How to Install a Bathroom Vanity

Installing a bathroom vanity involves disconnecting plumbing, removing the old vanity, positioning and securing the new one, then reconnecting water lines and testing for leaks.

1. Shut Off Water First. Shut off the water supply valves under the sink by turning them clockwise. If there are no shut-off valves, turn off water at the main. Disconnect the water supply lines from the faucet using an adjustable wrench. Place a bucket underneath to catch any remaining water. Remove the P-trap by loosening the slip nuts with channel lock pliers.
2. Strip the Old Vanity. If the countertop is separate from the cabinet, remove any screws or adhesive holding it in place and lift it off. For integrated tops, you'll remove everything together. Unscrew the vanity cabinet from the wall by locating and removing the screws that go into the wall studs. You may need to cut through caulk around the edges with a utility knife.
3. Find Your Studs. Clean the wall surface and floor where the new vanity will sit. Check that the floor is level using a spirit level. If it's not level, use shims to compensate. Locate and mark the wall studs using a stud finder, as you'll need to screw into these for proper support.
4. Level and Position. Place the new vanity cabinet against the wall in its final position. Use a level to ensure it's perfectly straight both horizontally and vertically. Adjust with shims under the cabinet if needed. The cabinet should sit flush against the wall with no gaps.
5. Lock It Down Solid. Drive 3-inch wood screws through the back rail of the vanity into the wall studs. Use at least two screws per stud that the vanity spans. Make sure the screws are long enough to penetrate the stud by at least 1.5 inches for solid attachment.
6. Set the Top. If you have a separate countertop, carefully position it on the cabinet. Most tops will have pre-cut holes for the sink and faucet. Secure the top to the cabinet using the clips or brackets provided, typically from underneath the cabinet. Apply a thin bead of clear silicone caulk where the countertop meets the wall.
7. Reconnect the Water. Install the faucet and sink if they're not already attached to the countertop. Connect the water supply lines to the faucet, using new supply lines if the old ones don't reach or are corroded. Hand-tighten first, then use a wrench to tighten an additional quarter turn. Reinstall the P-trap, ensuring all connections are snug but not overtightened.
8. Check for Leaks. Turn the water supply back on slowly and check all connections for leaks. Run both hot and cold water to ensure proper flow and temperature. Apply caulk around the base of the vanity where it meets the floor and wall. Clean off any excess caulk with a damp cloth before it dries.