How to Install Under Cabinet Lighting | A Straightforward Guide

Installing under cabinet lighting involves planning the layout, verifying power access, mounting the fixtures, connecting power, and testing — with the main safety divide being whether you choose low-voltage plug-in or hardwired line-voltage systems.

Under cabinet lighting changes how a kitchen works, turning shadowed counter space into a genuinely usable area. The process isn’t complicated, but the right approach depends entirely on which type of lights you’re working with. Adhesive LED strips and plug-in puck lights are weekend projects. Hardwired bar lights require electrical box work, a power shutoff, and a voltage tester. Here is the sequence for both, with the pitfalls that trip up most first-timers.

Plan the Layout and Check Power Reach

Before buying or mounting anything, measure the cabinet bottom and confirm the lights will fit. Then map the route from each light to the nearest power source — a 15-amp outlet on an adjacent wall or a nearby room’s receptacle circuit usually works. The single most common mistake happens right here: mounting the lights first and discovering the cable won’t reach the outlet. Lay the fixture under the cabinet, trace the cable path, and confirm the length before you drill or stick anything.

Mount the Fixtures: Two Routes

For Adhesive or Plug-in Kits

The sticking point, literally, is the surface prep. Clean the underside of the cabinet thoroughly — grease and kitchen dust are invisible adhesive killers. Wipe with rubbing alcohol and let it dry completely. Peel the backing and press the strip or puck into place, holding firm for about 30 seconds. If the kit uses mounting clips or brackets, mark the hole positions with a pencil, drill a shallow starter hole so the screw doesn’t split the cabinet bottom, and secure the cap. Lowe’s guidance recommends positioning the lights toward the front edge of the cabinet, so the light falls on the counter rather than washing the backsplash. Route the wires to the outlet, leaving a bit of extra slack at openings. Plug in and test before finalizing the cable path.

For Hardwired Systems

This route demands a power shutoff at the breaker. Confirm the circuit is dead with a voltage tester — not a no-contact tester alone, but one that tests the actual wire. The wiring is straightforward: splice white-to-white, black to the fixture’s line (often black or the labeled color), and connect the ground to the switch and any metal box present. Home Depot’s guide notes that if the fixture uses a metal box, ground it appropriately. Use cable clamps or knockout fittings so the sheathing, not the individual wires, is secured at each opening. Avoid using a dimmer switch with fluorescent fixtures if that is your light type — the wrong control can damage the bulb and the switch both. If you have any doubt about what you are connecting, a licensed electrician is the right call for this part.

Test Before You Button Up

Restore power and turn the lights on before you snap cover plates, push wires into the junction box, or fasten trim. It is far easier to swap a bad connection or a dead LED strip now than after everything is closed up. Plug-in systems are simple: if the light doesn’t come on, check the outlet and the connection. For hardwired systems, a light that won’t light after a correct splice usually points to a loose wire nut or a missed ground — kill the power again and verify every connection. When it works, the payoff is immediate.

If the results make you think about upgrading the whole kitchen, our tested roundup of the best cabinet lighting options covers what performs well for different layouts and budgets.