How to Stop a Dripping Outside Tap at the Packing Gland and Replace the Washer
A dripping outside tap is one of those small but persistent issues that can quietly waste water and push up your bill. A single slow drip every second can waste over 5,000 litres a year in a typical UK home, which is money quite literally going down the drain. Knowing how to stop a dripping outside tap at the packing gland and replace the washer is a practical skill that saves money, avoids slippery paths, and prevents long term damage to walls and pipework.
Most external taps fitted in UK homes are simple compression fittings, but weather exposure and wear mean they fail more often than indoor taps. Fortunately, the majority of leaks can be sorted in under an hour with basic tools and a bit of know how.
This guide is written from a tradesperson’s perspective, covering not just how to fix the issue but how to do it properly and avoid repeat failures. You will also get realistic cost expectations, common pitfalls, and advice on when to call in a professional.
Why Outside Taps Start Dripping
Outside taps, often referred to as garden taps or bib taps, are exposed to temperature swings, frost, and frequent use. Over time, seals degrade and components loosen. There are two common leak points.
- The tap spout, caused by a worn or damaged washer
- The handle area, caused by a loose or failing packing gland
If water drips from the spout when the tap is turned off, the washer is usually the problem. If water seeps from behind the handle when the tap is turned on, the packing gland needs tightening or repacking.
Wear and Tear from Daily Use
Every turn of the tap compresses the washer against the valve seat. Over time, this repeated pressure hardens and distorts the rubber. In busy households where hoses are frequently connected and disconnected, this wear accelerates.
Frost Damage and Expansion
One of the biggest causes of a leaking outdoor tap UK homeowners see is frost. Water trapped inside the tap freezes, expands, and can crack internal components. Sometimes the damage is subtle. The tap may still work, but the internal seal surfaces become uneven, leading to slow but constant drips.
Signs of frost damage include stiffness when turning the tap, hairline cracks on the tap body, or leaks that worsen after cold weather.
Limescale Build Up in Hard Water Areas
In areas such as the South East and parts of the Midlands, hard water leaves mineral deposits inside the tap. This build up can prevent the washer from sitting flush on the valve seat. Even a brand new washer will struggle to seal properly if the seat is rough or coated in scale.
Worn or Damaged Valve Seat
The valve seat inside the tap body is where the washer presses to stop water. If this surface becomes pitted or uneven, it will cut into new washers or fail to seal. You can often see this by removing the valve and shining a torch inside. A smooth brass ring is ideal. If it looks scratched, ridged, or dull, it is likely worn.
Loose or Degraded Packing Gland
The packing gland prevents water escaping along the spindle when the tap is open. Over time, the internal packing compresses or degrades. This leads to leaks around the handle, especially under pressure.
Ignoring either fault leads to wasted water and can cause damage to brickwork or create icy patches in winter. According to Water UK, even small leaks can waste thousands of litres per year.
Quick Diagnosis Guide
| Symptom | Likely Cause | Recommended Fix |
|---|---|---|
| Drip from spout when off | Worn washer or damaged seat | Replace washer or tap |
| Leak from handle when on | Loose packing gland | Tighten or repack gland |
| Tap stiff to turn | Limescale or overtightened gland | Clean or adjust gland |
| Persistent leaks after repair | Cracked body or worn seat | Replace tap |
Tools and Parts You Will Need
Most garden tap repair jobs can be handled with standard household tools. You do not need specialist plumbing equipment.
- Adjustable spanner or set of spanners
- Screwdriver, flat or cross head depending on tap
- Replacement tap washer, usually 1 2 inch for outdoor taps
- PTFE tape
- Cloth or rag
- Penetrating oil for seized parts
- Packing string or PTFE thread seal for gland repairs
Choosing the Right Washer Material
Not all washers are equal. Standard black rubber washers are fine for most uses, but for longevity outdoors, consider:
- EPDM washers, which resist weathering and UV exposure better
- Fibre washers, which cope well with higher pressure
Using the wrong type can mean the outside tap washer replacement fails within months.
When You Might Need Extra Tools
- Tap reseating tool if the valve seat is slightly damaged
- Grips or locking pliers for seized components
- Wire brush for cleaning scale and debris
A full washer kit costs between £3 and £10 from most UK DIY stores. Even if you are unsure of the exact size, buying a small assortment pack often works out best.
Before You Start, Isolate the Water Supply
Never attempt repairs without shutting off the water supply. Many outside taps have an isolation valve inside the property, usually under a kitchen sink or near where the pipe exits the wall. If you are unsure how to locate or operate it, you can refer to Mains Water Stopcocks and Isolation Valves Explained for Homeowners, which explains where to find valves and how to safely shut them off.
If there is no local isolation valve, you will need to turn off the main stopcock. Once shut off, open the tap fully to drain residual water.
This step typically takes five to ten minutes but prevents flooding and makes the job far easier.
How to Stop a Dripping Outside Tap at the Packing Gland
The packing gland sits just below the tap handle. Its job is to stop water escaping along the spindle when the tap is turned on.
