How to Organize Under the Bathroom Sink

Under the bathroom sink is either wasted real estate or your most functional storage zone—there's no middle ground. Most people cram it full and call it done, which means you're fishing around for dental floss at 6 a.m., bruising your knuckles on the drain, and never quite remembering what you bought three months ago. Done well, this cabinet becomes a quiet triumph: everything visible, within reach, and organized by use. The trick isn't fancy containers. It's understanding that bathrooms have specific gravity—what you need every morning lives where you can grab it without thinking, and the annual stock-up of toilet paper doesn't get in the way.

1. Strip It Down to Bare Cabinet. Remove everything—bottles, boxes, cleaning supplies, hair tools, medications, all of it. Take this moment to toss dried-up products, expired medications, and those half-empty bottles you'll never finish. Wipe down the cabinet bottom and sides with a damp cloth to remove dust and any product residue. Don't skip this. A clean surface is the foundation for anything that comes next.
2. Map Your Plumbing and Space. Look at where the drain, P-trap, and water supply lines sit. Measure the cabinet's width, depth, and height. Note any dead space above the pipes—this is often wasted real estate you can use. Measure the distance from the floor to the bottom of the sink basin and to any shelves. This information determines what organizers will actually fit and where.
3. Pick Your Storage System. Decide between tiered shelving (pull-out shelves, bamboo risers, or stackable organizers), drawer dividers for drawer cabinets, or a combination. Pull-out shelves work best under sinks because they give you access to the entire depth without reaching to the back. For small cabinets, tiered risers create vertical storage. For large cabinets, consider a pull-out trash or cleaning caddy for supplies. Don't buy yet—measure first and visualize how items will actually sit.
4. Seal the Cabinet Floor. If you have items you want to keep dry or protected from plumbing moisture and dust, place a waterproof mat or shelf liner on the cabinet bottom. This also makes cleaning easier later. Cut it to fit your cabinet floor, leaving gaps around pipes and corners. This step isn't mandatory but pays dividends if you store paper products, cleaning supplies in paper packaging, or anything moisture-sensitive.
5. Build Your Vertical Storage. If you're using pull-out shelves, follow the manufacturer's installation instructions exactly—they usually screw or click into the cabinet sides. Install the lowest shelf first, ensuring it's level and doesn't block pipe access. If using bamboo or plastic risers, simply place them on the floor or on an existing shelf. For water supply lines and drain pipes, ensure nothing sits directly against them—leave at least an inch of clearance for any condensation or slow leaks to drip down and out without pooling.
6. Assign Your Storage Zones. Organize items into logical categories: daily-use items (toothbrush holder, face wash, deodorant), cleaning supplies (under-sink cleaner, sponges), medications and supplements, hair and body products, and bulk stock (toilet paper, paper towels, spare bottles). Assign each category a specific zone within the cabinet. Daily items go at eye level or on the top shelf for quick access. Cleaning supplies can go lower since you use them less often. Keep medications in a small bin in a consistent spot where everyone knows to look.
7. Containerize Everything. Transfer bulk items and grouped products into clear plastic bins or caddies so you can see what you have without opening every box. Use small drawer dividers or bins within the larger container to keep related items together—one bin for hair products, one for first-aid supplies, one for spare bottles and refills. Label everything if you live with other people or if your memory for 'where I put the bandages' isn't reliable. Clear containers save time because you'll actually know when you're running low.
8. Reclaim Dead Space. The space directly above your P-trap and water supply lines is often wasted because you assume you can't use it. You can—with a simple shelf or caddy. Install a narrow shelf unit that clears your pipes by at least two inches, or use an over-the-cabinet door organizer on the inside of the cabinet door if it opens into the sink area. This gives you extra real estate for frequently grabbed items or overflow from your main zones. Make sure nothing hangs down far enough to interfere with opening or closing the cabinet.
9. Maximize the Door Space. The inside of the cabinet door is prime real estate often overlooked. If your door opens into the sink basin (most do), you have a few inches of space. Install a small adhesive organizer, magnetic strips for scissors or tweezers, or even a thin pull-out caddy designed for cabinet doors. Keep it light—mirrors, small cosmetic bottles, and frequently used tools work. Don't store heavy items here since they'll strain the hinge and make the door harder to close gently (which matters in a bathroom).
10. Repopulate With Purpose. Start by returning your daily-use items to the most accessible spots. Then place your organized bins in their assigned zones. Leave the lowest shelf or dead space for bulk stock and items you use infrequently. As you place items, step back and verify you can still open and close the cabinet smoothly, that nothing is leaning against pipes, and that everything feels balanced. If you reach for something and your hand hits a bottle, reorganize. The system should feel invisible when you're using it.
11. Keep It Fresh Quarterly. Once every three months, do a quick reset. Move things around if your habits have shifted, toss expired products, and wipe down the cabinet floor. This prevents the system from slowly devolving back into chaos. It takes about fifteen minutes and keeps everything functioning. If you notice something you never use, move it or donate it. The cabinet is for things you actually need.