How to Fix a Dripping Outside Tap in Frosty Weather and Prevent It Happening Again

A dripping outside tap in frosty weather is more than an annoyance. On a typical UK winter morning, with overnight temperatures dropping to minus 3 or lower, a small drip can freeze, expand and turn into a split fitting by lunchtime. Many homeowners first notice it when the hose will not connect properly or water pools against the wall. Left unchecked, that slow drip can escalate into a burst pipe inside the wall, leading to damp patches, ruined plaster and repair bills that can easily exceed £300 to £800. Knowing how to deal with a dripping outside tap in frosty weather quickly and properly can prevent a minor issue becoming a disruptive and expensive repair.

This guide is written from the perspective of someone who deals with these faults on site every winter. It covers realistic fixes, when to leave it to a plumber, expected costs, and how to future proof your external taps against frost.

Why Outside Taps Fail in Frosty Weather

Outside taps, often referred to as hose bib taps, are particularly vulnerable because they are exposed to the elements and usually connected to pipework that runs through unheated areas such as garages, voids or cavity walls. In many UK homes, especially older terraces and semis, the pipe feeding the tap is routed through external brickwork with little or no insulation.

When temperatures dip below zero, any standing water inside the pipe or tap body begins to freeze. Water expands by around 9 percent when it turns to ice. That expansion creates internal pressure that has nowhere to go, especially in a closed system like a tap that has been shut off.

This expansion puts pressure on joints, washers and the tap body itself. Brass taps can crack internally without any visible sign from the outside. Washers become brittle and lose their flexibility. Compression joints can shift slightly. In many cases, the leak only becomes visible once temperatures rise and the ice melts, which is why a leaking outdoor tap often appears after a cold snap rather than during it.

Real world example. A common callout involves a tap that worked fine through autumn but begins dripping in January. On inspection, the washer has hardened and split, but there is also a hairline crack in the tap body caused by repeated freeze and thaw cycles. Replacing just the washer would not solve it.

Common causes include:

• Split internal washer or damaged valve seat, often due to repeated freezing
• Hairline cracks in the tap body due to frost expansion
• Loose compression fittings behind the wall caused by movement in frozen pipework
• Frozen pipework partially blocking flow, causing pressure imbalance and forcing water past seals
• Lack of isolation valve or internal drain down facility, leaving water trapped in winter

If the tap is dripping during a freeze, there is a strong chance the damage has already occurred internally.

How to Fix a Dripping Outside Tap in Frosty Weather

The right fix depends on the cause. In freezing conditions, you should work carefully and avoid forcing any components, as cold metal becomes more brittle and easier to crack.

Tools and Materials You May Need

• Adjustable spanner or correct size spanners
• Flathead and crosshead screwdrivers
• Replacement tap washers, typically 12 mm
• PTFE tape
• Cloth or towel for water control
• Bucket
• Silicone grease for reassembly

Safety Considerations

• Always isolate the water supply before dismantling
• Avoid applying heat directly to pipes or taps
• Be cautious working on ladders or in icy conditions outside
• If electrics are nearby, ensure there is no water contact risk

Step 1. Check if the Pipe Is Frozen

If water flow is reduced, spluttering or stops completely, the supply pipe may be partially or fully frozen. You might also notice frost on exposed sections of pipe or hear a dull thud when tapping it lightly.

Do not apply direct heat such as a blowtorch. Instead, gently warm the area using a hot water bottle, warm damp cloths, or by increasing ambient temperature indoors if the pipe runs through an internal wall.

If the pipe does not thaw within 30 to 60 minutes, or if you suspect it is frozen inside a wall, it is better to stop and reassess rather than forcing the issue.

The Health and Safety Executive advises against using open flames near pipework due to fire risk. You can refer to their guidance here: https://www.hse.gov.uk/fireandexplosion/fire-prevention.htm

Step 2. Isolate the Water Supply

Before dismantling anything, isolate the water supply feeding the tap. Most properly installed outside taps should have an internal isolation valve on the supply line, often under the kitchen sink or in a utility area.

If you are unsure how to do this safely, refer to How to Isolate Water Supply in a Home Before Plumbing Repairs or Emergencies.

If there is no dedicated isolation valve, you may need to shut off the main stopcock. If the stopcock is stiff or has not been used in years, avoid forcing it as it can fail. In that case, a plumber may be needed.

Step 3. Replace the Tap Washer

This is the most common fix and usually resolves a steady drip from the spout.

