Service
Dimmer switch installation
With LEDs, a dimmer works only if it matches the bulbs. Most flicker complaints start there.
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Written by HyreElectrical Research Desk Primary-source research and fact checking
The short answer
Dimmer switch installation is a job for a licensed electrician: a dimmer listed for the bulbs’ type and load replaces a switch, with a neutral connection for many smart models and matching companions for three-way control. LED dimmers list compatible bulbs and a minimum load; below it, lights flicker or will not turn fully off.
LED compatibility
Check the dimmer maker’s compatibility list for your bulbs. Trailing-edge (ELV) dimmers often suit LEDs better than older leading-edge models.
Minimum load matters: a single small LED may be below it.
What the job includes
Turning off the circuit, replacing the switch with the dimmer, connecting a neutral if required, and setting low-end trim. Three-way setups need a matching companion at the other location.
See dimmer switch and three-way switch.
Permit, time and what changes the price
Swaps are often treated as repair.
Price drivers: number of dimmers, smart models, missing neutral, ganged boxes. No price ranges are published here until we hold enough sourced, dated quotes; see cost guides.
Heat
CPSC notes some dimmers warm in normal use. Ganged dimmers need derating per the maker. A hot or buzzing dimmer needs checking.
Check the license on your state board before anyone starts: how to check an electrician license.
Smart dimmers
Smart dimmers add scheduling, voice control and app control. Many need a neutral in the box, which older switch boxes may lack. Some models are made for boxes without a neutral; check the listing before buying.
For a three-way smart setup, makers usually pair the main dimmer with a wireless or wired companion. Mixing brands often fails.
If lights still flicker after a compatible dimmer is installed, the low-end trim setting can usually fix it. If not, the bulbs may be the issue; see flickering lights.
What a fair written quote lists
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Questions
Why do my LEDs flicker on a dimmer?
Do dimmers need a neutral?
Can I dim from two places?
Is a warm dimmer normal?
Written and audited by
HyreElectrical Research Desk
Primary-source research and fact checking
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This page is general information, not a diagnosis or a quote. Code rules vary by the NEC edition your state or city adopted and its local amendments.