Under Bathroom Sink Cabinet Storage: How To Add A Shelf Inside Your Vanity In Under 20 Minutes And For Less Than $20!

bath & sink organizers DIY

under bathroom sink cabinet storage

Bathroom Organizing DIY: How To Easily Double The Storage Capacity Under Your Sink For Cheap
Last week, I showed you how I transformed the look of this kid’s bathroom in just 8 hours. This week, I’m showing you how I upgraded the organization in this small bathroom by installing a super easy and cheap under-sink shelf to double the storage space!

This diy bathroom vanity shelf will give you twice the space under your current bathroom sink without a tun of work or money. And who couldn’t use a little extra bathroom storage, am I right?

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wood stripping / scrap 1×2
scrap plywood or 2x stair treads
2 1/2” wood screws
wood glue (optional)

Who here has too much bathroom storage space? HA! Right?! Naw. We all need better solutions for storing our toiletries and household essentials without replacing a bathroom vanity or installing a bathroom wall cabinet!

This is the sort of project that has always really intimidated me. I was so nervous that it was going to be a major challenge that I’d set aside two whole days to complete it. I was worried I wouldn’t be able to get better storage in my bathroom without installing a new bathroom vanity. Since replacing the vanity and sink wasn’t in the budget, I ignored the problem for far too long.

Isn’t it funny that the ones we procrastinate most end up being the easiest tasks we complete?!

I’m no novice when it comes to building – I’ve framed rooms, built furniture, installed tons of built-in shelving, etc – so why was I so scared of this tiny job? Well, friends, my experience has taught me that sometimes the small jobs end up being the hardest.

For this project, that experience does not apply. This ended up being the easiest DIY I’ve tackled in years.

Here’s how you can install an under bathroom sink shelf and make your bathroom vanity so much more efficient:

how to build a bathroom vanity shelf for storage

DIY Vanity Storage Shelf

Step One – Draw Up Your Plan

Don’t fret. This isn’t as complicated as it sounds. Your plans don’t have to be professional drafts. I sketched out these plans in under a minute. And don’t worry that it needs to be complicated. It doesn’t. There’s no need to add drawers, cubbies, etc. A simple shelf works just as well as a store-bought bathroom vanity organizer once you add bins.

I just want you to have an idea of what the end result should look like and how the technicalities may play out before you begin.

It’s okay if you veer from your plans. Originally, I had included two shelves and a divider system in my drawings. Once I gathered everything I needed to store within the vanity, I realized I actually didn’t need that complicated system after all! So I changed gears slightly. It’s cool. As long as the end result is still optimized storage capacity, I was fine with changing the plan as I went.

under cabinet bathroom storage

Step Two – Figure Out What Items You Need To Store

The best bath and sink organizers are the ones that are customized for your actual items. The best way to make sure you’re going to end up with a space you can actually utilize is to put every single item that needs to be stored under your sink into a pile.

For me, that meant combining the items I’d previously stored in the bathroom vanity with the ones I’d been storing in the hallway linen closet.

organizing a small bathroom

Our linen closet is actually across the hall from this bathroom. When I was making decisions about what to store in this room, I wanted to take into consideration the best way to optimize the storage for our entire home – not just this bathroom.

While the daily use of this bathroom is for our daughter, we also use it as a shared guest bathroom when we have overnight company. In the past, we’ve stored all of our guest toiletries in the guest bedroom and this linen closet. Since that would require them to grab what they needed before they got into the space, it seemed like an ineffective system. After all, what’s worse than getting completely naked, jumping in the shower, and then realizing you forgot your soap? Doing that in someone else’s home and then having to do a naked towel run across the hall, right?

So I decided to move all of the bathroom toiletries into this space and also carve out some room for extra toilet paper and the cleaning products we use exclusively for this bathroom (Lysol, wipes, trash bags, etc). Having everything already on-hand might convince me to clean more. Smart thinking, right?

bathroom vanity organizer

Once I’d gathered all the items I needed to store, I made some decisions about the placement of the shelf.

To do this, I grabbed the tallest item in the collection and used a level to mark the minimum height requirements of that item on the inside of the vanity. Because what’s the point of adding a system that doesn’t actually store the items you need to conceal, right?

I repeated this on both sides of the vanity interior.

how to install a bathroom sink storage shelf

Step Three – Determine Shelf Placement

Knowing the max height of the items I needed to accommodate, I could determine where I actually wanted my shelf to be installed.

I decided to install it roughly half-way up the side of the vanity, to allow for minimum cuts around plumbing.

I used my level to mark a straight line that will guide the placement of my shelf braces along the sides of the interior of the vanity.

diy vanity storage

Step Four – Remove the P-Trap

If you’re not familiar with plumbing, this may sound intimidating but I promise it’s super simple. The P-Trap is the curved section of the drain’s plumbing:

bathroom sink storage

Step Five – “Dry Fit” Shelf

Let’s talk about the shelving materials. You have so many options for what you can use here. You can use some scrap plywood, cut into two pieces that are each 1/2 the interior depth of the vanity. You can use two pieces of thin lumber. It really doesn’t matter what you use – you just want to make sure you have two pieces that you can fit together because one piece will not fit properly. (I used a leftover stair tread kit that I’d miscut during our ORC Foyer Project, by the way)

Before you attach any braces, you’ll want to measure the interior width of your vanity and cut your wood to size. Get it as close as possible to the actual interior width but don’t fret if it’s slightly smaller. You’re going to lay those pieces on top of braces, so they don’t have to be tight with the sides.

