How to Find and Turn Off Your Stopcock

Your stopcock controls the whole water supply to your home. Finding it now, before you ever need it, is one of the simplest things you can do, since it limits damage from a future burst pipe or leak. Here’s exactly where to look and how to check yours works.

Where to look

Most UK homes have the internal stopcock in one of these spots:

• Under the kitchen sink — by far the most common location
• Downstairs toilet or utility room
• Airing cupboard
• Under the stairs
• Garage (if attached to the house)

Flats and some newer builds sometimes have it in a communal meter cupboard or a less obvious spot. If you genuinely can’t find it, a plumber can identify it for you during any routine visit, worth asking about if you’re already having other work done. This is worth checking if you’re in an older Wymondham conversion, where the stopcock can end up somewhere unexpected.

There’s usually also an external stopcock in a small covered box near the property boundary or under the pavement. That one typically needs a special key, and is more for the water company’s use. The internal one is the one you actually need for day-to-day emergencies.

What it looks like

It’s usually a small chrome or brass valve with either a crosshead handle, like a tap, or a lever. It sits on the pipe where your water supply enters the building, before it splits off to different taps and appliances.

How to turn it off

Turn the handle or lever clockwise (“righty-tighty”) until it stops. It should turn fairly smoothly on a stopcock that’s used often, although yours may be stiff with limescale or corrosion if you haven’t used it in years.

Turn firmly, but don’t force it. If it feels like it’s about to snap rather than turn, stop. A seized stopcock is a problem worth fixing now, not discovering mid-emergency.

Why testing it now matters

This is the part people skip. A stopcock that works fine in theory is no use if:

• You can’t find it quickly under pressure
• It’s seized from years of not being touched
• You’ve never actually turned it and don’t know which way is off

Take five minutes some ordinary afternoon to find yours, turn it off, and run a tap to confirm the water actually stops. Then turn it back on. If it’s stiff, hard to find, or doesn’t fully stop the flow, that’s worth sorting now. See our guide on what to do if a pipe bursts for the full emergency steps once your stop tap is confirmed working, or read how an emergency plumber handles a burst if yours has already let go.

If yours needs attention

A seized, hard-to-reach, or faulty stopcock is a quick, cheap fix, since it’s far better to sort now than to find out it doesn’t work while water is flooding your kitchen. Call an emergency plumber if yours has already failed mid-leak, or get in touch and we can check or replace it as part of any routine visit. We cover call-outs as far as the villages around Attleborough.

Make it a household habit, not just your job

Once you’ve found and tested your stopcock, make sure someone else in the household also knows where it is. This could be a partner, older children, a lodger, or whoever’s likely to be home when you’re not. A stopcock only you know about is far less useful if you’re away when something goes wrong. It’s a two-minute chat that could save serious damage.

A related check worth doing at the same time

While you’re checking your stopcock, it’s a good moment to also confirm you know how to read your water meter. This matters if you want to check for hidden leaks in future. See our guide on how to read your water meter for a simple leak-detection test you can run in ten minutes. This matters just as much for older properties around Dereham as it does anywhere else.