Gas leaks

Gas leaks are very dangerous in the home. Carbon monoxide (CO) is a colourless, odourless, poisonous gas that can be given off as a result of the incomplete burning of gas by household appliances. Reports or actual escapes of CO are responded to and made safe at no charge by the relevant Gas Transporter / Emergency Service provider responsible for the network.

If you believe you have a gas leak

  • Shut off the gas at the main supply by turning the lever next to the meter to the horizontal position.
  • If gas continues to leak, call the National Grid Gas Emergency freephone number 0800 111 999.
  • Open all windows and doors to let the gas escape.
  • Do not switch any lights and electrical appliances on or off, light a match or smoke until all the gas has gone.
  • If the leak came from a cooker or fire that was not lit, turn it off before you turn the mains back on.
  • Re-light any pilot lights when the gas is safe to turn back on.

How long will you have to wait for an engineer to arrive?

National Grid aims to attend all uncontrolled escapes within one hour, and all controlled escapes within two hours. A controlled gas escape is where the person reporting it has confirmed that the gas emergency control valve serving the premises has been turned off and the smell of gas has gone. An uncontrolled gas escape covers all others.

What if the gas leak is in my home?

National Grid engineers will always ‘make safe’ when called to a suspected gas escape. However, the emergency service provided by National Grid under the terms of its licence doesn’t cover repairs to appliances or installation pipework which can’t be completed within 30 minutes.

What do I do next?

Once the property has been made safe, the engineer will explain that any work on appliances (such as cookers, boilers or fires) has to be carried out by a Gas Safe (formerly CORGI) registered engineer. Report the problem to the repairs service department freephone number 0800 1123 444 or our emergency out of hours number 01438 314963 outside of office hours.