How to Install a Medicine Cabinet or Wall-Mounted Shelf

Installing a medicine cabinet or wall shelf is one of the most practical bathroom upgrades you can do yourself. It costs less than $100 in materials, doesn't require a permit, and gives you immediate storage without eating into floor space. What matters most is getting the mounting right—a shelf that sits crooked or pulls away from the wall defeats the purpose and creates a safety hazard. We're going to show you how to find solid mounting points, get it level, and secure it so it actually supports weight.

1. Find Your Anchor Points. Use a stud finder to locate wall studs—they're 16 inches apart. Mark them lightly with a pencil. If you want to mount between studs (common for narrow shelves), you'll need heavy-duty anchors rated for your cabinet weight. Check the cabinet manual for weight capacity and buy anchors that exceed it by 50 percent.
2. Get Dead Level. Hold the cabinet or shelf at your desired height, or use standard bathroom measurements: medicine cabinets typically sit 48-52 inches from the floor to the center. Use a 4-foot level to draw a light pencil line across the wall where the top of the mounting bracket will go. Have someone hold it steady while you verify the level—this is where sloppy work shows.
3. Pilot Holes First. Position the mounting bracket (usually supplied with the cabinet) on your level line, with holes aligned over studs or your anchor points. Mark the hole locations with a pencil. Drill pilot holes slightly smaller than your fasteners—this prevents the wall material from cracking and makes fastener insertion easier.
4. Seat Anchors Gently. If you're using toggle bolts or heavy-duty expansion anchors, follow the manufacturer's instructions exactly—each type has a slightly different insertion method. For toggles, drill the hole to the specified diameter, insert the folded anchor, and tighten. For expansion anchors, insert and hand-tighten first, then use a drill to set them fully.
5. Secure the Bracket. Slide the bracket mounting fasteners into the drilled holes and tighten them hand-tight first. Use a level to verify the bracket is still perfectly horizontal. Tighten fully with a drill or screwdriver, working evenly across all fasteners so the bracket seats flat against the wall.
6. Test Before Loading. Lift the cabinet or shelf and hook it onto the mounting bracket according to the manufacturer's design. It may slide down a slot, hang from a lip, or secure with additional fasteners—follow those instructions. Once hung, place known weights inside (cans, bottles) and apply gentle downward pressure to confirm it doesn't shift, sag, or make any cracking sounds.
7. Seal Against Moisture. If the cabinet has a bottom plate or backplate that contacts the wall, any remaining fasteners (usually lag bolts or screws) should be tightened. Use paintable caulk to fill any small gaps between the cabinet edge and the wall—this prevents moisture from getting behind it and keeps the installation clean.
8. Organize for Function. Distribute weight evenly inside the cabinet. Heavy items belong on lower shelves. Leave air circulation around tall bottles so nothing blocks opening the cabinet door fully. If it's a shelf with glass front, clean the glass inside and out before you load it up.