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Outside Light Not Working
An outside light on your property has stopped working — it will not come on from the switch or automatically.
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What's happening?
Outdoor lights in the UK are exposed to weather, temperature extremes, and moisture, all of which cause them to fail more frequently than indoor lights. An outside light that has stopped working could have a blown bulb, corroded connections inside the fitting, a tripped circuit, or water ingress into the light fitting or junction box. If the light is controlled by a sensor (PIR), the sensor module may have failed rather than the light itself.
What usually causes it?
- Blown bulb or failed LED module inside the fitting
- Water ingress into the light fitting causing corrosion or a short
- Corroded or loose connections at the fitting or junction box
- Failed PIR sensor on a motion-activated light
- Tripped MCB or RCD at the consumer unit
Is it dangerous?
An outside light not working is low risk in itself. However, if water has entered the fitting, this could cause an earth fault on the outdoor circuit. If the RCD for the outdoor circuit keeps tripping, do not keep resetting it — the fault needs professional repair.
Can I fix it myself?
Check the consumer unit for a tripped MCB or RCD. Try replacing the bulb — outdoor bulbs fail more often due to temperature changes and moisture. If the light has a PIR sensor, check if it has an override setting (usually by switching off and on quickly). Check the fitting for any visible water inside or corroded contacts. If the fitting is sealed and you cannot access the bulb easily, call an electrician.
When should you call an electrician?
Call an electrician if replacing the bulb does not work, if there is water inside the fitting, if the outdoor circuit keeps tripping, or if the light is on a circuit you cannot identify. Also call if you need the light fitting replaced with a new one, as outdoor electrical work should comply with IP rating requirements.
What will the electrician actually do?
- Inspect the light fitting for water damage, corrosion, and seal integrity
- Test the circuit and connections at the fitting and junction box
- Replace the fitting if it is damaged or no longer weatherproof
- Replace or test the PIR sensor if the light is motion-activated
- Ensure the installation meets IP rating requirements for its location
What will it cost to fix?
£60–£160
A simple bulb or fitting replacement is at the lower end. If the cable or junction box needs replacing due to water damage, costs will increase.
Find an electricianFrequently asked questions
We’re happy to answer all your questions.
Why has my outside light stopped working?
The most common cause is a blown bulb — outdoor bulbs fail more often than indoor ones due to temperature fluctuations and moisture. If a new bulb does not fix it, the fitting or its connections may have corroded.
Can water damage an outdoor light?
Yes. Even lights rated for outdoor use can fail if the seals deteriorate over time. Water inside a fitting causes corrosion, short circuits, and eventually complete failure.
Why does my PIR light stay on all the time?
A PIR sensor stuck in the on position is usually either faulty or is being triggered by a heat source. Try switching it off for 30 seconds, then back on to reset it. If it persists, the sensor module needs replacing.
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