Emergency Utility Shutdown Procedure (UK)

The only sensible time to find your stop tap is not when water is coming through the kitchen ceiling.

Most households have never located their internal stop tap, opened the consumer unit, or turned the gas isolation valve. There is no reason to in normal life — those things sit in cupboards and under sinks for years, untouched. The problem is that emergencies don’t give you time to search. When floodwater is approaching the sockets, or you can smell gas, the minutes you spend looking for the right valve are minutes you didn’t have.

This guide covers three things: where your shut-off points are (go and find them now, before you need them), when to use them, and exactly how to do it safely for each utility. Ten minutes with this guide and a walk around your home is worth more than any amount of reading in an emergency.

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Find Your Shut-Off Points Before You Need Them

This is a drill, not a guide. Do it now. Put the kettle on afterwards.

What you’re looking for

• Internal stop tap — controls your water supply. Usually under the kitchen sink. Sometimes in an airing cupboard, under the stairs, or near the boiler. Turn it clockwise to close. Check it moves freely — a seized stop tap during a burst pipe is a serious problem.
• External stopcock — controls your water supply at the point it enters the property from the mains. Located in a small covered access pit in the pavement, path, or front garden, usually close to your boundary. The cover is often stiff or jammed — you’ll need something to lever it open. The valve itself sits 75–100cm down and requires a stopcock key to operate. This is your backup if the internal stop tap is seized, inaccessible, or has failed. Many households don’t know it exists. Find yours now, before you need it.
• Consumer unit (fuse box) — controls your electricity. Usually in the hallway, under the stairs, or in the kitchen. The main isolator is the large switch at the top or side. Note where it is and make sure you can reach it safely in the dark.
• Gas emergency control valve — a quarter-turn valve next to your gas meter. The meter is often in a cupboard near the front door, in a kitchen, or in an external meter box. The valve handle runs along the pipe when open and across it when closed. Know what it looks like open before you need to close it.

Write the locations down. Put it somewhere useful — inside a kitchen cupboard door, on the inside cover of your emergency folder, wherever you’d actually look. Then tell everyone in the household.

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When to Shut Off — and When Not To

Shut off immediately if

• Floodwater is approaching sockets, appliances, or the consumer unit — even shallow water can energise electrics
• You can smell gas or hear hissing near pipework or the meter
• Fire or severe smoke damage has occurred — heat weakens pipes and wiring even after the fire appears out
• A burst pipe or uncontrolled leak is running water into walls, ceilings, or near electrical fittings
• Storm damage has affected where services enter the building — fallen trees, cables under tension, or visible damage to the meter

Do not shut off blindly if

• You depend on powered medical equipment — oxygen concentrators, powered hoists, refrigerated medication. Shutting off electricity removes your safety net. Call emergency services first and ask for guidance before touching the consumer unit.
• You live in a flat with shared services — isolating a communal supply affects your neighbours. Find your isolation points only (see the section on flats below).
• You cannot safely reach the shut-off point — standing water, active fire, smoke, or structural instability between you and the valve. Never put yourself at risk to reach a switch. Call emergency services instead.

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Gas — How to Shut It Off Safely

Shut off gas if you

• Can smell sulphur or “rotten egg” — the odorant added so leaks are detectable
• Hear hissing near the meter or pipework
• Feel dizzy or lightheaded without another explanation
• Have had fire or significant structural damage that could have affected the pipework

How to do it

1. Open windows and doors immediately — ventilate the space
2. Do not touch any electrical switches, sockets, or devices — not even to turn them off
3. Do not use a naked flame
4. Locate the gas meter and find the emergency control valve — the quarter-turn handle next to the meter
5. Turn it a quarter turn so the handle sits across the pipe (horizontal) — this closes it
6. If the smell persists or you feel unwell, leave immediately

📞 National Gas Emergency Service: 0800 111 999 — free, 24 hours. Call from outside the property if possible.

