Most flickering lights come down to one of four things: a loose or failing bulb, an LED lamp that does not suit the dimmer, a big appliance briefly pulling the voltage down, or a loose connection in a switch or fitting. The first three are a nuisance. A loose connection is a fire risk, and so is flickering across the whole house that comes with lights going brighter and dimmer, which can point to a supply fault.
The trick is to notice the pattern. Which lights flicker, when they do it and whether anything else is happening at the same time tells you most of what you need to know before anyone opens a switch.
This guide is for homeowners and tenants trying to work out whether flickering lights are a nuisance or a fault. It covers the safe checks you can do yourself; anything behind a switch plate, ceiling rose or consumer unit cover is a job for an electrician.
What the Flicker Is Telling You
| What you notice | Likely cause | What to do |
|---|---|---|
| One bulb flickers, the rest are fine | Loose or failing lamp, or a worn lampholder | Switch off, let it cool, reseat or swap the bulb |
| LEDs flicker or strobe on a dimmer | Dimmer not compatible with the LED lamps, or the load is below the dimmer's minimum | Fit an LED-compatible dimmer or dimmable lamps rated for it |
| Lights dip when the kettle, shower or washing machine starts | Large load briefly pulling the voltage down | A slight dip is normal; a big or worsening one needs checking |
| One room or circuit flickers, often when a switch is touched | Loose connection at a switch, ceiling rose or junction box | Stop using it and get it checked |
| Lights get brighter and dimmer around the whole house | Possible supply or neutral fault | Turn off sensitive equipment and call 105 straight away |
| The whole street flickers | Fault on the local network | Call 105 or check our power cut checker |
LED Lights Flickering
LED lamps are one of the most common causes of flickering, usually after someone has swapped old halogen or filament bulbs for LEDs but kept the old dimmer switch. Older dimmers were designed for much higher loads than a handful of LEDs draw, so the LEDs strobe, flicker at low settings or will not dim smoothly. The fix is an LED-compatible dimmer and lamps marked as dimmable, ideally from the dimmer maker's compatibility list. Replacing the dimmer is usually the better first move than swapping bulbs: a new set of lamps only helps if they happen to suit the old dimmer, while a modern LED dimmer matched to the lamps fixes the cause and lets you dim them smoothly. If you never dim the lights, a plain on/off switch is the simplest cure of all. Cheap LED lamps can also flicker as their internal driver fails, which is why one lamp in a set sometimes starts misbehaving long before the others.
Buzzing Light Switches and Dimmers
A low hum from a dimmer driving LEDs is common and usually goes away with a compatible dimmer. A buzz or crackle from an ordinary on/off switch is different. It means current is jumping across a gap that should be a tight connection, which heats the terminal and can scorch the switch or the cable behind it. If a switch buzzes, crackles, feels warm or looks discoloured, stop using it and get it checked.
When It Is Urgent
Turn the circuit off at the consumer unit and call an electrician if flickering comes with any of these:
- A burning smell, scorch marks or a switch or socket that feels warm
- Crackling or buzzing from a switch, socket or fitting
- A tingle or shock when you touch a light switch
- Lights going noticeably brighter as well as dimmer, especially when appliances switch on
Electrical Safety First lists the same warning signs: crackling from light switches or sockets, and scorch marks or discolouration around light fittings, which should be checked by a registered electrician.
Lights getting brighter as well as dimmer can mean a problem with the neutral connection on the supply. The neutral is the conductor that carries current back to complete the circuit, and when it fails the voltage in the house can swing high and low, which damages appliances and is dangerous. Call 105 as well: Ofgem's guide to power cuts explains that this free number puts you through to your local electricity network operator, and the Energy Networks Association lists who that is for your postcode. Our emergency electrician team covers Tunbridge Wells and the surrounding area for faults like this.
Safe Checks You Can Do Yourself
- Note exactly which lights flicker and when: one lamp, one room, or the whole house.
- For a single lamp, switch it off, let it cool and check it is screwed or pushed in firmly, then try a new one.
- If the flickering lights are on a dimmer, try a non-dimmable fitting or turn the dimmer to full to see if it stops.
- Ask a neighbour whether their lights are doing the same.
- Stop there. Do not take switch plates or fittings off yourself; the checks beyond this point need the circuit isolated and tested.
If a light or socket has stopped working altogether rather than flickering, the problem is often a tripped breaker or RCD. Our tripping fault finder and guide to why an RCD keeps tripping walk you through the safe checks.
When Flickering Points to Older Wiring
Flickering that keeps coming back on several circuits, alongside an old fuse board, warm sockets or rubber-insulated cable, is often a sign the installation is ageing. An EICR will find loose connections and worn wiring before they cause damage, and our guide to the signs your home needs rewiring covers what else to look out for. If your fuse board is the weak point, a consumer unit replacement may be the right fix.
Getting Flickering Lights Fixed in Tunbridge Wells
Our team traces lighting faults, replaces dimmers and switches, and fits LED lighting that is matched to its controls so it does not flicker in the first place. We cover Tunbridge Wells, Tonbridge, Sevenoaks and the wider Kent area. Get in touch and tell us what the lights are doing, and we will tell you how urgent it is.