Install a Vanity Light Above Your Bathroom Mirror

The vanity light is the workhorse of bathroom lighting, the fixture that determines whether your morning routine happens in flattering clarity or dim guesswork. Most bathrooms come with builder-grade fixtures that cast shadows exactly where you need light, positioned too high or too low, or running on bulbs that make everything look institutional. Swapping it out is one of the most satisfying upgrades you can make in an afternoon, requiring only basic electrical knowledge and the confidence to work with wires that won't shock you as long as you've actually turned off the right breaker. The mechanical task is straightforward—disconnect three wires, connect three wires, screw a plate to the wall. The real skill is in choosing a fixture that puts light where faces are, not where the ceiling is, and in making sure your new hardware lines up with the old electrical box without requiring drywall surgery. Most vanity lights mount to a standard rectangular box, and most bathrooms already have one centered above the mirror. If yours doesn't, or if you're moving the fixture, you're in different territory that involves cutting walls and running wire. This guide assumes you're replacing an existing fixture in the same location.

1. Kill power and verify it's dead. Go to your electrical panel and flip off the breaker that controls the bathroom light. Flip the vanity light switch to confirm nothing happens. If you're not certain which breaker it is, flip them systematically until the light goes dark. Use a non-contact voltage tester at the switch and at the fixture itself before touching any wires—breaker labels lie, and some bathrooms share circuits in unexpected ways.
2. Remove the old fixture. Most vanity lights have a decorative cover or glass shade that pulls off or unscrews, revealing mounting screws underneath. Remove those screws and gently pull the fixture away from the wall. You'll see wire connections inside the electrical box, usually capped with wire nuts. Unscrew the wire nuts and separate the wires—black from black, white from white, and bare copper ground from the green screw or ground wire.
3. Inspect the electrical box and mounting hardware. Look at the electrical box in the wall. It should be a rectangular metal or plastic box, securely fastened to a stud or blocking. Check that it's not loose or damaged. Most new vanity lights come with a mounting bracket or strap that screws into the threaded holes in the box. If your box has different hole spacing than the new bracket, you may need a universal crossbar, which comes with most fixtures.
4. Attach the mounting bracket. Screw the mounting bracket or crossbar to the electrical box using the machine screws provided with your fixture. Make sure it's tight and level. This bracket is what supports the entire weight of the fixture, so don't skip threads or leave it loose. The bracket should sit flush against the wall or electrical box, depending on the fixture design.
5. Connect the wiring. Match the wires from your new fixture to the wires in the box. Connect black to black (hot), white to white (neutral), and bare copper or green ground to the ground wire or green screw in the box. Twist the bare ends together clockwise, then screw on wire nuts, twisting clockwise until tight. Tug each connection to make sure it's secure. Fold the wires neatly back into the box.
6. Mount the fixture base. Align the fixture's base plate with the mounting bracket and secure it with the screws or knurled knobs provided. Most fixtures either screw directly to the bracket or slide onto a center post and lock with a decorative cap nut. Make sure the fixture sits flat against the wall with no gaps. If there's a gap, check that the electrical box isn't recessed or that wires aren't pushing the fixture out.
7. Install bulbs and shades. Thread in the bulbs specified by your fixture's rating, usually marked on a label inside the socket or in the instructions. Don't exceed the maximum wattage. Attach any glass shades, globes, or decorative covers according to the fixture design. Some twist on, some are held by set screws, some clip into place.
8. Restore power and test. Go back to the breaker panel and flip the bathroom breaker back on. Return to the bathroom and flip the light switch. The fixture should light immediately. Check that all bulbs work and that there's no buzzing, flickering, or burning smell. If the breaker trips when you turn it on, you have a short—turn off the breaker and recheck your wire connections.