What to Do When a Water Pipe Bursts at Home

First five minutes: stop the water

Find your internal stop tap and turn it clockwise until it will not move any further. In most Derby homes it is under the kitchen sink, though in older terraces around areas like Normanton or Chaddesden it can be in a downstairs toilet, under the stairs or beneath a floorboard near the front door. If it is seized or missing, use the outside stop valve at the boundary of your property, which usually needs a stop tap key.

Once the mains is off, open the cold taps at your kitchen sink and bath to drain the system quickly. This empties the pipework and takes the pressure off the burst, which slows the flow of water into your walls and floors far sooner than waiting for it to stop on its own.

• Turn off the internal stop tap fully, then open cold taps to drain down
• Switch off your boiler or immersion heater so it does not run dry
• If water is near sockets, light fittings or the consumer unit, turn the electricity off at the fuse board before touching anything
• Turn off the central heating and, if the leak is on a heating pipe, close the valves either side of the radiator if you can reach them

Limit the damage while the water drains

Move furniture, rugs and electricals out of the wet area, and put buckets or towels under any active drips. If a ceiling is bulging with trapped water, place a bucket underneath and pierce the bulge with a screwdriver to let it drain in a controlled way. It feels wrong, but a small hole you make is far cheaper to repair than a ceiling that collapses under the weight.

Take photographs and short videos of everything before you clean up, including the burst itself if it is visible. Most home insurance policies cover escape of water, and clear evidence of the damage as it happened makes the claim much smoother. Note the time you found the leak and when you shut the water off.

Frozen pipes, old fittings and other common causes

In winter, bursts often follow a freeze. Water expands by around nine per cent as it turns to ice, splitting copper and plastic pipe alike, and the burst usually only shows itself during the thaw. Pipes in lofts, garages and under suspended floors are the usual suspects, so if one has gone in a cold snap it is worth checking others before turning the mains back on.

The other frequent culprits are corroded compression fittings, nail strikes from old DIY work that finally give way, and high mains pressure. Parts of Derbyshire receive mains pressure well above the 1 to 2 bar most fittings are happiest with, and years of that strain will find any weak joint eventually.

When the burst is hidden: how leak detection works

Not every burst announces itself with a fountain. A pipe that has split under a concrete floor or inside a wall may only show as a damp patch, a warm spot on the floor, a hissing sound at night or a water meter that keeps turning with every tap off. Ripping up floors to search for it is expensive and often unnecessary.

Specialists use acoustic listening equipment, thermal imaging and tracer gas to pinpoint a hidden leak, typically to within a few centimetres, so only one small area needs opening up. A detection survey on a domestic property usually takes two to four hours. The cost depends on the size of the property and how accessible the pipework is, so ask for a clear price before booking, and check whether the report you receive is suitable for supporting an insurance claim, as insurers often ask for one.

Getting dry and getting repaired

Once the pipe is fixed, the drying matters as much as the repair. Solid walls and concrete floors can hold moisture for weeks, and redecorating too soon traps it in, leading to mould and lifted flooring later. Ventilate well, and for anything beyond surface wetness ask your insurer about professional drying equipment.

Finally, reduce the risk of a repeat. Lag any exposed pipes in the loft and garage, fix dripping taps before winter, learn where your stop tap is and test it twice a year so it does not seize, and consider a leak detection shut off device if you travel often. Every adult in the house should know how to turn the water off, because the person who finds the leak is rarely the one who knows where the tap is.