My dimmer switches buzz when I use LED bulbs — how do I fix this?

The buzzing is almost always a compatibility issue between your dimmer switch and the LED bulbs — and the fix is usually straightforward: replace either the dimmer, the bulbs, or both with components rated to work together.

Older dimmer switches were designed for incandescent bulbs, which work very differently from LEDs. Incandescent dimmers use a technology called TRIAC phase-cutting to reduce power, and most LEDs don't respond cleanly to that signal. The result is that tiny electrical fluctuations cause the LED's internal driver to vibrate at an audible frequency — that annoying buzz you're hearing. The fix isn't complicated, but it does require choosing the right components.

Start with the bulbs. Not all LED bulbs are created equal when it comes to dimming. Look for bulbs explicitly labelled "dimmable" — non-dimmable LEDs will almost always buzz or flicker. Better yet, check the bulb manufacturer's website for a compatibility list. Brands like Philips Hue, Cree, and GE have published lists of tested dimmer models. Swapping to a higher-quality dimmable LED (expect to pay $8–$15 per bulb) often solves the problem on its own.

If new bulbs don't fix it, replace the dimmer. Look for a dimmer specifically designed for LED loads — Lutron's Caseta and Maestro lines and Leviton's Decora Smart series are popular choices that work well with a wide range of LED bulbs. These typically cost $25–$60 at your local Home Depot or electrical supply house. When you're shopping, check the dimmer's minimum load rating — many LED dimmers have a minimum of 10–25 watts, and if you're only running a few low-wattage LEDs, you might fall below that threshold, which also causes buzzing.

One more thing to check: the load. If you have multiple LEDs on a single dimmer, add up the total wattage and make sure it falls within the dimmer's rated range (both minimum and maximum). Running too few watts is just as problematic as overloading.

Vancouver-Specific Note

In BC, replacing a dimmer switch is considered electrical work regulated by Technical Safety BC (TSBC). Homeowners are generally permitted to do minor electrical work on their own principal residence — swapping a like-for-like switch or outlet is typically within that scope — but you should verify this with TSBC directly if you're unsure. If you're uncomfortable working in the panel or with wiring, or if the buzzing is coming from the panel rather than the fixture, that's a job for a licensed electrician. All electrical contractors in BC must be licensed through Technical Safety BC and carry WorkSafeBC coverage.

If you're doing a broader lighting upgrade — installing smart dimmers, adding circuits, or upgrading a panel — you'll need a licensed electrician and a permit pulled through your local municipality's building department.

Your next steps: Start cheap — try a different dimmable LED bulb first. If the buzz persists, pick up an LED-rated dimmer like a Lutron Maestro (around $30–$45) and swap it out. If you're not comfortable doing the swap yourself, a licensed electrician can handle it in under an hour — expect to pay $100–$175 for a simple dimmer replacement in Metro Vancouver, including labour.

Browse licensed electricians in our directory at the Vancouver Construction Network if you need a hand.