Emergency Plumbing: What to Do Before the Plumber Arrives

Plumbing emergencies usually happen at the worst possible time. Burst pipes, leaks, blocked toilets, or no hot water — it’s stressful, and your first instinct is often to panic. But if you know what to do in the first few minutes, you can minimise the damage and make the repair simpler (and cheaper).

Here’s a practical guide to the most common plumbing emergencies and what to do before help arrives.

Step one: turn off the water

If water is pouring out somewhere it shouldn’t be, your first priority is to stop it. There are two main shut-off points you should know about:

1. Stopcock (mains water supply)

This controls the water supply to your entire house. It’s usually located:

• Under the kitchen sink
• In the downstairs toilet
• In a utility room or cupboard near the front door
• Outside near the boundary of your property (sometimes in a box in the pavement)

Turn it clockwise to close it. This will stop all cold water coming into the house.

Once it’s off, open the cold taps to drain any remaining water from the pipes.

2. Boiler/hot water isolation valve

If the problem is with the hot water (e.g., a leak from the boiler, cylinder, or hot water pipe), you may be able to isolate just the heating system without turning off the whole house supply.

• Look for an isolation valve on the pipes near the boiler or hot water cylinder.
• Turn it clockwise to close.

If you’re not sure where these are, turn off the main stopcock instead.

Common emergencies and what to do

Burst pipe

What to do:

1. Turn off the stopcock immediately.
2. Turn off the central heating (if the burst is from a heating pipe).
3. Open taps to drain water from the system.
4. Move anything valuable away from the leak and try to catch the water in a bucket or towel.
5. Take photos for insurance if needed.

Don’t:

• Try to repair the pipe yourself with tape or glue — it’s a temporary fix at best and may make the proper repair harder.

See: Leak Repairs

Major leak (from boiler, cylinder, or under the floor)

What to do:

1. Turn off the stopcock and the boiler.
2. If water is pooling, mop it up or contain it with towels.
3. If the leak is from the boiler or hot water cylinder, check if there’s an isolation valve nearby and turn it off.
4. Call a plumber immediately — leaks from boilers or cylinders can cause significant damage quickly.

See: Emergency Repairs

Blocked toilet (overflowing)

What to do:

1. Stop flushing. Every flush adds more water.
2. Turn off the water supply to the cistern (there’s usually an isolation valve on the pipe feeding the cistern).
3. If you don’t have a valve, lift the lid off the cistern and manually hold up the float to stop water flowing in.
4. Try a plunger (not a sink plunger — use a proper toilet plunger with a flange).

Don’t:

• Use chemical drain unblockers in a toilet if it’s already overflowing — it just adds chemicals to the water you’re trying to clear.

If plunging doesn’t work, call a plumber. See: Drainage

No hot water

What to do:

1. Check the boiler display for error codes.
2. Check the boiler pressure (should be around 1–1.5 bar). If it’s too low, you may be able to top it up using the filling loop (check your boiler manual).
3. Check that the boiler hasn’t switched itself off (some models have a reset button).
4. If you have a hot water cylinder, check the immersion heater hasn’t tripped.

If none of this helps, there’s likely a fault with the boiler or heating system. See: Plumbing

Frozen pipes

What to do:

1. Turn off the stopcock (frozen pipes can burst when they thaw).
2. Open taps to relieve pressure.
3. Gently warm the frozen section with a hairdryer or warm (not boiling) water. Start from the tap end and work towards the frozen section.
4. Never use a blow torch or open flame.

If a pipe has already burst due to freezing, follow the steps under “Burst pipe” above.

Boiler leaking

What to do:

1. Turn off the boiler immediately.
2. Turn off the water supply to the boiler (if there’s an isolation valve).
3. Call a Gas Safe registered engineer — boiler leaks can indicate a serious fault and should not be ignored.

Don’t:

• Try to fix the boiler yourself.
• Leave the boiler running.

See: Emergency Repairs in Middlesbrough

What counts as a plumbing emergency?

Not every plumbing issue needs an emergency callout. Here’s a rough guide:

Emergency (call immediately):

• Burst pipe or major leak
• No heating or hot water in winter (especially if you have young children or elderly/vulnerable people in the house)
• Boiler leaking or showing a gas smell
• Sewage backup or drain overflow

Urgent (call same day or next day):

• Blocked toilet (if it’s your only one)
• Dripping tap or small leak that’s getting worse
• Radiators not working

Non-urgent (book a standard appointment):

• Slow-draining sink
• Noisy pipes
• Routine boiler service or maintenance

How to find the stopcock if you’ve never needed it before

If you don’t know where your stopcock is, find it now — don’t wait for an emergency. Common locations:

• Under the kitchen sink
• In the downstairs toilet
• Near the front door in a cupboard or under the stairs
• In the garage or utility room
• Outside in a covered box near the property boundary

Once you’ve found it:

• Make sure it turns (older stopcocks can seize up).
• Label it clearly.
• Show everyone in the house where it is.

Should you try to fix it yourself?

Some things (like topping up boiler pressure or plunging a blocked toilet) are safe to do yourself. But for anything involving pipework, boilers, or gas, call a professional. DIY fixes often make the problem worse and can end up costing more to repair.

What to tell the plumber when you call

To help the plumber assess the situation quickly, have this information ready:

• What’s the problem (e.g., burst pipe, no hot water, leak)?
• Where is it happening (e.g., kitchen, bathroom, boiler)?
• Have you turned off the water/boiler?
• Is the property flooded or at risk of flooding?
• Is there any gas smell? (If yes, call the National Gas Emergency number: 0800 111 999)

See: Emergency Repairs

Final thoughts

Most plumbing emergencies can be contained with a few simple steps: turn off the water, turn off the boiler if needed, and call a plumber. The faster you act, the less damage you’ll have to deal with later.

If you’re in Middlesbrough or Teesside and need urgent help, we’re Gas Safe registered (972035) and available for emergency callouts.

Book emergency repair or call us on 07555363978.