Emergency Steps for a Leaking Pipe at Home

First, Shut Off the Water

A leaking pipe is one of those moments where a few seconds of clear thinking saves thousands of pounds in damage. Before you reach for towels, reach for the stopcock. Everything else can wait.

Start with the internal stopcock. In most UK homes it sits under the kitchen sink, though you will also find one in an airing cupboard, under the stairs or beside the gas meter in older properties. Turn it clockwise until it stops — it may feel stiff if it has not been moved in years, so use a cloth around the handle for grip rather than forcing it with bare hands.

If that valve is seized or you cannot find it, head outside. Your external stopcock lives under a small metal or plastic cover near your property boundary, sometimes shared with a neighbour in older terraces. You will need a stopcock key (often called a Toby key) to reach it. If the cover is under a car or buried under paving, call your water supplier — they can isolate it from the mains and will usually do so quickly in an emergency.

• Turn off the cold mains first, then open the cold taps to confirm the flow has stopped.
• If you have a combi boiler, the hot supply will run dry once the mains is off.
• For gravity systems, isolate the cold feed to the cylinder or the gate valve in the loft, then drain the hot taps too.

Drain the System and Protect Your Home

Stopping the supply is only half the job — there is still water sitting in the pipework and the tank. Open every cold tap in the house, starting with the lowest (usually the kitchen), then work upwards. Flush the toilets once. This drains the system and reduces the pressure on your temporary repair.

Now think about safety before salvage. If water is anywhere near sockets, light fittings or a consumer unit, switch off the electricity at the fuse board — but only if you can reach it without standing in water. If you cannot, leave it and call an electrician as well as a plumber.

Contain the damage with whatever you have: buckets, washing-up bowls, towels, bin bags split open. Move furniture, rugs and anything electrical clear of the wet zone. If water is pooling on a ceiling, place a bucket underneath and pierce a small hole in the bulge with a screwdriver to release it in a controlled way — a bulging ceiling is far better drained than collapsed.

Making a Temporary Repair

You do not need a plumber's toolkit to slow a leak dramatically. The trick is to work on a dry-ish surface and to wrap tightly.

• Self-amalgamating silicone tape is the single most useful item in an emergency. Stretch it as you wrap — roughly double its length — and overlap each turn by half. It fuses into a solid rubber sleeve in minutes and works on copper, plastic and even slightly damp pipework.
• Rubber and a jubilee clip handles larger splits. Cut a strip from an old inner tube or a bicycle repair patch, wrap it over the leak and tighten a clip over the top. Two clips side by side work better than one on a long split.
• Plumber's epoxy putty is excellent for pinholes in copper, but only on a dry surface. Knead it, press it firmly over the hole and leave it to cure for the time stated on the pack.
• Push-fit repair couplings suit plastic pipe. Cut out the damaged section with a hacksaw, deburr the ends and push the coupling on. Make sure the pipe is fully inserted to the marked depth.

Avoid duct tape on its own — it softens with heat and fails under pressure. Never apply a naked flame or heat gun near plastic pipework, and do not over-tighten old brass fittings; cracked nuts turn a drip into a flood.

When to Stop and Call a Professional

Some jobs are beyond a temporary fix, and knowing when to stop is a skill in itself. Call a plumber immediately if the leak is on a gas pipe, if water is running through a ceiling or light fitting, if the pipe is behind a solid wall or under a concrete floor screed, or if you cannot isolate the supply at all. If the leak is on the main rising supply before the stopcock, your water supplier is responsible and will attend as an emergency.

While you wait, take photographs and note the time. Your insurer will want evidence, and a clear record makes the claim far simpler.

Drying Out Properly to Prevent Damp

This is the stage most people rush, and it is where long-term damp problems begin. Water that soaks into plaster, screed or timber does not simply evaporate once the surface feels dry. Open windows and doors when you can, run a dehumidifier continuously for several days, and keep central heating on low rather than blasting it, which can cause timber to split as it dries too quickly.

Watch for tide marks, bubbling paint and a musty smell over the following weeks. These are signs that moisture is trapped in the wall, and a slow leak behind plaster is a classic cause of rising damp symptoms that are nothing to do with groundwater. If you spot them, do not paint over the area — it needs to dry fully and may need the plaster removed and reinstated with a suitable renovating render before any decoration.

Preventing the Next Emergency

Spend ten minutes now and you will thank yourself later. Find your stopcock, label it, and exercise it twice a year so it does not seize. Keep a small emergency kit in a cupboard: self-amalgamating tape, two jubilee clips, a stopcock key and a torch. Insulate pipes in lofts, garages and anywhere draughts reach, and fix dripping joints before winter, because a drip under pressure in a cold snap becomes a split.

Above all, know where your water comes in and how to stop it. That single piece of knowledge turns a potential disaster into a manageable inconvenience.