How to Handle a Gas Leak Emergency
Last updated: 7 September 2026
Turn off the gas at the meter, open windows, evacuate, and call the National Gas Emergency Service on 0800 111 999.
Overview
A gas leak is a serious emergency that requires immediate action. This guide covers what to do if you suspect a gas leak in your home.
Step-by-Step Fix
Before beginning any repair, ensure you have isolated power or water supplies. Clear your workspace, gather standard hand tools, and wear appropriate personal protective equipment (PPE).
- If you smell gas or suspect a leak, immediately turn off the gas supply at the meter by turning the emergency control valve to the off position, which is usually a lever that should be at a 90-degree angle to the pipe. This stops any more gas from entering your property and reduces the risk of explosion.
- Open all windows and doors to ventilate the property and allow gas to escape. Do not use any electrical switches, including lights or appliances, as this could cause a spark and ignite the gas. Even turning a light switch on or off can create a small spark that could be catastrophic.
- Extinguish all naked flames, including cigarettes, candles, and pilot lights. Do not smoke or use any ignition sources anywhere near the property. If you have a pilot light on your boiler, do not attempt to relight it until the gas leak has been fixed by a professional.
- Evacuate the property immediately, ensuring everyone leaves the building. Do not use the telephone or mobile phone inside the property; use a mobile phone outside or a neighbours phone to call for help. Do not re-enter the property until it has been declared safe.
- Call the National Gas Emergency Service on 0800 111 999 to report the leak. This is a free 24-hour service. Do not turn the gas supply back on until a Gas Safe registered engineer has inspected and repaired the leak and confirmed it is safe to do so.
- If you are unable to turn off the gas at the meter, or if you are unsure how to do so, leave the property immediately and call the emergency service. Do not waste time trying to locate the meter if you cannot find it quickly.
- If you feel unwell, dizzy, or nauseous, seek fresh air immediately and seek medical attention. Carbon monoxide poisoning can occur alongside a gas leak and can be fatal. Symptoms include headaches, dizziness, nausea, and confusion.
- Do not attempt to find or fix the leak yourself. Gas leaks are extremely dangerous and can only be safely repaired by a Gas Safe registered engineer with the correct training and equipment.
- Once the emergency services have been called, wait outside the property at a safe distance. Inform the gas engineer or emergency services of any symptoms you or others may be experiencing.
- After the leak has been repaired, have your gas appliances serviced annually by a Gas Safe registered engineer to prevent future leaks. Regular maintenance is the best way to ensure your gas system remains safe.
Common Symptoms & Diagnostic Resolutions
Review the common error codes and operating symptoms below to quickly identify the root cause of the fault before ordering replacement parts.
| Symptom / Code | Likely Root Cause | Recommended Resolution |
|---|---|---|
| Strong gas smell | Gas leak from pipe or appliance | Turn off gas at the meter, open windows, evacuate, and call 0800 111 999 immediately. Do not use any electrical switches or ignition sources. |
| Gas meter dial spinning | Leak or appliance using gas | Turn off gas at the meter and call the emergency service. If the dial continues to spin with all appliances off, there is a leak. |
| Hissing sound from pipes | Gas escaping from a pipe joint or crack | Evacuate immediately and call 0800 111 999. Do not attempt to locate the source of the hissing sound yourself. |
| Dead or dying plants near gas pipe | Underground gas leak affecting soil | Call the National Gas Emergency Service on 0800 111 999. Do not dig near the area or attempt to investigate yourself. |
Frequently Asked Questions
What should I do if I smell gas?
Turn off the gas at the meter, open windows, evacuate immediately, and call the National Gas Emergency Service on 0800 111 999. Do not use any electrical switches or ignition sources.
Is it safe to use electrical switches during a gas leak?
No, any electrical spark could ignite the gas. Do not use any electrical switches, including lights, appliances, or doorbells. Even a mobile phone should be used outside the property.
How do I turn off the gas at the meter?
Locate the emergency control valve on your gas meter. This is usually a lever that, when turned to the off position, sits at a 90-degree angle to the pipe. Turn it until it stops.
How often should I have my gas appliances serviced?
You should have all gas appliances serviced annually by a Gas Safe registered engineer. This is essential for safety and can help prevent leaks and carbon monoxide poisoning.