Frozen Pipes: A Winter Checklist for Essex Homes

Why pipes freeze — and which ones go first

Water expands by roughly a tenth of its volume as it turns to ice. Trapped inside a sealed pipe, that expansion has nowhere to go, so pressure builds until the weakest point — a joint, a soldered seam, an older worn section — gives way. The cruel part is that the split often doesn't show until the thaw, when the ice melts and water pours out of the crack.

The pipes that freeze first are the ones running through unheated, exposed spaces. In Brentwood's 1930s semis — and across the older properties in Warley, Hutton and Ingatestone — the usual suspects are the same year after year:

Loft pipework and the cold-water tank. Modern insulation keeps heat in the rooms below, which means the loft itself stays bitterly cold — and the tank and its feed pipes sit right in it.
Garage and outbuilding runs. An unheated garage with a supply for an outside tap or a utility sink is one of the most common freeze points we're called to.
Outside taps. The pipe behind the tap passes through the external wall and is fully exposed to the weather.
Exposed runs on north-facing walls. Pipes clipped to an outside wall, run under a suspended ground floor, or feeding a boiler condensate outlet all chill quickly in a still, cold snap.

If your home was built before central heating was the norm — common right across CM13, CM14 and CM15 — pipework was often added later and routed wherever was easiest, not warmest. That history is exactly why a December check pays off.

Prevention checklist

Stopping a pipe freezing is far easier — and far cheaper — than dealing with a burst. Work through this before the first hard frost:

Lag your pipes and tanks. Slip foam pipe insulation over every exposed run in the loft, garage and under the floor, and fit an insulating jacket to the cold-water tank. Don't forget the underside of the tank — rising warmth from below helps keep it from freezing.
Keep the heating ticking over in a cold snap. In a prolonged freeze, leave the heating on low — around 12 to 15°C — rather than switching it off completely. A little background warmth keeps the worst of the chill off the pipework.
Fix dripping outside taps before winter. A tap that weeps will freeze solid, and the ice tracks back into the pipe behind the wall. Repair the drip and, if there's an isolating valve indoors, turn it off and drain the tap for the season.
Know where your stopcock is. If a pipe does burst, the speed you can reach the stopcock decides how much damage you end up with. If you're not sure, our guide on how to find your stopcock walks you through it.
Open the loft hatch on the coldest nights. Letting a little household warmth drift up into the loft can be enough to keep the tank and feed pipes above freezing.
Drain down if the house will be empty. Leaving for Christmas or a winter break? Either keep the heating on a frost-protection setting, or turn the water off at the stopcock and drain the system so there's nothing in the pipes to freeze.

How to thaw a frozen pipe safely

Found a pipe that's frozen but hasn't split — no water from a tap, but no leak either? You can often thaw it yourself. The golden rules are: turn the water off first, work gently, and never use a naked flame. Heating a frozen pipe too fast, or with a blowtorch, can crack it or set light to nearby joists and insulation.

Turn off the stopcock

Shut the water off at the main stopcock before you start. If the frozen section has already split, this stops it flooding the moment the ice melts.

Open the nearest tap

Open the tap fed by the frozen pipe. This gives the melting water somewhere to go and relieves pressure in the pipe as the ice releases.

Apply gentle heat

Start at the tap end and work back along the pipe. Use a hot-water bottle, warm towels, or a hairdryer on a low setting. Warm it slowly — never a blowtorch, heat gun or any naked flame.

Check as it flows

Once water trickles from the open tap, the ice is clearing. Keep checking the thawed section for leaks before you turn the stopcock back on, in case the freeze has already done damage.

If you can't reach the frozen section, it's buried in a wall or floor, or you're not confident, leave it and call us. Forcing it is how a frozen pipe becomes a burst one.

If a frozen pipe has already burst

A burst pipe is a genuine emergency — water can do an astonishing amount of damage in minutes. If you spot water pouring or spraying from a pipe, or the ceiling starts bulging and dripping after a thaw, act fast:

Stop the water. Turn off the main stopcock immediately. Then open all the cold taps to drain the system down and take the pressure off the burst.
Switch off the heating and the electrics if needed. Turn off the boiler or central heating. If water is anywhere near light fittings, sockets or the consumer unit, switch off the electricity at the mains and keep clear.
Contain what you can. Buckets under the leak, towels down, and move anything valuable out of the way.
Call us. We're available 24/7 and Gas Safe registered, with no call-out fee in our coverage area. The sooner we're on the way, the sooner the water's stopped for good and the repair's underway.

If you can't find where the water's coming from — a damp patch spreading with no obvious source — that's where our leak detection service traces it without tearing the place apart. And for any out-of-hours burst, our emergency plumber in Brentwood is on call around the clock.

Your December “before the freeze” checklist

Give yourself half an hour on a mild December day and run through this. It's far better to find a problem now than at 6am on the first frosty morning of the year.

Check loft, garage and under-floor pipes are lagged, and top up any insulation that's slipped.
Make sure the cold-water tank has a jacket.
Repair any dripping outside tap and isolate it for the winter.
Find your stopcock, check it turns freely, and make sure everyone in the house knows where it is.
Set the heating to hold a low background temperature, or a frost setting, during cold snaps.
Plan a drain-down if the house will be empty over the holidays.
Save our number — 01277 676065 — in your phone now, so it's there if you need it.

Frozen pipes FAQ

Quick answers.

At what temperature do pipes start to freeze?

Water freezes at 0°C, but exposed pipes are most at risk once the outside temperature stays below freezing for several hours — typically overnight in a still, hard frost. Pipes in unheated lofts and garages can freeze even when the rest of the house feels warm.

Should I leave the heating on when I'm away in winter?

In a cold snap, yes — leaving the heating on a low or frost-protection setting (around 12 to 15°C) is the simplest way to keep pipes from freezing. If you'd rather not, turn the water off at the stopcock and drain the system instead so there's nothing in the pipes to freeze.

Can I use a blowtorch to thaw a frozen pipe?

No — never use a naked flame, blowtorch or heat gun. Rapid, intense heat can crack the pipe and easily set fire to nearby timber and insulation. Use gentle heat only: a hot-water bottle, warm towels or a hairdryer on low, working from the tap end back.

My pipe froze but I can't see a leak — is it safe?

Maybe, but a split can stay hidden until the ice melts and water escapes. Turn off the stopcock before thawing, open the nearest tap, and watch the section closely as it clears. If you spot any damage, leave the stopcock off and call us.

Do you charge a call-out fee for a burst pipe?

No call-out fee inside our coverage area, and we're available 24/7. A burst pipe won't wait for office hours, and neither do we — call 01277 676065 any time.

Burst pipe? Don't wait.

Stop the water, then call us.

Frozen, split or flooding — we're Gas Safe registered, on call 24/7, and there's no call-out fee in our coverage area across the CM postcodes. Tell us what's happening and we'll get someone moving.

Call 01277 676065