Finding a water leak at home is stressful. Water’s going everywhere, you’re not sure where it’s coming from, and you’re worried about damage to floors, walls, and electrics. The good news is that if you act quickly and methodically, you can limit the damage and make the repair easier when the plumber arrives.
This guide walks you through exactly what to do in the first few minutes after discovering a leak, how to identify the source, and what to prepare while you wait for help.
Immediate steps (first 5 minutes)
Time matters when there’s water escaping. These are the actions to take right now, before you do anything else.
Turn off the water
Your stopcock controls the water supply to your home. It’s usually under the kitchen sink, but in older properties it might be in a cupboard, under the stairs, or near the front door. Turn it clockwise until it won’t turn any further. This stops mains water flowing into the property.
Once it’s off, open a cold tap to drain any water left in the pipes. This reduces pressure and can slow or stop the leak if it’s on the mains supply.
If you can’t find your stopcock, or it’s seized and won’t turn, focus on containment and call a plumber immediately. Many older Teesside properties have stopcocks that haven’t been touched in years and can be difficult to operate.
Turn off the heating
If the leak is coming from a radiator, pipe, or boiler, turn off your central heating at the programmer or thermostat. This stops the pump circulating hot water around the system and can reduce the flow significantly.
You should also switch off the boiler itself if you can do so safely. For leaks from heating pipes or radiators, this is often more effective than turning off the mains water, because the heating system is a closed loop.
Switch off electrics
Water and electricity are a dangerous combination. If the leak is near sockets, light fittings, a fuse box, or any electrical appliance, go to your consumer unit (fuse box) and switch off the circuit for that area. If you’re not sure which circuit it is, switch off the main supply.
Don’t touch anything electrical in a room with standing water. Don’t use appliances, don’t plug anything in, and don’t switch lights on or off until the area is dry and safe.
Contain the water
Put buckets, bowls, or containers under the leak. Use towels, old sheets, or a mop to soak up standing water and stop it spreading into other rooms. If water is pooling on a floor, direct it away from walls and furniture where it can cause more damage.
If the leak is coming through a ceiling, it means water is pooling above. Make a small hole in the ceiling at the lowest point to release the water in a controlled way, rather than letting it spread and potentially collapse the ceiling. Use a bucket to catch it.
Identify the source
Knowing what kind of leak you’re dealing with helps you explain it to the plumber and gives you a better idea of urgency. Here’s how to tell the difference.
Mains water pipe
This is a leak from your cold water supply. The water flows constantly, doesn’t stop when you turn the heating off, and is cold. If you’ve turned off the stopcock and the leak has stopped or slowed significantly, it’s a mains leak.
Common locations: under sinks, where pipes enter the property, pipe joints in walls or under floors. Older Teesside properties with original pipework are more prone to these, particularly after cold winters when pipes may have frozen and cracked.
Heating system
If the leak stops or slows when you turn off the heating, it’s likely a heating pipe, radiator valve, or boiler. The water may be warm or discoloured (brownish from rust in the system).
Common locations: radiator valves, pipe joints near the boiler, towel rails, pump connections.
Waste pipe
This only leaks when water is draining — when you run a tap, flush the toilet, empty the bath. If the leak appears during or just after using water, it’s a waste pipe issue.
Common locations: under sinks, behind toilets, shower trays, washing machine waste pipes.
Appliance
Check if the leak is coming from a washing machine, dishwasher, toilet cistern, or immersion heater. Appliance leaks are often at hose connections or inlet valves.
If you can isolate the appliance (turn off its water supply valve or unplug it), do so and see if the leak stops.
What to do while you wait
Once you’ve stopped the water and contained the immediate problem, there are a few things you can do to prepare for the repair and protect yourself if you need to make an insurance claim.
Document the damage
Take photos or video of the leak, the source (if you’ve found it), and any water damage to floors, walls, ceilings, or belongings. Note the time you discovered it and what you did to stop it.
This is useful for insurance claims and helps the plumber understand the situation before they arrive.
Note the details
Write down where the leak is, how fast it’s flowing, what colour the water is, and whether it’s hot or cold. If you’ve turned off the stopcock or heating and the leak has changed, make a note of that too.
