How to Hang a Bathroom Medicine Cabinet Above the Sink

Mounting a medicine cabinet above your bathroom sink is one of those straightforward installations that makes an immediate difference in how functional your space feels. You're not just hanging a box—you're anchoring a fixture that will hold weight, take daily use, and need to sit perfectly level in a space where you see it every morning. Done right, it disappears into the wall. Done poorly, it creeps down, pulls away, or sits crooked enough that you notice it forever. The stakes are small, but the execution matters. Most cabinets fail because installers skip stud-finding or don't account for the thickness of tile or drywall variations behind the sink. This guide handles both.

1. Find Your Studs First. Use an electronic stud finder to locate the wooden or metal studs behind your sink. Mark their positions lightly with pencil on both sides of where the cabinet will sit. If you're between studs and the cabinet requires stud mounting, you'll need to relocate it. Most medicine cabinets are 20–30 inches wide, so you should be able to catch at least one stud, usually two.
2. Mark Eye Level. Hold the cabinet at the wall where you want it mounted. The center of the mirror should be at eye level when you're standing normally at the sink—typically 60–66 inches from the floor for an average adult. Measure the cabinet's height, then mark the top and bottom edges of the mounting rail in pencil. Step back and check that it feels right; if you're sharing a bathroom, use a height that works for the shortest person in the household.
3. Avoid Hidden Hazards. Turn off the circuit to any electrical outlets in the sink area. Look at the cabinet's mounting rail location and confirm there are no water supply lines, drain lines, or electrical conduits running vertically in that zone. If you hit unexpected plumbing or wiring, adjust the cabinet location. A simple knock on the wall often reveals hollow vs. solid spaces; pipes and wires create dead spots.
4. Pilot First, Screw Second. Using a 3/32-inch drill bit, drill straight pilot holes through the mounting holes on the cabinet's rail at the exact locations where studs are present. If the wall has tile, use a tile bit and drill slowly to avoid cracking. Drill deep enough that your fastener will bite into solid wood—typically 1.5–2 inches into the stud. If you hit resistance early, you've likely hit tile; continue carefully through it.
5. Tighten Center First. If mounting into studs, use 2.5-inch wood screws (or the length specified by the cabinet manufacturer) and hand-tighten them first with a power drill set to low torque. Once all screws are hand-tight, switch to firm torque and tighten fully. The cabinet should sit flush against the wall with no gaps. Do not overtighten—you can crack the cabinet's housing or strip the studs.
6. Perfect Level Matters. Place a 2-foot level on top of the cabinet and across its width. If either direction shows a tilt, stop and adjust. Loosen the fasteners slightly, shim behind the mounting rail with thin shims if necessary, and retighten. The cabinet must be level both front-to-back and side-to-side, especially if the mirror is glass—a crooked installation will be obvious every time you look in it.
7. Load Heavy Items Low. Most medicine cabinets arrive with removable shelves and glass or metal shelf supports. Slide these into the grooved sides of the cabinet according to the manufacturer's layout. Check that the door swings freely without catching on shelves or the frame. Adjust shelf positions if necessary before final mounting.
8. Hang and Test Swing. If the door was removed for shipping, align the hinges on the door frame with the hinge sockets on the cabinet. Most modern cabinets use quick-release or screw-in hinge pins. Align the door carefully and secure it fully. Open and close it through a full swing to confirm it doesn't bind on the frame, shelves, or wall.
9. Seal Top and Sides Only. If there are gaps between the cabinet frame and the wall (common over tile or textured surfaces), apply paintable silicone caulk along the top and sides. Use a caulking gun and smooth it with a wet finger for a clean finish. This prevents dust and moisture from collecting behind the cabinet. Do not caulk the bottom—you want air circulation to prevent moisture trap.
10. Load and Verify Stability. Fill the cabinet with typical contents—bottles, jars, first-aid supplies—and distribute weight across shelves. Open and close the door repeatedly to confirm the hinges haven't loosened and the cabinet doesn't shift. Check that all fasteners are still tight. If anything feels loose or the cabinet seems to have shifted, halt and re-tighten.
11. Paint and Polish. If you drilled through tile or drywall, you may have created small chips or dust. Clean around the cabinet with a damp cloth. If you're painting the wall around the cabinet, do that now before the caulk fully cures. Allow caulk to cure for 24 hours before exposing it to moisture.
12. Add Anti-Tip Bracket. If your cabinet is tall (over 24 inches) or your household includes children or pets, consider adding an anti-tip bracket to the top of the cabinet frame, anchored to the wall studs above. This prevents the cabinet from tipping if someone pulls down on the door forcefully. Some high-end cabinets include these; others require aftermarket brackets.