Quick answer
Turn off the water at the stopcock if a pipe has split, and keep clear of any water near electrics. Do not use a blowtorch or open flame to thaw a pipe. A frozen pipe can leak when it warms, so inspect safely and get damaged pipework repaired.
If water is already leaking
A frozen pipe may crack while frozen and only begin leaking as ice melts. If you see water, isolate the supply at the internal stopcock if it is safe to do so. Open cold taps to relieve pressure and drain accessible pipework, but do not force a stiff stopcock.
Keep away from water near sockets, lights, boilers or appliances. Turn off electricity at the consumer unit only if you can do so from a dry, safe position. If the leak is in a ceiling void or behind a wall, watch for damp patches and avoid opening the structure yourself.
Thaw a frozen pipe carefully
- 1Turn off the water supply before thawing if you suspect a split or cannot monitor the pipe safely.
- 2Warm the room gradually and open cupboard doors to let warmer air reach exposed pipes.
- 3If a pipe is accessible and intact, apply gentle warmth with a warm cloth or hot-water bottle, starting near the tap end and working back towards the frozen section.
- 4Keep taps open so melting water can escape. Check the pipe carefully as it thaws and stop if you notice a leak.
- 5Never use a blowtorch, naked flame, boiling water or a high-powered heat gun. Do not thaw pipework that is inaccessible or close to electrical equipment yourself.
Check, repair and reduce repeat risk
Once water is restored, check accessible pipework and ceilings for leaks, but do not assume hidden sections are sound. A plumber can assess split sections, joints and insulation and confirm whether the system is safe to use. TraceFix engineers in Birmingham and London can help with emergency pipe repairs and leak investigation.
After the immediate repair, reduce exposure to cold by insulating accessible pipes and keeping vulnerable rooms reasonably warm during cold spells. Know where the stopcock is and check that it operates before an emergency. Do not block ventilation or use unsafe heaters to protect pipework.
When to call a plumber
- A pipe has split, or you cannot find the frozen section.
- Water is leaking near electrical fittings or into a ceiling.
- The stopcock is seized or the leak continues after isolation.
- A pipe is concealed, difficult to access or part of a heating system.