Where to Place Can Lights in Bathroom? | Spacing Rules For Every Zone

Place bathroom can lights by zone: 18–24 inches from the back wall over the vanity edge, centered and wet-rated in the shower, and spaced at half the ceiling height for general room lighting.

One wrong placement turns a bathroom from bright to harsh very fast. The fix is a set of spacing rules that work for any room size. Vanity lights need to sit over the front edge of the counter, not the wall, so the light hits your face instead of the mirror. Shower lights need wet-rated housings or they become a code violation. And the distance between each can is simply half your ceiling height. Below is the exact layout for each zone, plus the measurements that keep shadows away.

The Half-Ceiling Rule: The Base Spacing For Every Room

General can lights in a bathroom follow one spacing formula: divide your ceiling height in half. That number is the distance, in feet, between each fixture.

Start the first row half a spacing distance from the wall. On an 8-foot ceiling, that means the first can is 2 feet from the wall, the next is 4 feet from that one, and so on. This prevents dark corners and the scallop effect that a wall-hugging fixture creates.

Vanity Placement: Where The Light Hits The Face

The most common mistake is centering a can light directly over the middle of the vanity cabinet. That puts the light in front of your face and casts shadows onto the mirror. Instead, place each can 18–24 inches from the back wall directly over the front edge of the counter. For a standard 60-inch vanity that takes two lights, set the fixtures 20 inches in from either side. That spacing gives even coverage left to right with no dark zones on the face.

If the vanity is wider than 60 inches, add a third light and space them 12–18 inches apart. Keep every can at least 14–18 inches from upper cabinets so the light spreads down, not into the cabinet face.

Shower Placement: Wet-Rated Only And Centered

Every fixture inside a shower must carry a wet-location rating. Damp-rated lights are not safe here. A small shower, roughly 3×3 feet, can get one light centered in the middle. Larger or luxury showers need two or more fixtures spaced evenly so the light covers head to toe. When direct centering is impossible due to a joist or vent, mount an eyeball-style light 1–2 feet outside the shower opening and aim it inward.

Before you cut the first hole, check the best-rated models in this guide to bathroom can lights tested for wet zones.

Toilet Placement: One Downlight At The Seat Edge

The toilet zone needs one can light placed above the front edge of the seat. This puts light on the area a person occupies instead of over the tank, which wastes light on the wall. A single 4- or 6-inch fixture centered over the front edge of the toilet bowl is enough. No extra spacing math here — one light solves the shadow problem that a distant ceiling fixture creates.

Calculating The Number Of Lights For Your Room

Two methods work here. The direct math: divide the room’s square footage by the coverage of one fixture. A 4-inch can covers 25 square feet, and a 6-inch can covers 36. So a 50-square-foot bathroom with 6-inch cans needs two fixtures. The simpler rule is one light per every 4 to 6 square feet, leaning toward the lower end for small bathrooms and the higher end for large ones.

Use the larger spacing minimum even if the half-ceiling rule gives you a smaller number. Six-inch cans closer than 6 feet apart create a washed-out hot spot on the ceiling.

Installation Sequence: From Layout To Trim

1. Measure the room and draw a scale grid on paper. Mark the vanity center, shower, and toilet zones.
2. Apply the half-ceiling rule to mark even spacing. Start the first row half a spacing distance from the wall.
3. Cut ceiling holes per the housing manufacturer’s template. Over-cutting is permanent; under-cutting can be filed.
4. Run electrical cable from the switch to the first fixture, then daisy-chain to the next. Follow local code for box fill and wire gauge.
5. Push the housing into the hole and lock the clips. Wire the fixture black-to-black, white-to-white, and ground to the box.
6. Snap the trim ring in place and install the bulb or LED module.
7. Restore power and test. The even light spread across each zone with no hot spots or dark bands.

Fine-tune the output by swapping in a dimmable driver or LED bulb if the room feels too white against warm wall paint. One adjustment fixes that.

Common Layout Mistakes And How To Skip Them

Centering a single can over the vanity center is the biggest recurring error. That puts the fixture in front of you, not above where you lean in. The fix: place each can where the counter edge is, not the wall. Another frequent miss is running a single overhead light in a shower big enough for two people. The head-to-toe shadow that creates is uncomfortable and unsafe. Use two fixtures spaced across the shower width. And never assume a damp-rated fixture is fine in a steamy shower stall — code requires wet-rated, and inspectors check it.

PacLights’ bathroom lighting guide confirms the wet-rating requirement and includes the spacing rules for 4- and 6-inch housings.

Checklist: The One-Page Layout For Any Bathroom

• General spacing: half the ceiling height between fixtures, half that distance from walls.
• Vanity cans: 18–24 inches from the back wall, over the counter front edge, 12–18 inches apart.
• Shower cans: wet-rated only, centered in small showers, two or more in large ones.
• Toilet can: one fixture above the front edge of the seat.
• Wall clearance: keep cans at least 2–3 feet from side walls to avoid scallops.
• Cabinet clearance: 14–18 inches between a can and upper cabinets.
• Fixture spacing minimum: 4 feet for 4-inch cans, 6 feet for 6-inch cans.

Follow that list in sequence and the layout works for an 8-foot ceiling or a 10-foot one. The half-ceiling rule plus the zone adjustments cover every situation.