How to Prevent Frozen Pipes in Winter

When temperatures drop during a British winter, frozen pipes become a real concern for homeowners. It’s one of those issues that often goes unnoticed until it turns into something far more serious—like a burst pipe and water damage.

Pipes are especially vulnerable in older properties or areas of the home that don’t get much heat, such as lofts, garages, and external walls. Once water inside a pipe freezes, it expands and puts pressure on the pipe from the inside. It doesn’t take much for that pressure to cause a crack, and when the ice thaws, that’s when the real damage begins.

The good news is that preventing frozen pipes is relatively straightforward if you take a few practical steps before and during cold weather.

Insulate Exposed Pipework

One of the most effective ways to prevent freezing is to insulate any exposed pipes. This is particularly important in unheated spaces like lofts or underfloor voids.

Foam lagging is inexpensive, easy to install, and does a good job of keeping heat in the pipes. It’s worth checking existing insulation too, as older lagging can wear out or become less effective over time. Pay attention to joints and bends, where freezing is more likely to occur.

Keep the Heating Ticking Over

Turning your heating off completely during winter—even when you’re out—can increase the risk of frozen pipes.

Keeping your heating on at a low, steady temperature helps maintain warmth throughout the house and protects vulnerable pipework. This is especially important during overnight freezes or when you’re away for extended periods.

Let Water Move Through the System

Running taps slightly during very cold weather can help reduce the risk of freezing. Even a small trickle keeps water moving, which makes it less likely to freeze solid.

This can be particularly useful for pipes located along external walls or in colder parts of the property.

Protect Outdoor Taps

Outdoor taps are among the first to freeze because they’re fully exposed to the elements.

Before winter sets in, disconnect any garden hoses and drain the tap if possible. If you have an isolation valve inside, turning it off adds another layer of protection. Tap covers are also widely available and can help reduce exposure to freezing air.

Seal Draughts Around Pipe Entry Points

Cold air can easily get in through small gaps where pipes enter your home. These draughts can lower the temperature around pipework enough to cause freezing.

Sealing gaps with expanding foam or sealant helps keep warm air in and cold air out. It’s a quick fix but often overlooked.

Open Cupboards on Cold Nights

Pipes under sinks—especially in kitchens—are often positioned against outside walls, making them more prone to freezing.

Leaving cupboard doors open allows warm air to circulate around the pipes, which can make a noticeable difference during particularly cold nights.

Know Your Stopcock Location

If a pipe does freeze and burst, acting quickly is key to limiting damage.

Make sure you know where your stopcock is and that it’s easy to access. Turning off the water supply quickly can prevent a small issue from becoming a major problem.

Be Careful with Loft Insulation

Loft insulation is important for energy efficiency, but it can sometimes make loft spaces colder by trapping heat below.

If you have pipes in the loft, they need to be insulated properly as well. Otherwise, they’re left exposed to colder air, increasing the risk of freezing.

What If a Pipe Freezes?

If you suspect a pipe has frozen—perhaps a tap has stopped running or water flow is very weak—don’t ignore it.

Turn off the water supply and try to gently warm the pipe using a hairdryer or warm cloths. Avoid using anything like a blowtorch or open flame, as this can cause serious damage.

If you’re unsure, it’s always safer to call in a professional rather than risk making things worse.

A Little Preparation Goes a Long Way

Frozen pipes are one of the most common winter plumbing issues in the UK, but they’re also one of the most preventable.

Taking a bit of time to insulate pipes, manage indoor temperatures, and prepare your home before a cold snap can save you from costly repairs and disruption later on.

When it comes to plumbing, small preventative steps are often the difference between a smooth winter and a stressful one. Keeping an eye on your system—and acting early—can help ensure your home stays warm, dry, and problem-free throughout the colder months. Contact us today for Expert Plumbing Services in London.