Devon has a mild reputation — the climate that earns comparisons to the Mediterranean. But the county is also home to Dartmoor, one of the highest and most exposed areas of southern England, where temperatures regularly drop well below freezing in winter. Properties on the Dartmoor fringe — Tavistock, Okehampton, Princetown, Chagford, Moretonhampstead — face frozen pipe risks that milder coastal Devon does not.
Rural properties with exposed external pipework, unheated outbuildings, older insulation standards, and ground-floor timber construction are at particular risk. This guide covers prevention, what to do when pipes freeze, and how to manage a burst pipe.
Why Devon Properties Are at Higher Risk Than You Might Expect
The average winter temperature in Tavistock is around 4°C. But averages conceal the extremes. Dartmoor produces persistent radiation frosts — clear, windless nights that draw heat from the ground and exposed pipes while coastal Devon stays above zero. Princetown, at 400 metres, regularly records the coldest overnight temperatures in southern England during cold spells.
- Devon housing also includes a large stock of pre-1970 properties with:
- Uninsulated loft spaces where cold water tanks sit
- Single-skin external walls through which supply pipes are sometimes routed
- Unheated utility rooms, outbuildings, and cellars with water supply connections
- Older plastic or lead pipework with less flexibility than modern materials
How to Prevent Frozen Pipes in Devon
Insulate external and exposed pipework. Foam lagging is cheap and available from builders' merchants. Any pipe running through an unheated space — loft, garage, cellar, outhouse — should be lagged. External stop taps are particularly vulnerable.
Insulate the cold water tank in the loft. If your property has a traditional header tank in the loft, insulate the sides and top. Do not insulate beneath it — you want heat from below to reach the tank, not be blocked out.
Leave the heating on a low setting during cold periods. When the property is unoccupied during a cold snap, set the thermostat to 12–15°C. This is cheap compared to the cost of a burst pipe.
Know where your stopcock is. The stopcock turns off the water supply to the property. Knowing where it is — and being able to turn it off within 30 seconds of discovering a burst — limits flood damage significantly.
Drip a tap in prolonged cold spells. Leaving a cold water tap slightly open during periods of sustained below-zero temperatures keeps water moving, making it harder to freeze. Most useful in exposed properties on Dartmoor.
Lag external taps. External taps on Devon properties are commonly installed for garden use and frequently unlagged. Cover with a foam tap insulator or isolate them from inside for the winter season — turn off the isolation valve and open the external tap to drain the exposed section.
What to Do When Pipes Are Frozen
Do not panic. A frozen pipe has not yet burst. If you can thaw it gently before the pressure of the expanding ice cracks the pipe, no damage is done.
Locate the frozen section. Start at the stopcock and trace the pipework through unheated areas. The frozen section is typically the first cold section of pipe found, often in the loft, an external wall, or a utility room.
- Thaw gently. The correct method is a warm — not hot — heat source applied gradually:
- A hairdryer on a low heat setting, moved along the pipe
- Warm (not boiling) wet cloths wrapped around the pipe
- A hot water bottle held against the frozen section
Never use a blowtorch or heat gun on a frozen pipe. The rapid expansion can crack solder joints and fittings.
Work from the tap end. Start thawing from the tap or outlet end, not the stopcock end. This allows water to escape as it melts and prevents pressure building behind the frozen section.
Leave the tap open. Leave the affected tap open while thawing — the first sign of success is water flowing.
What to Do If a Pipe Has Burst
A burst pipe means the pipe has already cracked and will flood as soon as it thaws.
- Turn off the water at the stopcock immediately.
- Turn off the boiler and central heating.
- Open all cold taps to drain the system — this limits the volume of water that can escape from the burst.
- Turn off electricity at the consumer unit if water is near electrical fittings or coming through ceilings near light fittings.
- Call an emergency plumber — available across Tavistock, Okehampton, and the wider Devon area.
- Photograph and document the damage for your home insurance claim.
The Most Common Burst Pipe Locations in Devon Rural Properties
- Loft pipework to cold water tank — exposed to outdoor temperatures when roof insulation is inadequate
- External tap supply pipes — unlagged isolation runs on north- or east-facing walls
- Pipework in unheated agricultural outbuildings — barns and garages converted to residential use
- Condensate pipes on boilers — the condensate pipe freezes and blocks in cold spells, triggering a boiler fault code rather than a burst, but the blockage is an emergency in its own right in winter
Frequently Asked Questions
How do I know if a pipe is frozen or broken? A frozen pipe: no water from the tap, but no visible water damage. A burst pipe: no water from the tap plus water appearing elsewhere — dripping from a ceiling, damp wall, puddle forming. If unsure, turn off the water at the stopcock while you investigate.
What causes pipes to burst when they freeze? Water expands as it freezes. In a confined pipe, the expanding ice increases pressure until the pipe splits. The burst point is often at a fitting or joint where the wall is thinnest — not necessarily where the frozen section is.
How much does an emergency frozen pipe callout cost in Devon? Typically £120–£250 for the callout and first repair, plus parts. Properties requiring excavation to access a buried burst will cost more. See our emergency plumber page for guidance.
Can I claim frozen pipe damage on home insurance? Most standard home insurance policies cover escape of water — including from a burst pipe. They typically require you to have taken reasonable precautions (such as maintaining heat in the property). Claims for properties left unheated for extended periods may be challenged.
For emergency response to a burst pipe or frozen pipe in Devon — including the Dartmoor fringe villages of Princetown, Lydford, Mary Tavy, and Chagford — our emergency plumber and leak detection team is available 24/7 across the Tavistock service area.