Fitting a new light fixture is one of the more approachable electrical projects for a homeowner — but “approachable” does not mean risk-free. Working with electrical wiring requires turning off the circuit at the breaker, verifying the power is truly off with a non-contact voltage tester, and understanding the wire connections before touching anything. Done right, a fixture swap can take under an hour. Done wrong, it can cause a short, a shock, or a fire hazard that hides inside the ceiling. This guide walks you through the process and points out where the line between DIY and licensed-electrician territory falls.

Before You Start: Safety First

No step in this process matters more than cutting the power properly. Go to your electrical panel and flip the breaker that controls the room or the specific circuit for that fixture. Then use a non-contact voltage tester — a small, inexpensive tool available at any hardware store — to confirm there is no live voltage at the fixture wires before you touch them. Never rely on the wall switch alone to make a circuit safe; switches interrupt only one wire, and the other may still be live.

Colorado homes built before the 1970s may have aluminum wiring or older knob-and-tube wiring that requires special handling. If you uncover wiring that looks unfamiliar — wrapped in cloth rather than plastic insulation, or made of a silver-colored metal rather than copper — stop and call a licensed electrician. These older systems need specific connectors and techniques, and getting it wrong creates a fire risk.

What You’ll Need

  • Non-contact voltage tester (mandatory — do not skip this)
  • Flathead and Phillips screwdrivers
  • Wire strippers (if the new fixture wire ends need to be stripped)
  • Wire connectors (often included with the fixture)
  • A helper or a sturdy ladder — working overhead with both hands full is where most accidents happen
  • The new fixture’s instruction sheet — manufacturers vary in how they design the mounting bracket

Removing the Old Fixture

With power confirmed off, remove the old fixture’s cover or canopy to expose the electrical box and wiring. Most fixtures are held to the mounting bracket by one or two screws or a center nut — unthread these and support the fixture as it comes free. The fixture will hang by its wires; take a photo of how they’re connected before disconnecting anything. Standard residential wiring uses black (hot), white (neutral), and bare copper or green (ground). Unscrew the wire connectors and separate the wires.

Inspect the electrical box. It needs to be rated for the weight of your new fixture. A standard ceiling box is rated for fixtures up to 35 pounds. Heavier fixtures — chandeliers, ceiling fans — require a fan-rated box or a brace kit installed between joists. If the box isn’t adequate, address that before hanging the new fixture.

Installing the New Fixture

Attach the new mounting bracket to the electrical box using the hardware provided. Thread the new fixture’s wires through the bracket or canopy, then make your connections: black to black, white to white, and ground to ground (or to the green screw on the bracket). Twist the wire pairs together and secure with wire connectors — the connectors should cover all bare copper and hold firmly when tugged. Tuck the wires neatly into the box and secure the fixture to the bracket.

Install the appropriate bulbs (check the fixture’s maximum wattage rating — exceeding it is a fire hazard), restore power at the breaker, and test. If the fixture doesn’t light, confirm the wall switch is on and the bulbs are seated properly before troubleshooting further.

When to Call a Licensed Electrician

Call an electrician if: the box needs to be replaced or relocated; you find wiring that looks damaged, overheated, or unfamiliar; there is no ground wire in the box; the breaker trips when you restore power; or the circuit doesn’t respond to the breaker in a way you expect. These are not failure scenarios — they’re the moment where professional expertise protects your home. In Colorado, permitted electrical work that involves new wiring, panel modifications, or new circuit additions must be done by a licensed electrician under a permit and inspection.

Done’s electricians handle everything from simple fixture installations to full lighting upgrades and panel work across the Denver metro. If you’d rather have a licensed pro handle the installation — or if you’ve run into a complication — visit our lighting services page or our installations and remodels page to schedule service. For urgent electrical issues, our emergency electricians are available when you need them.