• Remove the tap handle screw and take off the handle
• Use an adjustable spanner to unscrew the tap head
• Carefully withdraw the valve assembly
• Locate the washer at the base, usually held by a small screw
• Replace with a matching size washer
• Check the valve seat for scoring or debris
• Apply a small amount of silicone grease before reassembly
• Reassemble and tighten firmly without overtightening

If the tap still drips after replacing the washer, the issue is likely deeper, such as a worn valve seat or cracked body.

Step 4. Inspect for Cracks

If replacing the washer does not solve the problem, inspect the tap body and connecting pipe for cracks. Look closely around the outlet and threaded sections. Small cracks may only become visible when water pressure is restored.

Signs this fix will not work include continued dripping, visible dampness around the tap body, or water seeping from behind the wall plate.

If you see any sign of cracking, the entire tap will need replacing. Temporary fixes such as sealant or PTFE tape will not hold under pressure.

Step 5. Tighten or Reseal Connections

Check the compression fittings behind the tap. Frost movement can sometimes loosen these slightly.

If accessible, tighten the nut gently. If leaking persists, dismantle and reassemble using fresh PTFE tape or replace the olive.

For guidance on more involved fixes without disturbing buried pipework, see How to Fix a Leaking Outside Tap in a UK Home Without Digging Up Pipework.

Step 6. Test the Repair

Turn the water supply back on slowly. Check for:

• Drips at the spout
• Leaks at joints or behind the wall
• Unusual noises indicating trapped air or pressure issues

If the tap runs cleanly and shuts off fully, the repair has been successful. Monitor it over the next 24 hours for any signs of recurring leaks.

Troubleshooting Checklist for a Leaking Outdoor Tap

• Steady drip from spout, likely worn washer
• Leak around tap body, possible frost crack
• Poor flow or spluttering, partially frozen pipe
• Leak inside house near pipe entry, loose compression fitting or split pipe
• Drip after thaw, damage already caused by ice expansion

This quick checklist helps identify whether a simple outside tap repair UK job is enough or if further investigation is needed.

Typical Costs for Repair or Replacement

Costs vary depending on accessibility, severity of damage, and whether frost has affected internal pipework. Prices also vary regionally.

Job Type	Labour Cost	Materials	Total Typical Cost
Washer replacement DIY	£0	£2 to £10	£2 to £10
Full tap replacement DIY	£0	£10 to £30	£10 to £30
Plumber standard repair	£70 to £120	£5 to £30	£80 to £150
Frost proof tap installation	£80 to £180	£40 to £120	£120 to £300
Repair burst pipe	£120 to £300	£20 to £100	£150 to £400+

In London and the South East, labour rates are often 20 to 40 percent higher. Emergency callouts in winter evenings or weekends can add £80 to £150 on top of standard rates.

Preventing Outside Tap Freezing and Dripping

Prevention is far cheaper than repair. A properly protected outside tap should last years without issue, even in harsh UK winters.

Insulation Types and Best Practice

Foam pipe lagging is the most common solution. For UK conditions, 19 mm thick insulation is suitable for most internal pipes in unheated spaces, while 25 mm or thicker is better for exposed external sections. Insulation should comply with relevant British Standards for thermal performance.

All joints and bends should be fully covered, as gaps are where freezing often begins. In loft spaces or garages, combining insulation with draft reduction improves effectiveness.

Install a Frost Proof Tap

Frost proof taps have an extended valve that shuts off water inside the heated part of the property. This design prevents water remaining in the exposed section.

Feature	Standard Tap	Frost Proof Tap
Cost	£10 to £30	£40 to £120
Lifespan	5 to 10 years	10 to 20 years
Installation complexity	Low	Moderate
Freeze resistance	Low	High
Suitability for UK climate	Basic protection only	Highly suitable

These are increasingly considered best practice for new installations.

Fit a Double Check Valve

Under UK Water Supply Regulations, an outside tap should include a double check valve to prevent backflow contamination. Fittings should be WRAS approved to ensure compliance and reliability. You can verify approved products via https://www.wrasapprovals.co.uk.

You can read more about these requirements via the UK Government guidance here: https://www.gov.uk/guidance/water-supply-water-fittings-regulations-and-byelaws

Use an Isolation Valve and Drain Down

A simple but effective approach is to isolate the tap from inside and drain any remaining water before winter.

