Loosen the p trap.
Removing bathroom sink from wall.
Turn the water cut off valves under the sink.
Disconnect plumbing begin by turning off the hot and cold water shut off valves that are located beneath the sink.
If you want to remove the wall behind a bathroom sink but you plan to leave an existing commode or tub shower in place you must make provisions to vent those fixtures.
Do the same for sidesplash.
Removing backsplash use a razor knife to cut through caulking between the top of the backsplash and the wall.
And water cut off valves are on the hot and cold water lines coming out of the wall.
How to remove a wall mounted bathroom sinks.
How to remove a wall mounted sink step 1.
Place a small bucket on the floor beneath the water valves to catch any water left in the lines then disconnect.
Then place a bucket under the sink to catch any water remaining in the pipes as you disconnect them.