How to Install a Bathroom Vanity

Before you start

This guide is intended for a straightforward vanity replacement using existing plumbing locations. Shut off the water at the fixture stops and confirm the supply is off before disconnecting anything. If valves will not shut off, plumbing must be relocated, hidden water damage is discovered, or electrical work is required, consider using a qualified professional.

Follow the vanity, countertop, sink, faucet, drain and sealant manufacturers' instructions because mounting and sealing requirements vary by product.

Project checklist

1. Remove the old vanity. Shut off the water, disconnect the supply lines and drain, cut old sealant where necessary, remove mounting fasteners and carefully remove the cabinet/top.
2. Inspect the space. Check the wall, floor, shutoff valves, drain location and supply connections. Repair water damage or other problems before covering the area with the new cabinet.
3. Position, level and secure the cabinet. Dry-fit the vanity around the existing plumbing. Shim as needed so it sits level and plumb, then fasten it using the manufacturer's instructions and appropriate structural attachment points.
4. Install the top, sink and faucet. Installing the faucet and some drain components before final countertop placement can make access easier. Use the sealants or gaskets specified by each manufacturer.
5. Reconnect plumbing. Connect compatible supply lines and assemble the drain without forcing misaligned fittings. Plumbing components should fit correctly rather than being pulled into position.
6. Seal and test. Apply bathroom-rated sealant only where required. Restore the water slowly and inspect the faucet, supply connections, drain and trap while both running and holding water in the sink.

Useful tools & materials

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Related plumbing projects

Also see How to Replace a Faucet and How to Replace a Shower Head for more bathroom and plumbing projects.