Buying a stock vanity is easy; getting one that fits your exact space, storage needs, and style rarely is. That is why solid bathroom vanity plans are worth the effort — a custom-built cabinet lets you control the height, the depth, the drawer layout, and the plumbing cutouts down to the inch. Whether you are a confident DIYer or working with a carpenter, understanding the standard dimensions and construction sequence keeps the project from turning into an expensive mistake. This guide covers the numbers, the materials, and the build order for a vanity that lasts.
Part of our Bathroom Remodeling & Flooring guide — explore the full guide →
Standard Vanity Dimensions to Plan Around
Before you cut anything, lock in your dimensions. These are the industry standards that keep a vanity comfortable to use and compatible with off-the-shelf tops and sinks:
- Height: 32 to 36 inches. The old standard was 32 inches, but “comfort height” at 34 to 36 inches is now common and easier on your back. Add roughly 1.25 inches for the countertop thickness.
- Depth: 21 inches for the cabinet box, 22 to 22.5 inches for the countertop overhang. Slim vanities for tight baths run 18 inches deep.
- Width: anything from 24 inches for a single small sink to 72 inches for a double. Plan width to leave at least 4 inches of clearance on each side where possible.
- Toe kick: 3 to 4 inches high and 3 inches deep, recessed under the front so you can stand close.
Measure your actual space carefully, accounting for baseboard, door swings, and the toilet clearance codes require — most jurisdictions want at least 15 inches from the vanity centerline to any side wall or fixture.
Choosing Materials
A bathroom is a wet, humid environment, so material choice determines whether your vanity survives five years or twenty-five.
Cabinet Box
Use 3/4-inch plywood for the box rather than MDF or particleboard. Plywood resists moisture and holds screws far better, especially around the sink where leaks eventually happen. Birch or maple plywood gives a paintable, stable surface. If you paint the interior with a moisture-resistant primer, you buy extra insurance against humidity.
Face Frame and Doors
Poplar is the go-to for painted face frames and doors — it is affordable, machines cleanly, and takes paint beautifully. For a stained wood look, use oak, maple, or walnut. Shaker-style doors are the easiest to build and never go out of style.
Countertop
Quartz and granite are the durable premium choices; cultured marble and solid surface are budget-friendly and come with integrated sinks that eliminate seams. If you want a wood or concrete top, seal it aggressively and expect more maintenance.
Planning the Plumbing
This is where DIY vanities go wrong. Before building, map exactly where your water supply lines and drain exit the wall or floor. Standard rough-in places the drain about 18 to 20 inches off the floor and centered on the sink, with hot and cold supply lines flanking it about 8 inches apart.
In your plans, mark a plumbing access zone on the back of the cabinet — you will cut a notch or a large opening in the back panel and the shelf to clear the P-trap and shutoff valves. For a drawer-front vanity, plan a U-shaped notch in the top drawer box so it clears the drain and still functions. Never build a fixed shelf directly where the trap sits; you will be tearing it out the first time you need to snake the drain.
Cabinet Layout Options
Your internal layout should match how you actually store things. Common configurations include:
- Two doors, one shelf: the simplest and cheapest, with open storage for baskets and cleaning supplies.
- Drawer stack: a bank of drawers on one side is the most functional for toiletries; U-notch the drawers around the plumbing.
- Combination: doors under the sink where the plumbing lives, drawers on the far side where there is clear space — the best of both.
- Open floating vanity: wall-mounted with no toe kick, modern and easy to clean under, but requires solid blocking in the wall to carry the load.
Step-by-Step Build Sequence
With plans and materials ready, the build follows a logical order:
- Cut the box panels — two sides, a bottom, a back, and cleats or a top brace. Assemble with wood glue and pocket screws or dados for strength.
- Build and attach the face frame — glue and clamp the poplar frame, then attach it flush to the front of the box.
- Add the toe kick by recessing the bottom or building a separate base platform.
- Cut plumbing openings in the back panel and any shelves before installation, while the cabinet is easy to maneuver.
- Build doors and drawers — Shaker doors from stile-and-rail construction, drawers from 1/2-inch plywood on soft-close undermount slides.
- Sand, prime, and paint everything before final hardware install. Two coats of a durable enamel like an alkyd or waterborne acrylic hold up to bathroom moisture.
- Set the cabinet, level it with shims, and secure it to wall studs.
- Install the countertop and sink, then connect the plumbing and check for leaks.
Pro Tips That Save Headaches
Level and shim the cabinet before you set the top — a countertop installed on an out-of-level base will crack or seat unevenly. Leave the back panel slightly oversized and scribe it to the wall if your walls are wavy, which older homes almost always are. Use soft-close hinges and slides; the small upcharge dramatically improves how the finished vanity feels. And always dry-fit the plumbing before final assembly so you catch a clearance problem while it is still fixable.
Sink and Faucet Planning
Your sink choice shapes the whole vanity plan, so decide early. An undermount sink mounts below the countertop for a clean, wipe-friendly edge and is the go-to for quartz and granite tops. A vessel sink sits on top of the counter and requires a lower cabinet height — usually 30 to 32 inches — so the finished bowl rim lands at a comfortable 40 inches. A drop-in sink is the easiest to install but leaves a visible rim. Whatever you choose, confirm the cabinet width leaves room for the bowl plus at least a couple inches of counter on each side.
Plan the faucet at the same time. A standard single-hole or widespread faucet needs corresponding holes drilled in the countertop, and a wall-mounted faucet needs the supply lines roughed into the wall at the right height before you tile or finish. Wall-mount faucets look striking over a vessel sink but must be planned before the wall is closed up, so lock that decision in during the framing stage, not after.
Storage Features Worth Building In
The difference between a builder-basic vanity and a genuinely useful one is the interior. A few upgrades pay off every day:
- A U-shaped drawer that wraps around the plumbing turns dead under-sink space into usable storage.
- An outlet or charging drawer with a power strip mounted inside keeps hair tools plugged in and hidden.
- A tip-out tray at the false drawer front by the sink stashes sponges and small items.
- Full-extension soft-close slides let you reach the very back of deep drawers.
- An adjustable shelf rather than a fixed one adapts to tall bottles and cleaning supplies.
Think through what you actually store in your bathroom and design the interior around it. Custom-building the vanity is the whole reason to do this yourself, so take advantage of it instead of copying a stock layout.
Bringing Your Vanity Plans to Life
A well-planned bathroom vanity comes down to three disciplines: nail the standard dimensions so it feels right to use, choose moisture-resistant materials so it survives the environment, and map the plumbing before you build so the cabinet actually fits over the pipes. Follow the build sequence in order, dry-fit the plumbing, and finish with a durable enamel, and you will end up with a vanity tailored to your bathroom that would cost two or three times as much from a cabinet shop. Take the time to draw a detailed plan first — every hour spent on paper saves two at the saw.
