Building a bathroom vanity with drawers starts with a rigid cabinet frame, then sized drawer boxes and slides, finished with a secure wall-stud mounting.
Most DIY vanity failures trace back to one thing: a frame that was never truly square. Before you cut a single piece, know that the entire project hinges on building a rigid carcass. Whether you’re replacing an old fixture or adding storage, the payoff for solid framing is drawers that glide for years instead of binding in a season.
The Core Build Sequence
Every vanity build follows the same skeleton. Cut the cabinet side, front, back, and base pieces to size, then assemble them with pocket-hole joinery. Kreg’s single-sink vanity plan walks through joinery for the sides and base. Add the drawer dividers or center supports before you close up the front, so each opening is fully defined and square.
Measure every opening twice before building drawers. Slide compatibility is the most repeated warning in every plan, and with good reason; a drawer that’s 1/8″ too wide will bind against its neighbors. Keep about an 1/8″ gap around each drawer front to avoid friction.
Dimensions That Matter
Standard bathroom vanities come in widths of 18″, 24″, 30″, 36″, 42″, 48″, 60″, and 72″, with a 21″ depth commonly listed as the standard and 34″–36″ height described as “comfort height.” The 48″ model in our roundup of bathroom vanities with drawers shows a cabinet size of 47.2″ W × 18.5″ D × 33.3″ H with inside drawers of 11.8″ W × 15.7″ D × 7.9″ H.
Drawer configurations vary by width. Kreg’s modern vanity plan places the toe kick 2½″ back from the front and the base piece ¾″ back.
Drawer Boxes and Slide Installation
Cut each drawer box from front, back, side, and bottom pieces sized to its opening. Kreg’s plan uses 1/4″ grooves for the drawer bottoms and 1″ pocket-hole screws for box assembly. Install the slides before attaching the drawer fronts, aligning each box flush with or slightly inset from the cabinet face.
One proven vanity plan used 16″ slides installed 1½″ back from the front of the face frame. A top drawer opening of 5½″ and lower openings around 8″ work well for a single-sink layout. Fasten the drawer faces from inside the box once slides are mounted, so you can adjust the reveal before final tightening.
Humidity, Anchoring, and Finishing
Bathroom humidity will quietly destroy unfinished wood. Either use exterior-grade plywood throughout or seal everything exposed.
Floor support alone is not enough. Secure the vanity to wall studs through the rear frame with 2½″–3″ screws, then connect the sink, faucet, and supply and drain lines. Coordinate sink and plumbing cutouts with the cabinet layout before final assembly, not after.
References & Sources
- Kreg Tool. “DIY Single Sink Vanity with Drawers.” Provides the core cabinet frame and drawer box assembly steps.
- Kreg Tool. “Modern Bathroom Vanity with Drawers on the Bottom.” Details toe kick placement and drawer opening measurements.
- HGTV. “How to Build a Master Bathroom Vanity.” Covers plywood selection, wall ledger, and acrylic finish recommendations.