Step by Step Repair
- Turn off the water supply and open the tap to release pressure
- Locate the gland nut directly under the handle
- Use a spanner to tighten the nut slightly, around a quarter turn at a time
- Turn the water back on briefly to check for leaks
- If leaking continues, remove the gland nut fully
- Wrap PTFE tape or insert packing string around the spindle
- Reassemble and tighten the nut securely
Signs the Packing Needs Full Replacement
If tightening does not help or the tap becomes very stiff, the internal packing has likely failed. In this case, repacking is a better long term fix than repeated tightening.
Often, a simple tighten resolves the issue. Over time, packing material compresses and loosens, allowing water through. Repacking is usually only needed on older taps.
Be careful not to overtighten the gland nut. This can make the tap stiff to turn and wear the spindle prematurely.
This job typically takes 10 to 20 minutes.
Replacing the Washer in an Outside Tap
If water drips from the spout even when the tap is fully turned off, the washer needs replacing. This is the most common outdoor tap repair.
Step by Step Washer Replacement
- Shut off the water supply
- Remove the screw on top of the tap handle
- Lift off the handle to expose the valve body
- Use a spanner to unscrew the valve from the tap body
- Locate the washer at the bottom of the valve
- Remove the retaining screw and replace the washer
- Reassemble all parts and tighten firmly
- Turn water back on and test
Checking the Valve Seat
Before reassembly, inspect inside the tap body. Use a torch and look for:
- Grooves or ridges
- Dull or pitted metal
- Limescale deposits
If the surface is not smooth, the new washer may fail quickly. A light clean can help, but deeper damage usually means replacing the tap.
Make sure the new washer is the correct size. A poor fit will not seal properly and may split under pressure. Standard sizes for outdoor taps are usually 1 2 inch, but older installations vary.
If the seating inside the tap body is damaged or pitted, a new washer may not fix the leak. In that case, replacing the entire tap is often quicker and cheaper.
This repair usually takes 20 to 30 minutes.
Repair vs Replace Tap
| Option | Cost | Time | Best For |
|---|---|---|---|
| Replace washer | £3 to £10 | 20 to 30 minutes | Simple dripping from spout |
| Repack gland | £2 to £5 | 10 to 20 minutes | Leaks around handle |
| Replace full tap | £10 to £30 plus labour | 45 to 90 minutes | Worn seat, frost damage |
| Upgrade to frost proof tap | £30 to £80 | 1 to 2 hours | Frequent winter issues |
Typical Costs in the UK
| Item or Service | Typical Cost |
|---|---|
| Tap washer pack | £3 to £10 |
| PTFE tape or packing string | £2 to £5 |
| New outside tap | £10 to £30 |
| Frost proof tap | £30 to £80 |
| Plumber callout | £60 to £120 |
| Emergency callout | £100 to £180 |
| Tap replacement labour | £80 to £150 |
Regional Price Differences
Costs in London and the South East are typically 20 to 40 percent higher than in the North or Wales. A simple garden tap repair that costs £80 in the Midlands could be closer to £120 in central London.
Timeframes for Different Scenarios
- Simple washer replacement, 20 to 30 minutes
- Packing gland repair, 10 to 20 minutes
- Seized or corroded components, up to 1 hour
- Full tap replacement with good access, 45 to 90 minutes
- Older pipework or awkward access, 2 to 4 hours
If you already have basic tools, the DIY route costs very little. Calling a plumber makes sense if access is awkward or the pipework is old and fragile.
Common Mistakes to Avoid
Even a simple job can go wrong if rushed. These are the most frequent issues seen on site.
- Forgetting to isolate the water supply, leading to flooding. Even a short burst of water can soak internal walls.
- Using the wrong washer size, causing continued leaks. Always match size and thickness carefully.
- Overtightening the gland nut, damaging the spindle. This leads to stiff operation and faster wear.
- Failing to clean debris from inside the tap before reassembly. Grit can stop a proper seal forming.
- Not checking for frost damage, which can crack internal components. Repairs will not hold if the body is compromised.
- Using excessive force on seized parts, which can snap fittings or twist pipework inside walls.
Another common mistake is assuming the issue is just the washer when the valve seat is worn. If repeated washer replacements do not solve the problem, the tap itself is likely at the end of its life.
What Can Go Wrong With DIY Repairs
Most outdoor tap repairs are straightforward, but there are a few risks worth understanding.
Seized and Corroded Components
Older taps, especially those fitted over ten years ago, often seize due to rust and limescale. Applying too much force can shear the spindle or round off fittings, making removal much harder.
Hidden Pipework Damage
If the tap is connected to older copper or even lead pipe, movement can loosen joints inside the wall. This can lead to slow leaks that are not visible until damp patches appear indoors.
Incorrect Reassembly
Misaligned washers, cross threaded parts, or loose fittings can lead to worse leaks than before. Even a small misalignment at 2 bar pressure will allow water through.
Frost Compromised Tap Bodies
A tap that looks intact may have internal fractures. If leaks persist or worsen after repair, especially following winter, the body itself may be compromised.
