No, a carbon monoxide (CO) detector does not detect a gas leak.
Carbon monoxide alarms are designed to detect carbon monoxide gas produced by faulty or incomplete combustion. They do not detect natural gas (methane) or LPG escaping from pipework or appliances.
This is a common misunderstanding and can leave gaps in your home’s safety if not properly understood.
What does a carbon monoxide detector detect?
A carbon monoxide detector is designed to monitor CO levels in the air. Carbon monoxide is:
- Colourless
- Odourless
- Produced when fuel does not burn correctly
These alarms are essential for protecting against poisoning from faulty boilers, fires, and appliances.
Why a CO detector will not detect a gas leak
Natural gas behaves very differently. It is not produced by combustion — it is the fuel itself.
Gas leaks occur when gas escapes from pipework, fittings, or appliances. Because of this, carbon monoxide alarms are not designed to detect it.
Natural gas is typically given a strong smell to help identify leaks, but it is also highly flammable and can pose a fire or explosion risk if it builds up in enclosed spaces.
What should you do if you suspect a gas leak?
If you smell gas or believe there may be a leak, contact the National Gas Emergency Service immediately on 0800 111 999 and follow their safety advice.
Once the situation has been made safe and the gas supply has been turned off, the next step is to identify exactly where the leak is within the system.
For a detailed explanation of how this is done, see how gas leaks are traced after isolation.
Why this misunderstanding matters
Relying on a carbon monoxide alarm to detect a gas leak can delay the correct response. While CO alarms are essential, they only protect against one specific type of risk.
Understanding the difference ensures your home is properly protected and that the right action is taken when needed.
Once a leak has been confirmed and the system has been made safe, our Gas Leak Detection service focuses on tracing the source accurately and resolving the issue without unnecessary disruption or pipe reruns.