Quick answer: A high-sided litter pan DIY stays fresh because it has no lid: air moves freely over the litter while the tall walls stop kicked-out litter and spray. The routine that keeps it that way is simple. Scoop at least daily, top up to a shallow depth, wash it weekly with unscented soap, and replace scratched plastic.
A large storage bin with one side cut low is one of the most popular litter projects, and for good reason. It gives a cat more room than most bought trays, the high walls catch scatter, and because it stays open on top it avoids the trapped, ammonia-heavy air that builds up under many hoods.
Those advantages only last if the pan is cleaned properly. This guide is about the routine once the pan is built: what to do every day, every week and every month, and what to use so the cat keeps choosing it.
Why Open High Sides Ventilate Better
Urine breaks down into ammonia over time, and in a closed box that gas collects at exactly the height of a cat's nose. An open pan with tall sides lets the gas disperse into the room, where normal ventilation removes it. The walls still do the job most people buy a hood for, stopping litter flying out during digging and urine reaching the floor from cats that stand tall.
The ASPCA lists a hood or liner the cat finds uncomfortable among the reasons cats avoid the box, which is another reason the open design works for many cats. If you are still deciding on the build, our guide to ventilated litter enclosures compares open and enclosed options.
The High-Sided Litter Pan DIY Cleaning Schedule
| When | Task | Time |
|---|---|---|
| Every day | Scoop clumps and solids; check the entry edge for wet litter | 2 minutes |
| Every day | Top up litter to the usual depth | 1 minute |
| Every week | Empty, wash with unscented soap or baking soda, dry fully, refill | 15 minutes |
| Every week | Wipe the floor and wall around the pan | 3 minutes |
| Every month | Check plastic for deep scratches, cracks and stains | 2 minutes |
| Every few months | Replace the bin if scratches hold odour | One new bin |
The ASPCA advises that you scoop at least once a day and rinse the box out completely with baking soda or unscented soap once a week. Cats Protection goes further, advising you to remove poo and pee twice a day and fully clean the tray at least once a week in hot, soapy water. More cats in one pan means scooping more often, not less.
Daily Scooping, Done Properly
- Scoop from the bottom so whole clumps lift without breaking.
- Run the scoop along the walls; high sides collect urine clumps that stick.
- Check the low entry cut for wet litter carried out on paws.
- Bag waste and remove it from the room rather than leaving it nearby.
- Level the surface and top up.
Keep a scoop and a roll of bags on a hook beside the pan so the job takes seconds. Daily scooping is what does most of the work against smell; washing alone cannot make up for missed days.
The Weekly Wash
Tip the old litter into a bag, then wash the empty pan in hot water with unscented soap, or scrub with baking soda and rinse. Pay attention to the corners and the cut edge, which can trap litter dust. Dry the pan completely before refilling; damp plastic under fresh litter turns clumping litter into a paste.
- Avoid ammonia-based cleaners. Urine contains ammonia, and the ASPCA warns that cleaning with it can draw a cat back to urinate in the same place.
- Avoid strong perfumes and scented sprays, which can put cats off the tray.
- Rinse well so no soap residue remains.
- Wear gloves, and wash hands afterwards.
Litter Depth and Type in a Deep Pan
Tall walls tempt people to pour in a lot of litter. Cats generally prefer a shallow layer: the ASPCA suggests one to two inches, and Cats Protection suggests around 3 cm. Deeper litter does not hide smell; it hides old clumps, which break up and spread odour through the whole pan.
Most cats prefer fine, unscented, clumping litter. If you change type, mix the new litter into the old over a week or two.
Plastic Wear and When to Replace the Pan
Scratches in plastic hold urine and bacteria that washing cannot reach. Run a fingernail across the floor of the pan each month. If it catches in grooves, or the plastic stays cloudy and smells even after washing, replace the bin. Storage bins are cheap, which is one of the strengths of this build.
Also check the entry cut. A rough or cracked edge can catch fur or paws. Sand it smooth, or cover it with a split length of flexible tubing pushed over the edge.
Placing the Pan So It Stays Clean
Position matters as much as washing. Put the pan somewhere quiet, away from food, water and the cat's bed, and avoid noisy spots such as next to a washing machine. Leave space around it so air can move and you can reach every side with the scoop. A washable mat at the entry catches most of what paws carry out; our exit path mat system shows a layout.
For more ideas on keeping smell down in small homes, see apartment litter odour fixes that work and our hidden litter box ideas cats still use.
Build Details That Make Cleaning Easier
A few choices at the building stage save minutes every week. Pick a bin with smooth inside walls and rounded corners, because ribs and sharp corners trap clumps. Choose a light-coloured or clear bin so you can see stains and missed clumps. Cut the entry on a long side rather than a short end so the scoop reaches every corner, and keep the cut wide enough for the cat to step in without jumping.
- Smooth walls and rounded corners.
- Light colour to show dirt.
- Entry cut sanded smooth or edged with split tubing.
- No lid kept on the bin, even loosely.
- A second identical bin, so one can dry while the other is in use on wash day.
Adjusting the Routine for Several Cats
Each extra cat adds waste and shortens the time before smell builds. In a two-cat home, scoop twice a day if both share a pan, and wash the pans on alternate days of the week so there is always a freshly cleaned one available. Place pans in different spots rather than side by side, so one cat cannot block access to both.
If a cat starts avoiding the pans despite a good routine, Cornell Feline Health Center explains the medical and behavioural causes of house soiling and why a vet check should come first.
Signs the Routine Is Not Working
- The cat perches on the edge instead of stepping in: the litter may be dirty or too deep.
- Urine outside the pan: check cleanliness first, then see a vet, as this can signal a health problem.
- A strong smell within hours of cleaning: scratched plastic or too few pans for the number of cats.
- The cat hesitates at the entry: the cut may be too high for an older or stiff cat.
The ASPCA recommends one box per cat plus one extra. Our news guide on why cats pee outside the litter box covers medical and behaviour causes, and how often to clean a litter box goes deeper on timing.
Litter Pan Cleaning Questions
How often should I clean a DIY high-sided litter pan?
Scoop at least once a day and top up the litter. Once a week, empty the pan, wash it with hot water and unscented soap or baking soda, dry it fully and refill. Scoop more often if several cats share the pan.
Does a high-sided pan smell less than a covered box?
It can, because the open top lets ammonia disperse into the room instead of collecting under a hood at the cat's nose height. The high walls still catch scattered litter. Smell control depends mainly on daily scooping, though, so the design only helps if you keep up with cleaning.
What should I clean a litter pan with?
Hot water with unscented soap, or baking soda, then a thorough rinse. Avoid ammonia-based cleaners, which can encourage a cat to urinate in the same spot, and avoid strongly scented products. Dry the pan completely before adding fresh litter, or it will clump to the floor.
When should I replace a plastic storage bin litter pan?
When the floor is deeply scratched, cracked or cloudy, or still smells after washing. Scratches hold urine that cleaning cannot reach. Check monthly by running a fingernail across the floor of the pan; if it catches in grooves, it is time for a new bin.
