Gas leaks and carbon monoxide
What to do if you smell gas, and how to protect against carbon monoxide.
If you smell gas
- Do not use switches, flames or anything that could spark.
- Open doors and windows, turn off the gas at the meter if you can, and get out.
- From outside, call 0800 111 999 (Great Britain) or 0800 002 001 (Northern Ireland).
- Do not go back in until you are told it is safe.
Carbon monoxide
- You cannot see or smell it. Fit an alarm in every room with a fuel-burning appliance and test it monthly.
- Have boilers and fires serviced by a Gas Safe registered engineer.
- Headaches, dizziness or nausea that ease when you leave home can be a sign. Get everyone outside and call 999 if anyone is unwell.
Official information
Checked against official guidance on 28 Oct 2026. In immediate danger, call 999.
Next: Fire at home