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Gas boilers

What to Do If You Smell Gas

Mains gas has a smell added so leaks can be detected. If you notice it, act straight away.

3 min read · Updated October 2026

Gas meter with its yellow emergency control lever, an open window and a phone

Do this immediately

If you smell gas:

  • Turn off the gas at the meter using the emergency control valve, if it's safe to do so
  • Open doors and windows to let fresh air in
  • Don't use electrical switches, doorbells or anything that could cause a spark
  • Don't smoke or use naked flames
  • Leave the property and call the gas emergency number from outside

The emergency numbers

In Great Britain, call the National Gas Emergency Service on 0800 111 999. In Northern Ireland, call 0800 002 001. The service is free and available 24 hours a day.

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Afterwards

The emergency service will make the situation safe but doesn't usually repair appliances. Any repairs to gas appliances or pipework must be carried out by a Gas Safe registered engineer before the supply is turned back on.

Common questions

Where is my emergency control valve?

Usually next to the gas meter, with a lever handle. When the lever is at right angles to the pipe, the gas is off.

Should I turn off my boiler if I smell gas?

Turn the gas off at the meter if safe, don't operate switches, and leave.

Who repairs a gas leak in my home?

A Gas Safe registered engineer.

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