Installing Under-Cabinet Task Lighting

Under-cabinet task lighting transforms a kitchen from functionally lit to actually workable. The difference between overhead light bouncing around the room and focused light hitting your countertop is the difference between chopping vegetables by guesswork and seeing what you're doing. This is one of those projects that feels like an upgrade but installs like basic carpentry—no special skills required, just planning and patience. The payoff is immediate: better visibility, a brighter-feeling kitchen, and the kind of professional-looking detail that makes people ask who did your remodel.

1. Map Your Light Layout. Measure the length of your countertop from end to end. Determine how many light fixtures you need—typically one 24-inch fixture per 3 feet of counter, or two longer strips across the full length. Mark the mounting height on the underside of the cabinet: typically 2–3 inches down from the cabinet bottom, far enough back to shine light on the counter without the beam hitting the backsplash. Trace the intended power route on paper: straight back to an outlet, along a side wall, or up through the cabinet frame. This planning prevents mistakes that require rewiring.
2. Kill Power, Clear Space. If you're tapping into an existing outlet, flip the breaker off and test the outlet with a voltage tester to confirm it's dead. Clear the countertop below your work area and remove any items from inside the cabinets that might obstruct your installation. Wipe down the underside of the cabinets with a dry cloth—adhesive-mount fixtures need a clean, dust-free surface. If you're using screw mounts, mark the hole locations with a pencil and a small center punch to keep the drill bit from wandering.
3. Measure and Prep Wire. If your light fixtures don't come with enough wire to reach the power source, measure the distance from the light location to the outlet or junction box. Add 12 inches to your measurement for slack at both ends. Use 14-gauge wire for LED or low-draw fixtures; use 12-gauge for higher-wattage incandescent lights (though most modern under-cabinet lights are LED and draw minimal power). Cut the wire to length. If you're using adhesive-backed fixtures, you can run the wire along the top of the backsplash and tape it down; if using screw mounts, drill small holes in the cabinet frame or run the wire inside the cabinets to hide it.
4. Secure First Fixture. If using adhesive strips, peel the backing and press the fixture firmly to the underside of the cabinet, aligned with your pencil marks and level line. Hold it in place for 30 seconds. If using screws, align the mounting holes with your marks and drive the screws until snug—don't over-tighten, or you'll crack the cabinet or strip the holes. Step back and check that the fixture is level and positioned correctly before moving on. The light should shine directly onto the countertop without spilling onto the backsplash.
5. Wire the Connections. Most under-cabinet fixtures come with a junction box or wire connectors. Strip 1/2 inch of insulation from the end of your power wire and the fixture leads. Twist the black (hot) wires together and secure with a wire nut, then twist the white (neutral) wires and secure. If the fixture has a ground wire (bare copper), connect it to the ground wire from your power source or to a metal junction box. For hardwired fixtures with no connectors, connect each wire individually and secure the connections with wire nuts. Tuck all connections into the fixture's junction box or into a small plastic access box mounted nearby.
6. Tidy Up the Wire Path. Run the wire from the fixture toward the power source following your planned route. If running along the backsplash, use small cable clips or adhesive-backed hooks spaced every 8–12 inches to keep the wire tidy and off the countertop. If running inside the cabinet or through walls, drill holes at the top and bottom of the interior frame, feed the wire through, and secure it to the frame or wall studs with clips every 16 inches. Never let the wire lay loose across surfaces where it could be pinched by closing cabinet doors or damaged by contact with kitchen activity.
7. Power Up the Lights. If connecting to an existing outlet, use a plug-in connection: connect your fixture wire to a standard plug (purchased at any hardware store for $3–$5). Plug it into the outlet and test the light. This is the simplest method for most under-cabinet installations. If hardwiring to a wall outlet or a junction box, strip the sheathing from your wire and connect it to the outlet terminals: black wire to the brass terminal, white to the silver, and bare copper or green to the green/grounding terminal. Secure the outlet cover or junction box. If you're unsure about hardwiring, hire a licensed electrician for this step—it's quick work and worth the safety cost.
8. Chain Additional Lights. If you're adding a second or third light, mount and connect it the same way as the first. Many under-cabinet lights come with quick-connect plugs or connectors that let you daisy-chain multiple fixtures from a single power source. Snap the connectors together or run the wire from the first fixture to the second fixture's input terminal, securing the connecting wire with clips. This method is faster than running separate wires to each fixture and keeps the installation clean. Verify that the total wattage of all fixtures doesn't exceed the outlet or circuit capacity—most circuits handle 15 amps, which is roughly 1800 watts at 120 volts.
9. Verify Light Coverage. Turn the breaker back on or ensure the plug is connected. Test each light individually if there's a switch, or all at once if they're hard-wired in series. Walk around the kitchen and observe the light pattern on the countertop. The beam should illuminate the work surface evenly without harsh shadows or light spilling excessively onto the wall or backsplash. Adjust fixture angle slightly if supported by a pivot mount. If a light is too dim or too bright, you may need a different wattage bulb, but most LED under-cabinet fixtures come pre-set at an ideal brightness.
10. Finalize Wire Placement. Once all lights are tested and functioning, finalize wire routing with clips or tape. Any visible wire running down the backsplash should be secured every 8 inches with adhesive-backed clips; any wire inside the cabinet should be tied back with velcro cable ties so it doesn't interfere with cabinet use. If you run wire through the interior of a cabinet to reach an outlet behind an appliance, coil the excess wire neatly and secure it with clips to a cabinet frame member. Close cabinet doors and verify they open and close smoothly without catching on any wire.
11. Confirm All Systems Go. Turn the breaker back on (if hardwired) or plug in the fixture (if using an outlet). Let the lights run for 10 minutes and verify they're warm to the touch but not hot—this confirms they're operating normally. Check that no wires are warm or discolored. Turn off the lights using the dedicated switch or by unplugging if applicable. Clean up any dust or debris from the installation. Wipe down the cabinet undersides and countertop to remove any marks from the installation process.