• Shut off the internal isolation valve
• Open the outside tap fully
• Allow all water to drain out
• Leave the tap slightly open to prevent pressure build up

This removes the risk of trapped water freezing.

Fit an Outside Tap Cover

These insulated covers cost around £5 to £15 and provide a decent first line of defence against frost. They are especially useful for exposed north facing walls.

Identifying Hidden Frost Damage Inside Walls

Not all frost damage is immediately visible. In many cases, the pipe feeding a frozen garden tap runs through brickwork or cavity walls.

Warning signs include:

• Damp patches or staining on internal walls
• Drop in water pressure when using taps elsewhere
• Musty smells indicating trapped moisture
• Unexplained increase in water bills

If you notice these signs after a freeze, the damage may be inside the wall. At that point, a professional inspection is usually required.

Common Mistakes to Avoid

Every winter, the same avoidable issues come up on sites across the UK.

• Leaving hoses connected, which traps water and increases freezing risk inside the tap
• Failing to isolate and drain the tap, leading to internal ice expansion
• Using excessive force on frozen taps, which often causes the brass body to crack
• Applying direct heat such as blowtorches, increasing fire risk and damaging fittings
• Ignoring small drips, which often signal internal damage that will worsen
• Skipping installation of a check valve, risking contamination and non compliance

Even experienced DIYers can overlook these in a rush to solve the immediate problem.

When to Call a Professional Plumber

Some situations move beyond a straightforward DIY fix.

• If a repair takes longer than one to two hours without progress
• Persistent leaks after washer replacement
• Evidence of internal pipe damage or pressure issues
• Leaks inside the property near the tap connection
• No accessible isolation valve
• Frozen pipework inside walls or floors

If you are unsure, refer to When to Call a Professional Plumber vs. DIY.

Attempting more complex repairs without experience can make matters worse, particularly if pipework is buried or runs through brickwork.

Practical Winter Checklist for Outside Taps

This is the routine many tradespeople follow for clients each autumn.

• Disconnect and store garden hoses
• Inspect tap and fittings for wear or corrosion
• Install or check insulation covers
• Lag any exposed internal pipework
• Confirm isolation valve works correctly
• Drain down the system before the first frost

Spending an hour on this in October or November can prevent expensive problems in January.

FAQ

Why does my outside tap drip more after a freeze?

This usually means frost has damaged an internal component such as a washer or valve seat. As the ice melts, water flows through the damaged area, causing a drip. It can also indicate a small crack in the tap body that only becomes apparent under normal pressure. In many cases, the damage worsens over repeated freeze and thaw cycles.

Can a dripping tap freeze and burst?

Yes. A drip does not protect against freezing. If water remains inside the pipe, it can freeze, expand and cause a burst. In fact, a dripping outside tap in frosty weather often signals that freezing has already affected the internal components. Prompt repair reduces the risk of escalation.

Is it safe to use an outside tap in freezing weather?

It is generally best to avoid using outside taps during sub zero conditions unless they are frost proof. Using them introduces fresh water into exposed pipe sections that may freeze soon after use, increasing the likelihood of damage.

Do I need planning permission to replace an outside tap?

No. Replacing an outside tap is considered minor plumbing work and does not require planning permission. However, it must comply with Water Supply Regulations, including the use of backflow prevention and WRAS approved components where required.

How long should an outside tap last?

A standard brass outside tap should last 5 to 10 years under normal conditions. Frost exposure without protection can reduce this lifespan significantly. Frost proof models typically last longer due to their internal shut off design.

How much does it cost to fix a frozen or dripping outside tap in winter?

For a simple leaking outdoor tap repair, such as replacing a washer, costs can be as low as £80 to £150 with a plumber. More complex issues involving frozen or split pipes can rise to £200 to £400 or more, especially if access is difficult. Emergency winter callouts often carry additional charges, particularly in cities.

Final Thoughts

A dripping outside tap in frosty weather is rarely just a minor fault. It is often the first visible sign of freeze related damage that can escalate quickly if ignored. The good news is that most issues are straightforward to fix with basic tools and a bit of care, provided you catch them early.

Investing in prevention, such as isolation valves, pipe insulation and frost proof taps, pays for itself many times over. If the problem looks more complex or you suspect hidden damage, getting a qualified plumber in early will limit both cost and disruption.

If you need help, you can post a job on BookaBuilderUK to receive free quotes from vetted local tradespeople who can sort the issue quickly and properly.