A simple vanity swap can transform your bathroom's storage and style
Upgrading a bathroom vanity is a relatively quick way to increase storage and introduce high-end finishes like marble. However, the process involves more than just swapping a cabinet; it requires careful plumbing adjustments and precise carpentry to ensure a professional, watertight result.
The replacement process begins with essential plumbing preparation. Before any demolition, you must shut off the water supply to the faucet. This is a critical moment to inspect the age and functionality of your shutoff valves; if they are difficult to operate, it is an ideal time to replace them. Once the water is off, disconnect the supply hoses and remove the p-trap from beneath the sink. To detach the old unit from the wall, use a utility knife to slice through the caulk sealing the countertop and vanity to the wall.
Removing the old unit requires a two-step approach: first, lift the existing countertop out of the cabinet, then unscrew the vanity from the wall and remove any decorative trim holding it in place. After the old cabinet is gone, cleaning the area is vital. If you are installing new valves, you will need a tubing cutter to expose fresh copper, which you can clean using a plumber's mesh screen.
Precision is required when preparing the space for the new cabinet. You should measure the width of the new vanity and mark the baseboard accordingly, leaving a small amount of extra space—for instance, marking 42 ⅛ inches for a 42-inch cabinet—before trimming the board with an oscillating tool. When installing the new valve, remember to place the nut and brass ferrule on the pipe first, applying pipe dope to the ferrole before tightening.
The final installation focuses on stability and sealing. After placing the new vanity, use shims to ensure the cabinet is level both front-to-back and side-to-side before screwing it into the wall. To prevent leaks, apply a bead of silicone caulk to the top of the vanity before setting the pre-installed countertop into place. Finally, reconnect the p-trap and supply hoses, then test the faucet for leaks.
Source: How to Replace a Bathroom Vanity | This First House
