Frozen Pipes: What to Do Before the Plumber Arrives
When temperatures in {location} drop below freezing, water pipes — particularly those in unheated areas — can freeze solid. If you act quickly, you can often thaw them safely and prevent a burst. Here's what every homeowner needs to know.
How to Tell If Your Pipes Are Frozen
- No water comes out when you turn on a tap, or only a trickle appears
- Your central heating stops working or radiators stay cold
- You can see frost or ice on exposed pipes in the loft, garage, or under the kitchen sink
- There's a strange gurgling or banging noise from the plumbing
Which Pipes Freeze First?
The most vulnerable pipes in UK homes are:
- Loft pipes — especially the cold water tank feed and overflow
- Pipes in unheated garages or outbuildings
- External pipes and outside taps
- Condensate pipes on condensing boilers (the small plastic pipe that exits through an outside wall)
- Pipes running along external walls with poor insulation
How to Thaw Frozen Pipes Safely
If you suspect a frozen pipe, follow these steps:
- Turn off the stopcock — if the pipe has already cracked, this limits the flooding when it thaws
- Open the nearest tap to the frozen section so melting water can escape
- Apply gentle heat — use a hairdryer, hot water bottle, or towels soaked in warm water wrapped around the pipe
- Work from the tap backwards towards the frozen section so water can flow out as it melts
- Never use a blowtorch or naked flame — this can cause steam explosions or fire, particularly near timber joists
When to Call an Emergency Plumber
You should call a qualified plumber in {location} immediately if:
- You can see a crack or split in the pipe
- Water is already leaking as the pipe thaws
- You can't locate the frozen section
- The frozen pipe is in an inaccessible location
- Your boiler condensate pipe keeps refreezing
Preventing Frozen Pipes
Prevention is always cheaper than repairs. Before cold weather hits {location}:
- Lag all exposed pipes in the loft, garage, and external walls with foam pipe insulation (available from any DIY store for under £10)
- Keep your heating on a low setting (at least 12°C) even when you're away
- Insulate your loft hatch and ensure the cold water tank has a jacket
- Fix dripping taps — even a slow drip can freeze and block a pipe
- If you're going on holiday in winter, consider draining the system or ask a neighbour to check daily
A burst pipe can cause tens of thousands of pounds in damage. A few pounds spent on insulation and a little preparation can prevent the whole ordeal.