How to Remove & Replace a Vanity Top

Cut off the flow of water to the vanity’s sink by turning both valve handles under the sink clockwise by hand until they stop. Place a bucket under the sink to catch any water coming from the pipes or water lines.

Clamp a basin wrench to the water supply lines’ connections on the faucet’s underside and then loosen the connections by turning them counterclockwise. Loosen the water lines’ connections with the water supply valves using an adjustable wrench.

Turn the slip nuts on the drainpipe sections’ connections counterclockwise to loosen them, and then remove the pipe sections. Cut through the caulk seal between the vanity top and the bathroom wall with a utility knife, and then lift of the old vanity top up and off the cabinet.

Place the new vanity top on the cabinet. Spread an even coating of caulk where the vanity top or attached back splash contacts the bathroom wall.

Press an even layer of plumber’s putty onto the underside of the sink’s drain piece, and then press the drain piece into the opening in the bottom of the sink. Thread the retaining nut onto the underside of the drain piece and tighten it with slip-joint pliers.

Thread a pipe elbow onto the stubout pipe coming out of the wall, pointing the pipe elbow’s opening down. Attach a pipe trap to the elbow, and thread the other end of the trap onto the bottom of the sink’s drain piece.

Spread plumber’s putty on the new faucet’s deck, and then slide the deck onto the underside of the faucet assembly. Insert the faucet assembly into the holes in the vanity top and tighten the retaining nuts on the underside of the faucet using the basin wrench. Thread the water supply lines onto the connections on the underside of the sink’s faucet and the water valve bodies, and then tighten the connections with the basin wrench.