Once your shelf wood pieces have been cut to width, “dry fit” them in place in order to mark your placement of the plumbing cuts onto the wood.

over the sink shelf bathroom

Step Six – Cut Holes For Plumbing

The idea here is to make this hole as small as possible without creating pressure on your plumbing. I used a 5” hole saw because it’s what I had on-hand. You can absolutely use a jigsaw as well, since you’re cutting on the edges of the wood pieces and not the interior.

In fact, a jigsaw would probably have been easier.

To cut with the holesaw, since it was on the edge, I had to clamp these boards to a wider board to get the cut even.

Step Seven – Install Your Shelf Braces

These are just the scrap strips of wood or 1x2s cut down to the length of the interior sides of the vanity. Since I had so much scrap leftover from the stairs, I was able to reuse the pieces of treat I’d had to trim off.

1×2” boards work just as well.

Use a drill to first create a pilot hole in the wood and vanity but be careful not to drill out the side of the vanity, if it is exposed.

Use a level to insure your braces are even, then screw into the side of the vanity. You can add wood glue, if you’re concerned your shelf will need additional stabilization. I opted out of this step.

how to build a bathroom vanity storage solution for cheap

Step Seven – Install Your Shelves

First, add the back piece of the shelf by placing it directly on top of your braces. Make sure you use the one that has the plumbing cut facing out:

under sink storage DIY

Repeat with the front piece, insuring the plumbing cut faces IN this time.

under bathroom sink cabinet storage

Step Eight – Finish With Paint + Stock Your Shelves

If you want a more finished look, you can paint or stain the shelf to match or contrast. I opted to just leave it raw. It looks great.

Then I added all of the items I need to store and oh my gosh look at how much extra space I have!

under cabinet bathroom storage

Builder Bathroom Vanity Storage Upgrade

I have enough space that I could add another plastic bin with washcloths and towels under there too! I’m so impressed by how much more organized this previously cluttered bathroom vanity is now!

Bathroom Organizing DIY: How To Easily Double The Storage Capacity Under Your Sink For Cheap #organization #diyhacks #bathroomstorage #organizeit #springcleaning

Every single item that will be put to use in this bathroom is now actually in this bathroom.

I even had enough room to fit all of my guests’ travel toiletry samples that I’ve been hoarding from hotels!

Am I the only person who does this? Surely not. I also donate a fair portion of these to homeless shelters each year, too.

Bathroom Organizing DIY: How To Easily Double The Storage Capacity Under Your Sink For Cheap #organization #diyhacks #bathroomstorage #organizeit #springcleaning

This project was completed as part of the At Home DIY Blog Hop. I’ve joined a group of other DIY bloggers to showcase our best project tutorials each month. This month, we’re all showing you how to build something that will help you organize your home – just in time for Spring Cleaning!

Here’s the full list participants who are spotlighting their DIY projects to help you tame the chaos today:

1905 Farmhouse, Abbots at Home, Bitterroot DIY, By Brittany Goldwyn, Creative Ramblings, Cribbs Style, Delicious & DIY, DIY Beautify, DIY Danielle, Dukes and Duchesses, Girl, Just DIY, Happily Ever After, Etc, Health, Home & Heart, House by the Bay Design, House on Longwood Lane, Just Measuring Up, Kenya Rae, Little Bits of Home, Living Letter Home, My Kitchen My Craft, Pinspired to DIY, Red Cottage Chronicles, Refashionably Late, Renovating Mapleson Manor, Savvy Apron, Shine Your Light, Shrimp Salad Circus, Songbird Blog, Southern Revivals, T.Moore Home, The DIY Dreamer, The DIY Village, The Frugal Homemaker, The Handyman’s Daughter, Two Feet First, What Meegan Makes, Zucchini Sisters

I’m so grateful for this group of bloggers. Without the challenge, there’s no way I would have jumped into this project. It’s been a real boost for our overall home organization. I’ve been trying to figure out a plan for this hallway linen closet since we moved in.

Bathroom Organizing DIY: How To Easily Double The Storage Capacity Under Your Sink For Cheap #organization #diyhacks #bathroomstorage #organizeit #springcleaning

Bathroom Organizing DIY: How To Easily Double The Storage Capacity Under Your Sink For Cheap #organization #diyhacks #bathroomstorage #organizeit #springcleaning

And then look at what I managed to achieve! I went from this janky storage mess of a closet to this orderly cube in under an hour. Now I can’t wait to tackle this closet. It deserves to have linens (that we’re otherwise storing in our dressers).

I feel like this one project changes the whole game!!

Kid’s Bathroom Makeover Before + After

click below to see how I transformed this bathroom in just one day for under $200!

Love the look of my colorful kid’s bathroom?

great news: you can still find everything I used! (plus it was all super cheap)

colorful bathroom makeover




UPDATE: We’ve moved! In July 2019, we moved into a much smaller home in the city!
Click here to see Why We Downsized or tour Our New Historic Home.


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  1. I absolutely LOVE this idea!!! I hate wasted space anywhere in a home and under a sink is the worst. I don’t like to do this, but the only thing I see wrong with this project is that you will not be able to turn off your water line going to the sink. This issue could be a problem, but the shelf idea is fantastic!!!

  2. AWESOME job as usual Teri! Love your work 🙂 So glad to be on this blog hop with you this go around!

  3. LOVE this! We are under utilizing the space in every bathroom we have! You definitely got my wheels turning! Btw I LOVE the bathroom makeover too! So bright and cheerful 🙂

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