What to Do If Pipes Burst

A burst pipe can flood your home in minutes. Whether you’re in a Victorian terrace in Hackney or a converted flat in Wandsworth, water damage spreads fast—and the bill rises even faster. The good news? You can limit the chaos if you know what to do straight away. This guide walks you through the immediate steps to take when pipes burst, explains why it happens, and shows you how to prevent it from happening again. Let’s get your home sorted.

What to do if pipes burst — step-by-step

1. Turn off the mains water supply. Find your stop tap (usually under the kitchen sink or where the water pipe enters your home) and turn it clockwise until it stops. This cuts off the water feeding the burst pipe.
2. Switch off electrics in affected areas. If water is pooling near sockets, switches, or appliances, turn off the electricity at your consumer unit. Water and electrics don’t mix—safety first.
3. Drain the system. Open all your cold taps to drain remaining water from the pipes. Flush toilets too. This releases pressure and reduces further flooding.
4. Contain the water. Grab towels, buckets, and anything absorbent. Move furniture, rugs, and belongings away from the water. The quicker you act, the less damage you’ll face.
5. Call a professional plumber. Don’t attempt a DIY fix if you’re not qualified. A plumber will assess the damage, repair the pipe properly, and check for further weak points. 

What causes burst pipes?

1. Freezing temperatures. Water expands when it freezes. That expansion creates pressure inside the pipe, leading to cracks or complete ruptures.
2. Ageing pipework. Older London homes often have original iron or lead pipes that weaken over time. Corrosion and wear make them fragile.
3. High water pressure. Sudden pressure changes or consistently high pressure can stress pipes, especially at joints and bends.
4. Corrosion and limescale. London’s hard water builds up inside pipes, narrowing the passage and weakening the material. Poor repairs from previous work can also leave vulnerable spots.

Why do pipes burst in the winter?

Cold weather is the main culprit. When temperatures drop below freezing, standing water inside pipes turns to ice. Ice takes up more space than liquid water, creating pressure that the pipe can’t handle. Eventually, it cracks or bursts.

Exposed pipes are most at risk—think lofts, basements, garages, and outdoor taps. If these areas aren’t heated or insulated, your pipes are sitting ducks when the mercury drops.

Want to prepare your heating system before winter hits? Check out Qeeper’s heating and gas services for seasonal checks.

Can pipes burst in the summer?

Yes, they can. Heat dries out older pipes, making them brittle. Rubber washers and seals can perish faster in warm conditions too.

Summer also brings higher water usage—more showers, garden hoses, washing machines running. That increased demand puts extra pressure on ageing systems.

Extreme heat can even shift the ground around exterior pipes, causing movement and stress on connections. It’s less common than winter bursts, but it happens.

Can pipes burst if the water is shut off?

Rare, but possible. If a pipe was already damaged or frozen before you turned off the water, it might still burst. The ice inside doesn’t disappear instantly when you shut the mains off.

Residual water trapped in the system can also expand or leak through weakened joints. Shutting off the water stops new water entering, but it doesn’t fix existing damage.

Can pipes burst without water?

Unlikely. A pipe needs water inside it to freeze, expand, and burst. However, empty pipes can crack if they’re exposed to extreme temperature swings—going from very hot to very cold repeatedly.

The real problem shows up when you turn the water back on. A cracked empty pipe becomes a flooded room the moment water flows through it again.

How long does a burst water pipe take to fix?

• Simple repairs: 1–2 hours. If the pipe is accessible and the damage is straightforward, a plumber can patch or replace the section quickly.
• Complex repairs: Several hours to a full day. Pipes hidden behind walls, under floors, or in tight spaces take longer. Your plumber may need to remove tiles, floorboards, or plaster to reach the problem.
• Drying and follow-up work: Days or weeks. Once the pipe is fixed, you’ll need to dry out affected areas. Plastering, redecorating, or replacing flooring depends on how much water damage occurred.

Burst pipe — who to call?

• A qualified plumber. Your first call. They’ll stop the leak, repair the damage, and test the system.
• A heating engineer. If the burst pipe is part of your central heating or connected to your boiler, you need a Gas Safe registered engineer. They’ll check the heating circuit and bleed radiators if needed.
• Your water supplier. If the leak is outside your property boundary—on the pavement or in the street—it’s Thames Water’s responsibility (or your local supplier). Report it to them.

Burst pipes repair: what plumbers will check

1. When a plumber arrives, they won’t just patch the leak and leave. Here’s what they’ll inspect:
2. The damaged pipe and surrounding fittings. They’ll assess how bad the burst is and whether nearby pipes are at risk.
3. Insulation, joints, and connectors. Weak points often appear in clusters. If one pipe burst, others might be close behind.
4. Signs of further leaks. Damp patches, water stains, or rust indicate hidden problems elsewhere in the system.
5. Water pressure and system function. After repairs, they’ll test the pressure to confirm everything works properly and won’t burst again.

How to prevent burst pipes

Insulate exposed pipework

• Wrap pipes in lofts, basements, garages, and near outdoor taps with foam insulation. It’s cheap, easy to fit, and stops pipes freezing.
• Focus on unheated areas where temperatures drop below freezing. Even a thin layer of insulation makes a difference.

Keep heating consistent in colder months

• Don’t turn the heating off completely when you’re away. Set it to a low temperature (around 12–15°C) to keep pipes warm enough to avoid freezing.
• If you’re going on holiday in winter, ask a neighbour to check on your home or install a smart thermostat you can control remotely.

Fix small leaks early

• A dripping tap or damp patch might seem minor, but it’s a sign of wear. Small leaks turn into big problems if left ignored. Sort them before they escalate.

Add stop-tap testing to seasonal checks

• Your stop tap needs to move freely in an emergency. Test it twice a year—turn it clockwise to close, then back again. If it’s stiff, apply some WD-40 or call a plumber to replace it.
• Planning ahead for winter? Qeeper’s heating and gas services can inspect your system and insulate vulnerable pipes.

Seasonal risk checklist for London homes

Conclusion

When pipes burst, every minute counts. Turn off the water, cut the power if needed, and call a professional plumber straight away. The faster you act, the less damage you’ll face. Prevention is simpler than repair—insulate exposed pipes, keep heating on low in winter, and fix small leaks before they turn serious. If you’re in London and need help with a burst pipe or want to prepare your home for the colder months, reach out to Qeeper’s local plumbing team. We’ll get your pipes sorted quickly and properly.