What usually causes this?
Loose or failing bulb
The simplest fix. LED bulbs can also flicker as they fail.
Incompatible dimmer
Older dimmers aren't designed for LED loads and cause flicker or buzzing.
Loose fixture or switch connection
Loose wires at the fixture or switch cause intermittent contact.
Circuit overload or voltage drop
Heavy appliances starting can cause momentary dips, especially on shared circuits.
Loose neutral or service issue
Flicker throughout the house — especially with some lights brighter — can signal a loose neutral at the panel or meter.
What you can safely check
These details help an electrician find the cause faster. Look and listen only — do not remove covers or touch wiring.
- One fixture or many?
- Does it happen when AC, dryer or microwave starts?
- Is the light on a dimmer?
- Do some lights get brighter while others dim?
- Did it start after a storm?
Warning signs that need a professional
- Flicker across many rooms
- Lights brightening unexpectedly
- Burning smell or buzzing
- Warm switches or fixtures
- Flicker plus frequent breaker trips
When should you call an electrician?
Call an electrician if flickering affects more than one fixture, comes with buzzing or warmth, or happens with lights getting brighter as well as dimmer. These point to loose connections or service problems that can damage electronics and create heat.
If the flicker is limited to dimmed LEDs, an LED-compatible dimmer often solves it.
Services that fix this problem
Electrical Troubleshooting
Systematic testing to find the cause of intermittent power loss, tripping, flickering and other electrical faults that aren't obvious.
Electrical Repair
Diagnosis and repair of dead circuits, failing outlets and switches, tripping breakers and other everyday electrical faults in your home.
Light Switch Installation
Installing and replacing switches, dimmers, three-way and four-way switches, timers and smart switches.
Electrical Panel Services
Repairs, inspections and maintenance for breaker panels — loose connections, damaged breakers, labeling and capacity checks.
Related electrical problems
Frequently asked questions
Large motors draw a surge when they start. A brief dip can be normal, but noticeable flicker may indicate an overloaded circuit, undersized service or loose connection.
Often it's a dimmer compatibility issue, which is more nuisance than hazard. Flicker with heat, buzzing or across many rooms should be checked.
Yes, when caused by loose connections that generate heat.
Yes. If neighbors see it too, contact the utility. If only your home, an electrician should check.