How to Install a Bathroom Vanity

V anities are the anchor of any bathroom remodel. A well-installed vanity doesn't just hold the sink; it defines the workflow, storage, and aesthetic of the room. When done correctly, the piece feels like a permanent part of the wall, with perfectly sealed edges and reliable drainage that stands up to years of daily use. Getting this right requires patience with leveling and precision in plumbing. If your floor isn't perfectly flat or your wall studs aren't where you want them to be, a bit of extra effort during the install phase prevents wobbly cabinets and leaks down the road. Focus on creating a solid connection to the structure of the house, and the rest will follow.

1. Kill the Water First. Turn off the water supply valves under the sink and open the faucet to relieve pressure. Disconnect the supply lines and the P-trap drain assembly, catching any residual water in a bucket.
2. Strip the Old Cabinet. Unscrew the vanity from the wall studs. If it is caulked to the wall, use a utility knife to slice through the bead before pulling the unit away from the wall.
3. Get Level, Stay Level. Position your new vanity in the desired location and use a spirit level to check for plumb and level. If the floor is uneven, use plastic shims under the base to bring the cabinet to a perfectly level state.
4. Bolt to the Studs. Locate the studs in the wall behind the vanity and drill pilot holes through the back mounting rail of the cabinet. Drive wood screws with finish washers through the rail into the center of the studs.
5. Reconnect All Lines. Install the faucet and drain assembly to the sink top before mounting it to the cabinet if possible. Connect the water supply lines to the shut-off valves and reattach the P-trap to the sink drain.
6. Seal Every Seam. Apply a thin, consistent bead of high-quality silicone caulk where the vanity meets the wall and the floor. Wipe away excess with a damp cloth for a clean finish.