When to Stop DIY
If parts will not move after applying penetrating oil and waiting at least 10 minutes, forcing them further risks damage. At that point, it is more cost effective to call a professional.
You can also explore How to Repair Minor Plumbing Leaks, which covers safe techniques and helps you recognise when a small issue is becoming more serious.
Regulations and Safety Considerations
Outside taps must comply with UK water regulations, particularly around backflow prevention. Most modern installations include a double check valve to prevent contaminated water re entering the mains supply.
Water Supply Regulations 1999
The Water Supply Water Fittings Regulations 1999 require that potable water systems are protected from contamination. This applies directly to outside taps, especially where hoses may be submerged in buckets, ponds, or chemicals.
You can review official guidance via legislation.gov.uk.
WRAS Guidance and Practical Implications
The Water Regulations Advisory Scheme provides clear guidance on compliant products. In practical terms, this means:
- Using taps with built in double check valves
- Avoiding direct hose connections without backflow protection
- Ensuring fittings are approved for potable water use
Homeowner Responsibilities
Homeowners are responsible for ensuring their plumbing does not contaminate the public water supply. Installing a non compliant outside tap can lead to issues if inspected or if contamination occurs.
Water Efficiency Advice
Reducing leaks is part of wider water conservation. The UK government provides guidance on efficient water use at gov.uk, including how small fixes add up to significant savings.
Trade Standards and Competence
While outside taps do not require Gas Safe registration, using competent tradespeople is still essential. Many plumbers are members of recognised bodies and follow WRAS guidance, which helps ensure compliance and quality work.
Frost Protection Best Practice
- Install isolation valves inside the property
- Drain the tap before winter
- Use insulated covers
- Consider frost proof taps in exposed areas
When to Call a Professional Plumber
DIY works well for straightforward repairs, but there are clear situations where professional help is the better choice.
- The tap is leaking from inside the wall
- You cannot locate an isolation valve
- Pipework is old, corroded, or made from lead
- The tap body is cracked or heavily worn
- Multiple repair attempts have failed
If you are unsure, read When to Call a Professional Plumber vs. DIY, which breaks down realistic scenarios and helps you decide whether a job is safe to tackle yourself.
Professional plumbers will typically complete this type of repair within an hour. For more complex issues, such as hidden leaks or pipe replacement, expect half a day.
Alternative Fixes Without Replacing Pipework
Many homeowners worry that fixing an outdoor tap means digging up pipework. In reality, most problems are isolated to the tap itself.
If your issue goes beyond a simple drip, such as a persistent leak at the connection point, you can explore How to Fix a Leaking Outside Tap in a UK Home Without Digging Up Pipework, which explains practical repair options while avoiding unnecessary disruption.
Practical Repair Checklist
- Isolate water supply and drain tap
- Identify leak location, spout or handle
- Tighten packing gland if leaking from handle
- Replace washer if dripping from spout
- Check all seals and clean internal components
- Reassemble and test under pressure
- Inspect for frost damage or worn threads
Working through this checklist keeps the job organised and reduces the chance of missing a step.
FAQ
Why does my outside tap drip even after replacing the washer?
This usually means the valve seat inside the tap body is damaged or uneven. A new washer cannot form a proper seal against a worn surface. You can try lightly cleaning the seat, but if the damage is visible, replacement is the most reliable fix. If the tap is older or has seen frost damage, replacing it is often quicker and more cost effective.
Can I fix a leaking outdoor tap without turning off the main water supply?
Only if there is a local isolation valve serving that tap. Otherwise, you must shut off the main supply. Attempting repairs under pressure risks water damage and injury. If you cannot find a valve, refer to the internal guide linked earlier or consider having one installed for future convenience.
How long should an outside tap washer last?
In typical UK conditions, a washer lasts between one and five years. Heavy use, high pressure, and frost exposure reduce lifespan. Using better quality materials such as EPDM and checking annually before winter can extend life.
Should I replace the whole tap instead of repairing it?
If the tap is more than ten years old, heavily corroded, or has recurring leaks after repair, replacement is usually the better option. Upgrading to a frost proof tap can also prevent future issues, especially in exposed locations.
Is a dripping outside tap expensive in terms of water usage?
Yes. A slow drip can waste over 5,000 litres per year, and a faster drip or trickle can waste significantly more. Over time, this increases your water bill and contributes to unnecessary water use, particularly during warmer months when demand is already high.
Final Thoughts
Fixing a leaking outdoor tap UK homeowners commonly deal with is one of the more accessible plumbing jobs. Whether you are tightening a gland or carrying out an outside tap washer replacement, most repairs can be done quickly with minimal cost.
The key is taking a proper approach. Identify the source, use the correct parts, and check for underlying issues such as frost damage or worn valve seats. Quick fixes often lead to repeat problems.
If the job becomes more complex or you are dealing with older pipework, bringing in a qualified plumber is the safest route. Outdoor plumbing is deceptively simple, but poor repairs can lead to bigger problems later.
If you would rather leave it to a professional, you can post a job on BookaBuilderUK and get free quotes from vetted local tradespeople who can sort it quickly and correctly.
