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Qualceram Shires Avondale Beech Vanity Unit
First of all, as with any job involving plumbing, make sure the water supply is switched off before you start. Either turn off the hot and cold water valves inside the old vanity unit, or shut off the main supply for the whole house, depending on the design of your particular unit.
You'll need to use an adjustable wrench to disconnect the supply tubes for both the hot and cold-water valves. Next use adjustable pliers to remove the sink trap — remembering to put a container underneath to catch any drips. You may want to wrap some cloth or tape around the jaws of the pliers to prevent scratching chrome fittings.
Now you're ready to remove the screws or bolts holding your vanity to the wall, using a screwdriver or socket wrench. You should be able to find the screws either in braces in the back corners or in a rail along the back.
Detach the vanity top or sink to reduce the weight of the unit, rendering it easier to move. Most bathroom countertops are attached with adhesive caulk and can be removed using a 14-inch pry bar. You can use the same tool to separate the backsplash from the wall. Be sure to take care when doing this to prevent damaging the wall — or the vanity if you plan to reuse it.
Insert a wood shim behind the bar to help protect the wall. If the sink is in a cutout, lift it out once you've removed the tabs that hold it in place. Before moving your vanity, take out any removable drawers and detach the doors, once again to decrease the weight. Check whether the floor butts against the bottom of the vanity. If so, you'll need to use the pry bar to lift up the front and slip some wood shims underneath, so you can slide the vanity out without damaging the floor.