The more information you can give the plumber when you call, the better they can prepare and the faster they can fix it.
Move valuables and furniture
Get anything valuable, electronic, or difficult to dry out away from the affected area. Lift furniture onto blocks if you can’t move it entirely. Roll up rugs and carpets if they’re getting wet.
If there’s a lot of water, open windows to help air circulate and reduce humidity. This can prevent secondary issues like mould.
Check for ceiling leaks
If water is coming through a ceiling, it means there’s a problem in the room above — a pipe, radiator, toilet, or appliance. The water is pooling between the ceiling joists and will eventually come through.
This can be dangerous if the ceiling plaster becomes saturated and heavy. If you see a bulge or sagging, stay out of the room and call for emergency help. Make a small hole at the lowest point to relieve the pressure if it’s safe to do so.
What NOT to do
There are a few common mistakes people make when they find a leak. Avoid these.
Don’t rely on temporary fixes
Plumber’s tape, sealant, or a jubilee clip might slow a leak temporarily, but it’s not a proper repair. It’s fine to use these to contain the situation while you wait, but don’t turn the water back on and assume the problem is fixed. Leaks get worse, and a bodged repair can fail suddenly and cause more damage.
Don’t ignore small leaks
A slow drip doesn’t seem urgent, but it can waste hundreds of litres over time, cause damp and rot, and indicate a bigger problem developing. If you’ve found a leak, get it looked at properly even if it seems minor.
Don’t turn the water back on too soon
Once you’ve stopped a leak by turning off the stopcock, leave it off until a plumber has inspected and repaired the problem. Turning it back on to “see if it’s still leaking” can flood the property quickly if the leak hasn’t been fixed.
Don’t use electrics near water
Don’t use electrical appliances, phone chargers, or extension leads in areas with standing water. Don’t touch light switches or sockets. Water conducts electricity and the risk of shock is real.
When it’s an emergency vs when it can wait
Not all leaks need an emergency callout, but some do. Here’s how to tell the difference.
Emergency (call now)
- Burst pipe with water pouring out
- Leak you can’t stop or slow down
- Water near electrics or flooding through a ceiling
- Boiler leaking or making loud noises
- Water spreading into multiple rooms
These need same-day or out-of-hours attention. See: Emergency Repairs.
Urgent but not emergency (same day)
- Slow leak from a pipe joint or radiator valve
- Dripping tap that won’t stop even when turned off
- Visible damp patch that’s growing
- Water pooling under an appliance
These should be dealt with quickly, but you can usually wait a few hours for a plumber during normal working hours. See: Leak Repairs.
Can wait (book an appointment)
- Very slow drip that’s been contained
- Stain appearing on a ceiling but no active drip
- Damp patch that’s stable and not spreading
- Radiator valve that weeps slightly when heating is on
These are still problems that need fixing, but they’re not going to cause immediate damage. Book a convenient appointment and monitor the situation in the meantime. See: Plumbing.
If you’re unsure, call and describe what you’re seeing. A good plumber will tell you honestly whether it’s urgent or can wait.
Insurance
If the leak has caused damage to your property or belongings, contact your home insurance provider as soon as you’ve contained the situation. Most policies cover water damage, but you’ll need to demonstrate that you acted quickly to minimise the damage.
Keep receipts for any emergency plumber callouts, drying equipment hire, or repairs. Take photos before, during, and after the work. Insurers will usually cover the cost of accessing and repairing the leak, as well as making good any damage to floors, walls, or ceilings.
Some insurers have their own approved contractors, but you’re usually free to use your own plumber as long as the work is done to a reasonable standard and you provide receipts.
Final thoughts
Finding a leak is unsettling, but if you act quickly and methodically, you can prevent serious damage and make the repair straightforward. Turn off the water, contain the situation, and document what’s happening. Most leaks can be fixed quickly once a plumber arrives, and knowing what you’re dealing with makes the whole process smoother.
If you’ve got a leak and need help, get in touch. We cover Middlesbrough, Stockton, Redcar, and the surrounding area, and we’re available for emergency callouts when you need us.