An outside tap sits in the open air on an exposed wall, with a short length of pipe running through the brickwork. That makes it one of the first things to freeze in a London cold snap. A split outside tap pipe can leak inside the wall or kitchen, so it is worth five minutes of your time each autumn. Here is how to winterise an outside tap properly.
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Step 1: Find the isolation valve
Most properly fitted outside taps have an isolation valve on the pipe inside the house, often under the kitchen sink or in a utility room, close to where the pipe goes through the wall. It may be a small lever or a slot you turn with a screwdriver.
Step 2: Turn it off
Turn the valve so the lever or slot sits across the pipe. This stops water reaching the outside section.
Step 3: Drain the tap
Go outside and open the tap fully. A little water will run out and then stop. Leave it open for a minute so the pipe drains, then close it. Some valves also have a small drain screw to release the last of the water.
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Step 4: Disconnect the hose
Remove hoses, spray guns and connectors. Water trapped in a hose fitting can freeze back into the tap.
Step 5: Fit an insulated cover
A foam or insulated tap cover costs a few pounds and gives extra protection, especially on north-facing walls.
No isolation valve?
Older outside taps are sometimes connected without one, which means you cannot drain them without turning off the whole house. Having an isolation valve fitted is a quick, inexpensive job and makes winterising easy every year.
Frequently asked questions
When should I winterise my outside tap?
Before the first frost, usually October or November in London.
What if my outside tap has already frozen?
Do not use it. Turn off the isolation valve or stopcock and let it thaw naturally, then check for leaks.
Do frost-free outside taps exist?
Yes. Frost-free taps have the valve set back inside the wall, where it stays warmer.