Do not turn the gas back on yourself. This must be done by a Gas Safe registered engineer after the property has been checked. This is not optional — reinstating gas without inspection after a suspected leak is dangerous and potentially illegal.

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Electricity — How to Shut It Off Safely

Shut off electricity if you have

• Floodwater near sockets, appliances, or the consumer unit
• Water leaking through the ceiling into light fittings or running down walls with cables
• Unexplained burning smells, sparking, or buzzing from the consumer unit or sockets
• Structural damage after a storm that may have affected wiring

How to do it

1. Check you can safely reach the consumer unit — it must be dry and there must be no standing water between you and it
2. Open the consumer unit cover if it has one
3. Switch the main isolator to OFF — this is usually the large switch at the top right of the unit, sometimes labelled “Main Switch” or “Isolator”
4. This cuts power to everything in the property

If you cannot safely reach the consumer unit — because of water, fire, or smoke — do not attempt it. Call 999. The Fire Service can advise on safe isolation or do it for you.

A note on smart meters: they don’t change the process. The consumer unit is still your isolation point. The smart meter’s in-home display going dark is not the same as the power being off.

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Water — How to Shut It Off Safely

Shut off water if you have

• A burst pipe or fitting spraying or flowing water uncontrollably
• Water running through a ceiling, particularly near electrical fittings
• A severe internal leak that is causing structural damage or approaching the consumer unit
• Floodwater entering the property via the plumbing or drains backing up

How to do it

1. Find the internal stop tap — usually under the kitchen sink, sometimes in the airing cupboard or under the stairs
2. Turn it clockwise until it stops — this closes the valve and cuts the mains supply into the property
3. Open the lowest cold tap in the house to drain any remaining pressure

If the internal stop tap is seized or inaccessible

Painted over, rusted solid, or simply impossible to reach in an emergency — it happens more often than it should. The backup is the external stop tap, located in a small covered pit in the pavement or path outside your property (sometimes shared with a neighbour).

The external stop tap requires a stopcock key — a long T-bar tool designed to reach valves buried up to a metre underground. Standard UK valves use a crutch head fitting. Without the right tool, you cannot close the external stop tap by hand.

This is one of those items worth owning before you need it — not after you’re standing in the street watching water run under your front door.

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Flats, Rented Properties, and Council Homes

The isolation rules above assume you have direct access to your own services. In shared buildings, it is more complicated.

What is usually yours

• Electricity: Most flats have an individual consumer unit inside the property — this is yours to isolate. There may also be a communal supply for shared areas (lighting, lifts, entry systems) — leave that alone.
• Gas: Individual gas meters per flat are common in older blocks. In newer buildings, gas is sometimes communal. Know which yours is — check your utility bills if unsure.
• Water: Your flat may have an isolation valve under the kitchen sink for the internal supply, but the building’s main stopcock is typically in a communal cupboard or plantroom — controlled by the building manager, not you.

What to do in a water emergency in a flat

• Use your internal isolation valve if you have one
• Call your housing provider, managing agent, or building manager immediately — they control the communal supply and have out-of-hours emergency lines
• Keep those numbers somewhere accessible, not just saved in your phone

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After You’ve Shut Off — What Comes Next

Isolating a utility is step one. Depending on what you’ve shut off and why, you may now be managing without power, gas, or running water for hours or days while repairs are assessed or engineers attend.

• No electricity — you’re in a power cut scenario. Lighting, heating, cooking, and any powered medical equipment all need a plan.
• No gas — central heating and gas cooking are offline. Alternative heat sources become important quickly, particularly for households with young children or elderly residents.
• No water — stored water becomes immediately relevant. Three litres per person per day as a minimum. Don’t forget pets.

Before anything else: photograph the damage. Every room affected, every fitting, every visible cause. Before you move anything, before anyone starts cleaning up. Your insurer will need it.

Frequently Asked Questions