Under Sink Storage Hacks For Tiny Bathrooms That Save Space

In compact homes and urban apartments, every inch of space counts—especially in the bathroom. The area beneath the sink is often overlooked or poorly utilized, yet it holds immense potential for clever storage solutions. With thoughtful organization and a few strategic upgrades, this cramped zone can transform from a cluttered catch-all into a highly functional hub for daily essentials. Whether you're dealing with a powder room, a guest bath, or a master bathroom with limited square footage, these practical under sink storage hacks will help you reclaim lost space, reduce visual chaos, and streamline your routine.

Assess Your Under Sink Space First

Before diving into organizing solutions, take time to evaluate what you’re working with. Not all under sink cabinets are created equal. Some have plumbing that juts out awkwardly, while others may be shallow or oddly shaped due to pipe placement. Begin by removing everything from the cabinet and cleaning the interior. Then examine the following:

• The available height and depth
• Pipe configuration (P-trap location, supply lines)
• Door swing and clearance issues
• Weight capacity of shelves (if any)

Understanding these limitations ensures that any storage system you install fits properly and functions safely. For instance, stacking heavy containers on a flimsy shelf could lead to collapse, especially if pipes shift over time. Measuring the interior dimensions accurately also prevents wasted purchases—no one wants to return a wire rack because it’s half an inch too wide.

Tip: Use painter’s tape to mark pipe locations on the floor and walls inside the cabinet—this helps visualize usable zones when planning storage layouts.

Use Adjustable Shelving and Tiered Organizers

One of the most effective ways to increase storage capacity is by adding vertical layers. Most under sink cabinets come with a single fixed shelf, leaving large gaps above or below the sink trap. Installing adjustable shelving allows you to customize heights based on container sizes and avoid obstructing plumbing.

Wire or metal tiered organizers are particularly useful because they offer airflow, visibility, and flexibility. Unlike solid plastic bins, wire units let you see what's stored behind and allow moisture to escape—critical in humid bathroom environments. Look for models with sliding trays or pull-out baskets for easier access to back corners.

“Vertical layering doubles storage efficiency in small cabinets. Even a simple second shelf can free up 40% more usable space.” — Lena Pruitt, Interior Organizer & Small Space Consultant

If you prefer DIY solutions, consider installing tension rods horizontally across the cabinet to create levels for spray bottles or tall containers. Alternatively, stackable acrylic bins work well for separating categories like hair care, skincare, and cleaning supplies.

Choose the Right Containers and Bins

Open shelving exposes contents, so selecting the right storage containers does more than just organize—it enhances aesthetics and functionality. Clear, labeled bins make finding items faster and prevent forgotten products from expiring in the back.

For under sink use, prioritize materials that resist moisture and mildew. Acrylic, BPA-free plastic, and coated metal are ideal. Avoid cardboard or untreated wood, which degrade quickly in damp conditions.

Container Type	Best For	Avoid If...
Clear Stackable Bins	Grouping similar items (e.g., razors, cotton pads)	You need deep access; some block rear items
Rotating Turntables (Lazy Susans)	Bottles, tubes, and circular-shaped products	Cabinet is too narrow or pipes interfere
Hanging Door Baskets	Small tools: combs, nail clippers, toothbrushes	Doors don’t close fully when loaded
Pull-Out Drawer Units	Frequent-use items needing quick access	Not enough depth for drawer mechanism

When choosing bin sizes, ensure there’s at least 1–2 inches of clearance around pipes and moving parts. Overcrowding leads to frustration and makes cleaning difficult. Label each container clearly using waterproof labels or a label maker.

Maximize Hidden Spaces with Custom Hacks

Some of the best storage opportunities are invisible at first glance. These creative hacks tap into overlooked areas beneath the sink:

1. Side-mounted magnetic strips: Attach one to the inside of the cabinet door or side wall to hold metal tools like tweezers, scissors, or bobby pins.
2. Adhesive hooks on the underside of the shelf: Hang lightweight mesh bags for sponges, scrub brushes, or travel-sized toiletries.
3. Foam-padded pipe insulation sleeves: Wrap exposed pipes to protect containers from scratches and insulate against condensation.
4. Over-the-door shoe organizers (mini version): Use a slim, clear-pocket organizer designed for closets to store small bottles, dental floss, or sample products.
5. Under-shelf wire baskets: Clip-on baskets add extra layering without permanent installation.

