How to Replace a Small Bathroom Vanity

Vanity replacement is the most effective way to modernize a cramped bathroom without moving walls or relocating plumbing. When working in a small space, the goal isn't just aesthetics; it is about reclaiming square footage and ensuring the new cabinet clears existing pipe runs. Done well, a vanity swap looks intentional rather than forced. You want a seamless transition where the new unit sits flush against the wall, the supply lines remain accessible but hidden, and the sink seals perfectly against the backsplash. This project demands precision in measurement and a steady hand with a wrench.

1. Kill Pressure First. Locate the shut-off valves under the sink and turn them clockwise until tight. Open the faucet to bleed out any remaining pressure and drain the lines.
2. Disconnect All Lines. Use tongue-and-groove pliers to loosen the nuts connecting the supply lines to the faucet, then unscrew the p-trap from the tailpiece. Carefully pull the pipes away from the vanity.
3. Lift Out Old Cabinet. Use a utility knife to cut the caulk seal around the perimeter of the countertop and backsplash. Remove the screws securing the vanity to the wall and lift the unit out carefully.
4. Repair Hidden Damage. Clean the area where the old unit sat, removing any remaining adhesive or caulk. Check the wall for any water damage or rot that may have been hidden by the old cabinet.
5. Level and Lock Down. Slide the new vanity into place and use a level to ensure it is perfectly flat. If the floor is uneven, use plastic shims under the cabinet base until it sits level.
6. Restore Water Flow. Install the new faucet and drain assembly to the sink top according to the manufacturer instructions. Reattach the supply lines to the shut-off valves and reconnect the p-trap to the drainpipe.
7. Seal the Perimeter. Apply a thin bead of silicone caulk along the backsplash and where the vanity meets the wall. Wipe away excess caulk immediately with a damp cloth for a clean line.