside, then measure the interior space to make sure your litter box fits with 2 inches of clearance on all sides.

Cut or drill a cat door opening into the front panel, following the same sizing rules as above—at least 6 inches tall and 8 inches wide. Use a jigsaw for a rectangular opening or a hole saw for a circular one. Sand the edges smooth. If the bench or cabinet has a solid top, drill ventilation holes into it. If it has a removable lid or cushion, you can leave it as is for easier access when scooping.

Line the interior bottom with a plastic sheet or old shower curtain to protect the wood from moisture and urine. Trim it to fit, leaving the cat door opening clear. This liner also makes cleanup easier—you can pull it out and wipe it down without scrubbing the wood.

Finishing and Safety Steps

Once the structure is built, sand all surfaces one more time with 120-grit sandpaper. Pay special attention to the cat door opening and any edges your cat will brush against. Splinters can catch fur and cause small cuts.

explore a non-toxic wood stain or paint. Water-based polyurethane stains and paints are safer than oil-based ones because they release fewer fumes as they dry. explore two thin coats rather than one thick coat, and let each coat dry completely—usually 4 to 8 hours—before explore the next. Open windows while the furniture dries to let fumes escape. Don't put the litter box inside until the smell is completely gone, which can take 24 to 48 hours.

Before your cat uses the enclosure, run your hand over every surface, edge, and corner. If you feel any roughness, sand it smooth. Check that the cat door opening has no sharp splinters or protruding screws. Make sure the top or hinged panel closes securely so it won't fall on your cat's head.

Placement and Odor Control

Place the enclosure on a level floor away from your cat's food and water bowls—cats naturally avoid using the bathroom near where they eat. If the floor is uneven, use shims (thin wooden wedges) under the legs to level it so litter doesn't shift inside the box.

Add a mat or tray under the cat door opening to catch litter that sticks to your cat's paws as it exits. A rubber boot tray or a piece of linoleum works well. This mat also protects your floor from moisture if the litter box is near a wall or corner where spills can seep into baseboards.

Ventilation holes in the top reduce odor, but you can improve air circulation further by drilling a few small holes (1/2 inch) near the bottom of the back panel, opposite the cat door. This creates a draft that pulls odors out. Don't block these holes with furniture or walls—leave at least 6 inches of open space behind the enclosure.

Common Mistakes to Avoid

The most common mistake is making the cat door opening too small. A cat that has to squeeze to enter will often refuse to use the box and will go elsewhere in your home. If your cat is hesitant, measure the opening and enlarge it by 1 to 2 inches. You can always make an opening bigger, but you can't make it smaller without rebuilding.

Another mistake is sealing the enclosure too tightly. Without ventilation, moisture and ammonia smell build up quickly, making the box unpleasant for your cat and your home. Always drill holes in the top or sides, and avoid caulking or sealing gaps completely.

Don't use toxic wood treatments, varnishes, or paints. Your cat will rub against the inside surfaces and may lick them. Stick to water-based, non-toxic finishes labeled safe for pet furniture or children's toys. If you're unsure, leave the wood unfinished—bare wood is safer than a finish you're not confident about.

Finally, don't make the enclosure so tall or deep that you can't reach the entire litter box when scooping. You'll be tempted to skip scoops or leave the box dirty, which encourages your cat to go outside the box. A removable or hinged top is worth the extra 30 minutes of building time.

Frequently Asked Questions

How much does it cost to build a DIY litter box enclosure?

A basic wooden box built from plywood costs $40 to $80 for materials—plywood, screws, glue, sandpaper, and finish. If you repurpose a bench or cabinet you already own, the cost is just the cat door hardware and finish, usually $10 to $20. Buying a finished litter box furniture piece typically costs $150 to $400.

Can I use MDF or particle board instead of plywood?

MDF and particle board are cheaper and easier to cut, but they absorb moisture and urine much faster than plywood. If your cat has an accident or the box leaks, the material swells and falls apart. Plywood is worth the extra cost because it lasts years longer, especially in a damp bathroom or basement.

What if my cat refuses to enter the enclosure?

Start by making the opening larger—many cats balk at small openings. Leave the top off or propped open for the first week so your cat can see inside and doesn't feel trapped. Place a familiar blanket or toy inside. If your cat still avoids it, move the enclosure to a different room or try a different entry style, like a top-opening design instead of a front opening.

Do I need to use a cat door, or can I just leave the top open?

You can leave the top open or hinged, but a cat door opening in the side keeps litter contained better and hides the box more completely. A top-opening design is easier for you to scoop but less visually concealed. Choose based on what matters more to you—convenience or appearance.

How often should I clean the inside of the wooden enclosure?

Wipe down the interior with a damp cloth once a month to remove dust and odor buildup. If you lined it with plastic, pull out and rinse the liner weekly. Sand any rough spots that develop over time. A well-maintained enclosure lasts five to ten years before the wood shows significant wear.