These micro-solutions may seem minor individually, but together they can free up significant shelf real estate.

Tip: Repurpose old cutlery trays as dividers inside drawers or bins—perfect for keeping brushes, razors, and tubes upright and separated.

Step-by-Step: Transform Your Under Sink Cabinet in One Hour

Follow this timeline to go from cluttered to organized efficiently:

1. Minute 0–10: Empty the cabinet completely. Wipe down all surfaces with a disinfectant cleaner.
2. Minute 11–20: Sort items into categories: skincare, haircare, cleaning supplies, medical, miscellaneous.
3. Minute 21–30: Discard expired products, empty containers, and duplicates. Recycle packaging where possible.
4. Minute 31–40: Measure interior dimensions and test-fit chosen organizers (shelves, bins, turntables).
5. Minute 41–55: Install shelving, hang door baskets, place bins, and arrange items by frequency of use.
6. Minute 56–60: Label containers, check door clearance, and step back to assess flow and accessibility.

This methodical approach ensures you don’t skip crucial steps like decluttering or measuring, both of which are essential for long-term success.

Real-Life Example: A NYC Apartment Bathroom Makeover

Sophie, a graphic designer living in a Brooklyn studio apartment, struggled with her bathroom’s undersized vanity. The under sink cabinet was a jumbled mess of shampoo bottles, backup toilet paper rolls, and cleaning sprays. She avoided opening it because items would tumble out.

After reading about modular storage systems, she invested in a two-tier pull-out wire basket set designed for tight spaces. She paired it with a small lazy Susan for her partner’s grooming products and added adhesive hooks to hang a reusable makeup wipe bag. Using foam pipe covers, she protected the new baskets from rubbing against metal joints.

The result? Everything now has a designated spot. Daily items are accessible with one smooth pull, and seasonal supplies fit neatly behind. “I actually enjoy opening the cabinet now,” she says. “It feels like I’ve gained a whole new storage room.”

Checklist: Optimize Your Under Sink Storage

Use this checklist before and after your reorganization project:

• ☐ Remove all contents and clean the cabinet interior
• ☐ Identify and discard expired or unused products
• ☐ Measure height, width, and depth including pipe obstructions
• ☐ Choose storage solutions that accommodate plumbing layout
• ☐ Group items by category and usage frequency
• ☐ Install shelves, bins, or pull-out systems securely
• ☐ Label all containers for easy identification
• ☐ Test door closure and accessibility after loading
• ☐ Add protective padding to pipes if needed
• ☐ Schedule a monthly 5-minute tidy-up to maintain order

FAQs About Under Sink Bathroom Storage

Can I install a drawer under my bathroom sink?

Yes, if there’s sufficient depth and clearance around plumbing. Pre-made slide-out drawer kits are available for standard vanity sizes. However, custom cabinetry or professional installation may be required for non-standard setups. Always confirm weight limits and ensure the drawer doesn’t interfere with shut-off valves.

How do I prevent musty smells under the sink?

Mold and odors thrive in dark, damp environments. To prevent this, avoid storing wet sponges or towels under the sink. Use breathable containers like wire baskets instead of sealed plastic bins. Place a small charcoal or baking soda deodorizer inside the cabinet, and wipe down surfaces monthly. Ensure ventilation by occasionally leaving the door open after showers.

What should not be stored under the bathroom sink?

While convenient, the under sink area isn’t ideal for certain items. Avoid storing prescription medications (humidity affects potency), flammable cleaners (near hot water pipes), valuable electronics, or children’s toys unless secured in locked bins. Also, never overload the space—excessive weight strains hinges and shelves.

Final Thoughts: Small Changes, Big Impact

Organizing the space under your bathroom sink isn’t about perfection—it’s about practicality. In a tiny bathroom, efficient storage means fewer trips to closets, less countertop clutter, and a calmer morning routine. The key is to work with your existing layout, not against it. By combining smart shelving, purposeful containers, and a few inventive tweaks, even the most cramped cabinet can become a model of efficiency.

Start small: dedicate one evening to clearing and assessing. Then implement one or two changes at a time. Over weeks, you’ll refine the system to match your habits. Remember, the goal isn’t just to fit more in—it’s to make life easier, one well-placed bottle at a time.

💬 Have a brilliant under sink hack you swear by? Share your tip in the comments—your idea might help someone finally solve their bathroom storage puzzle!