Installing Drawers and Hardware on a Bathroom Vanity

Installing drawers and hardware on a bathroom vanity is the difference between a cabinet that looks finished and one that feels cheap. The hardware—knobs, pulls, hinges—catches every eye, and the drawers need to operate smoothly without binding or tilting. This is work that demands precision, not strength. A vanity installed well will function quietly for years; one rushed will rattle, stick, and wear out hardware prematurely. The good news is that modern drawer slides and cup-style hinges have made this task far more forgiving than it was ten years ago. You're aligning, drilling, and fastening—all things you can control.

1. Square the Box First. Set the vanity on sawhorses at a comfortable working height, facing up. Check the interior for any manufacturing debris, finish drips, or rough edges that might bind drawer slides. Wipe clean with a tack cloth. Verify that the cabinet is square by measuring corner to corner diagonally—both measurements should be equal. If the cabinet is racked (twisted), you have a structural problem that must be resolved before installing slides; drawer operation will fail. Use shims and clamps to square the box if necessary.
2. Mark Both Sides Level. Drawer slides come in pairs and mount to the left and right interior walls of the cabinet. Mark the height of each slide according to the manufacturer's template, typically 1.75 inches up from the bottom for the bottom drawer. Use a level to draw a light pencil line across both sides at this height. For multiple drawers, space them vertically so that each drawer box clears the one below it; most three-drawer vanities space them 10 to 12 inches on center. Mark both sides of the cabinet at the same height.
3. Mount Both Slides Flush. Position the fixed (cabinet-mounted) slide on the pencil line you marked, aligned parallel to the cabinet side. The slide should be flush with the front edge of the cabinet (not recessed). Drill pilot holes at the mounting points and drive the fasteners provided. Ensure the slide sits flat against the cabinet side with no gaps. Install both sides before moving to the next drawer position. Use a level to confirm the slide is truly horizontal; a tilted slide will cause binding.
4. Test-Fit Before Fastening. Test-fit the drawer box into the cabinet opening to confirm clearance. The drawer should pass freely into the vanity without binding. Measure and mark the drawer mounting points on the drawer box sides, typically 1.75 inches up from the bottom of the drawer, matching the fixed slide height. These marks should be equidistant from front and back so the drawer tracks straight.
5. Attach Both Moving Slides. Position the moving (drawer-mounted) slide on the marked line, at the same distance from the front edge as the fixed slide is from the front of the cabinet. Drill pilot holes and secure the moving slide to the drawer box. Repeat on the other side. The moving slides should be perfectly parallel to each other, or the drawer will rack when extended.
6. Listen for Smooth Glide. Insert the drawer into the cabinet by aligning the moving slides with the fixed slides. The drawer should glide smoothly in and out with minimal resistance. Open and close it several times. Listen for grinding or resistance. If the drawer binds, remove it and inspect for obstacles, misaligned slides, or cabinet racking. Do not force a binding drawer; disassemble and correct the problem. Confirm that the drawer front is flush with the vanity face frame and sits level. Make adjustments by loosening slide fasteners and repositioning slightly.
7. Align All Drawer Fronts. If the vanity uses a separate face frame (stiles and rails that sit proud of the cabinet box), install it now according to the manufacturer's instructions. Attach the drawer fronts to the drawer boxes using the provided fasteners, which typically thread into the back of the drawer box through the front. Align the drawer fronts so they are flush with the face frame and parallel to each other. Leave an even reveal (gap) between drawers—typically 1/8 inch. Test operation once more before final tightening.
8. Measure Twice, Mark Once. Locate the hardware mounting points on each drawer front and door. For cup hinges on hinged cabinet doors, use the cup-hinge template supplied by the hinge manufacturer to mark the hole center. For drawer knobs and pulls, measure from the edge of the drawer front to the desired knob position—typically centered horizontally and 2 to 3 inches down from the top for a vanity drawer. Mark these positions lightly with pencil. Double-check alignment before drilling; misaligned hardware holes cannot be easily repaired.
9. Drill from the Back. For cup hinges, drill a 1.25-inch-diameter hole at the marked center using a Forstner bit or spade bit at the proper depth (typically 0.5 inches). For knobs and pulls, drill a clearance hole appropriate to the fastener size—usually 0.25 inches for standard bathroom vanity hardware. Use a depth stop or wrapped tape on the bit to prevent drilling through the front of the drawer. Drill from the back side if possible to prevent splintering the visible surface.
10. Use Threadlocker Always. For cup hinges, insert the hinge cup into the drilled hole and secure with the provided fasteners. Install the hinge arm on the face frame or cabinet side according to the manufacturer's instructions, ensuring the hinge allows the door to open smoothly and close flush. For knobs and pulls, insert the fastener from the front and secure from the back with a washer and nut, or thread directly into a threaded insert if the hardware uses one. Tighten hardware firmly but do not over-tighten, which can crack the vanity or strip threads.
11. Adjust Until Flush. Close each drawer and door and verify it seats fully and closes silently. Check that hardware does not interfere with adjacent drawers or doors. If a door does not close flush, adjust the hinge by loosening fasteners and repositioning the door slightly—most cup hinges offer lateral, vertical, and depth adjustment. Test drawer operation once more; hardware should not catch or interfere with guides. Make a final pass with a wrench to ensure all fasteners are tight.
12. Step Back and Inspect. Position the vanity in place in the bathroom and secure it to the wall and floor according to local code and manufacturer specifications. Step back and inspect all hardware from eye level. Verify that knobs and pulls are clean, that no fasteners are visible or protruding, and that all drawers and doors align symmetrically. Wipe the entire vanity with a soft cloth to remove dust and fingerprints. Test all drawers and doors one final time. The vanity should now function smoothly and look finished.