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Quick answer
The emergency gas shut-off valve, called the emergency control valve (ECV), is usually a lever handle located right next to your gas meter, turned a quarter-turn to close it and cut gas supply to the whole property. Knowing where it is before you need it matters, since in a genuine gas emergency, smelling gas or a sounding alarm, you should turn it off, ventilate, leave the property and call the National Gas Emergency Service on 0800 111 999.
Key takeaways
- The emergency control valve (ECV) is generally located immediately next to the gas meter, either inside the property in a meter cupboard, or outside in an external meter box.
- It is typically a lever handle: in line with the pipe means open, and a quarter-turn so the lever sits across the pipe means closed.
- Knowing its location before an emergency, not during one, is the whole point of this guide; do not wait until you smell gas to go looking for it.
- Turning off the ECV cuts gas to every appliance in the property, not just one; this is deliberate, since a genuine gas emergency needs the whole supply isolated, not a partial fix.
- Once off, the supply should only be turned back on and any affected appliances re-lit by a Gas Safe registered engineer, not done casually by a homeowner.
Knowing where your emergency gas shut-off valve is, and how to operate it, is one of those pieces of household knowledge that matters enormously in the rare moment you actually need it, and is worth five minutes now rather than a panicked search later.
What the emergency control valve actually is
The emergency control valve, commonly called the ECV, is the point where you can manually cut off the entire gas supply into your property in an emergency. It is a legal requirement for every domestic gas installation to have one, and it is almost always located immediately next to, or as part of, the gas meter itself, since that is the single point the whole property’s gas supply passes through.
Where to find yours
In most UK homes, the gas meter, and therefore the ECV, sits in one of a few common locations: an internal meter cupboard, often near the front door, under the stairs, or in a hallway; an external meter box built into an outside wall, commonly near the front of the property; or, in some older or larger properties, a dedicated meter room or outbuilding. If you genuinely do not know where yours is, this is worth finding out now, not during an emergency; check any meter cupboard or external box first, since that is where the vast majority of ECVs are located.
What it looks like and how it works
The ECV is typically a lever-style handle, distinct from the smaller, individual isolation valves you might see on specific appliances. When the lever sits in line with the pipe, the valve is open and gas is flowing normally. Turning it a quarter-turn, so the lever now sits across the pipe rather than in line with it, closes the valve and cuts gas supply to the entire property. This quarter-turn design is deliberate: it is quick and simple to operate even under stress, without needing tools or specialist knowledge.
When to use it
The clear-cut case is a genuine gas emergency: you smell gas, or a carbon monoxide alarm sounds alongside other signs of a gas problem. In that situation, turn off the ECV, do not operate light switches or use a naked flame anywhere in the property, open windows and doors to ventilate as you leave, get everyone out, and call the National Gas Emergency Service on 0800 111 999 from outside the property. This same emergency response is covered in more general terms in our guide on what to do if you smell gas; this guide focuses specifically on the ECV itself.
What not to do
Do not attempt to investigate the source of a suspected gas leak yourself before turning off the supply; isolating the gas comes first. Do not turn any electrical switches on or off, including light switches, since a spark in the presence of a gas leak is a genuine ignition risk; if lights are already on, leave them on and leave them off if already off, rather than touching the switch either way. Do not use your mobile phone inside the property if you suspect a leak; step outside first.
Turning the supply back on afterwards
Once the ECV has been turned off in a genuine emergency, do not simply turn it back on yourself once you believe the smell has cleared or the immediate danger has passed. The supply should be turned back on, and any appliances that were affected re-lit and checked, by a Gas Safe registered engineer or the gas emergency service, who can confirm it is genuinely safe to restore rather than you guessing based on smell alone.
Book with Gasmaster
Not sure where your emergency control valve is, or want your gas installation properly checked? Gasmaster Plumbing & Heating, Gas Safe registered (220932), covers Stoke-on-Trent, Newcastle-under-Lyme and Stafford. Get in touch through our gas engineers page, or call our emergency boiler repair service if you have an urgent gas concern right now.
Frequently asked questions
Is the emergency control valve the same as my boiler’s isolation valve?
No, the ECV cuts gas to the whole property at the meter; your boiler will also have its own separate, smaller isolation valve nearby, used by engineers for isolating just the boiler during servicing or repair work, not the whole property’s supply.
What if I can’t find my meter or ECV?
Check internal cupboards near the front door or under stairs, and any external meter box on an outside wall; if you genuinely cannot locate it, your gas supplier or a Gas Safe engineer can help you identify it during a routine visit, which is worth resolving before you need it in an emergency.
Can I turn the ECV off myself if I just want to isolate the gas for other reasons, not an emergency?
The ECV can be used to isolate gas supply generally, but for planned work, an engineer will typically use it or appliance-specific isolation valves as appropriate; it is not something to switch off and on casually without good reason.
Does turning off the ECV affect my electricity?
No, the emergency control valve only affects the gas supply; your electricity supply and consumer unit are entirely separate.
Who turns the gas back on after an emergency shut-off?
A Gas Safe registered engineer or the gas emergency service should confirm it is safe and turn the supply back on, rather than a homeowner doing this themselves after a genuine emergency.
Sources
- National Gas Emergency Service, 0800 111 999
- Gas Safe Register (gassaferegister.co.uk)
- Health and Safety Executive, HSE (hse.gov.uk)
Related services
Abdul runs Gasmaster Plumbing & Heating and has worked on boilers, heating and gas appliances across Stoke-on-Trent since 2005. He is Gas Safe registered (reg. 220932), and these articles come from his day to day work in homes and businesses across Staffordshire, Cheshire and Derbyshire.
