High risk
Your consumer unit or fuse box is making a buzzing or humming noise that was not there before.
Low risk
Your dimmer switch makes a buzzing or humming noise, especially when the lights are dimmed.
You can hear a buzzing, crackling, or humming sound coming from inside a wall. This could be harmless mains hum or a sign of dangerous electrical arcing that needs urgent attention.
Your ceiling light or light fitting is making a buzzing or humming noise.
A plug socket in your home is making a buzzing, crackling, or humming noise.
Caution
You can hear an electrical humming or droning noise at night that is not there during the day.
There is a persistent low-frequency hum or drone throughout your house that seems to be electrical.
Describe the job and get a fixed price from a local electrician.
