How to fix a dripping tap — no plumber needed
tap dripping once per second can waste roughly 10,000 litres of water a year. In many homes, the most likely cause is simple: a worn washer inside a traditional tap, and replacing it is usually a sub-one-hour repair.
Fixing a Dripping Tap
- Quick suitability checkif suitable
- Gather simple toolsthen
- One clean repair passafter repair
- Test the resultif fixed
- Washer likely worn
- Drip stops
- Retry once smarter
Table of Contents
Quick-reference field guide
Tap type check before disassembly
Use this guide only if the tap is likely a compression/washer tap. Signs: it usually takes multiple turns to fully open or close, and the leak comes from the spout when off. If it is a quarter-turn ceramic tap, the fault is more likely a cartridge or ceramic disc, not a simple washer. Decision rule: if you are unsure, remove the handle first and inspect before buying multiple parts.
Minimum tool kit
Essential tools: adjustable spanner, flat-head screwdriver, cross-head screwdriver, cloth. Best-fit extras: torch, small tray, phone camera, replacement O-ring. Tool choice rule: the spanner should grip the headgear nut tightly enough that it does not wobble on the flats. If the adjustable jaw is loose, reposition it before applying force; slipping once can round the nut and turn a 30-minute job into a much harder one.
Isolation valve confirmation
After turning the isolation valve clockwise until it stops, open the tap fully. Wait 5-10 seconds. Success threshold: water flow should stop and pressure should release. If water keeps flowing strongly after that, do not continue; either you have the wrong valve, the valve has failed internally, or the supply is not actually isolated. Place a cloth under the tap anyway, because a small amount of residual water is still normal during disassembly.
Washer matching guide
Match the old and new washer by outer diameter, inner diameter, and thickness. Even a slightly undersized washer can reduce the drip without curing it, which is why 'almost the same' is often a failed repair. Practical method: take the old washer to the hardware shop and compare directly. If the old washer is deformed, use the brass holder and stem as your secondary reference, but do not guess on thickness if you can avoid it.
O-ring replacement check
Replace the O-ring while the tap is apart, especially if you already have the headgear out. A failed O-ring usually causes leaking around the spindle or under the handle, not from the spout. Fit check: the O-ring should sit in its groove without twisting, stretching thin, or bulging. If the tap was not leaking around the spindle before but is after reassembly, the O-ring installation is the first thing to recheck.
Headgear nut handling
This is often the stiffest part of the job. Use steady pressure, not a sudden jerk. Time threshold: if it does not move after two or three controlled attempts, stop and improve your grip, confirm the spanner is square on the flats, and support the tap body if possible. Avoid over-force; damaging the tap body or connected pipework is a much bigger problem than a drip.
Reassembly order
Use this sequence exactly: headgear back in -> tighten snugly -> handle on -> screw in -> cap on -> restore water -> run tap briefly -> shut off -> observe. Tightening rule: snug is enough; do not overtighten decorative or small fasteners. If the handle alignment looks odd, remove and reseat the handle before final testing rather than forcing the screw tighter to compensate.
Test timing and success criteria
After restoring water, open the tap fully for a few seconds, then shut it off normally. Watch the spout for 30-60 seconds. Success means no continuing drip after residual droplets clear. A failure pattern is a steady drip every few seconds that keeps repeating beyond one minute. Also check around the handle and spindle during this minute; a dry spout with a new spindle leak is not a complete win.
Typical time and cost range
First-time DIY timing: 30-60 minutes if the parts come apart normally. If the headgear is seized or you need a hardware store run, expect 60-90 minutes total. Typical part cost is usually low: often just a few pounds or dollars for a washer and O-ring. Cost rule: if you start needing specialist tools, multiple wrong-size parts, or replacement assemblies, compare that against the value of a plumber visit.
Common failure signals and what they mean
Same exact drip as before: likely wrong washer, washer seated badly, or worn valve seat. Slower drip: repair partly helped; recheck washer match and seating. Leak around handle: O-ring issue. Tap feels stiff or gritty: reassembly problem, damaged internal parts, or seat wear. No water after reassembly: isolation valve still shut, internal part misassembled, or debris blocking flow. Use the signal to choose your next move; do not redo everything blindly.
Stop-and-escalate threshold
Stop DIY escalation if any of these happen: the isolation valve does not shut water off, the headgear nut begins to deform, the tap body starts twisting with the force, corrosion is severe, or a correct washer replacement makes no meaningful difference. One careful retry is reasonable. After that, the likely next issue is the valve seat or a less simple internal fault, and a tap reseating tool or plumber becomes the sensible next step.
A tap dripping once per second can waste roughly 10,000 litres of water a year. In many homes, the most likely cause is simple: a worn washer inside a traditional tap, and replacing it is usually a sub-one-hour repair.
What to know before you start
- This guide fits a traditional washer-style tap that drips from the spout when fully off.
- Your best first attempt is: isolate water -> replace washer and O-ring -> test -> read the result.
- If the drip remains unchanged after a correct washer swap, the valve seat may be worn.
- Take the old washer to the hardware shop if you're unsure on size; a near match is not good enough.
Start at the right level: is this your repair?
Use this quick check before you pick up tools.
You are in the right place if:
You may not be in the right place if:
Fast rule of thumb: if the tap turns through multiple rotations to open and close, a washer is likely involved. If it only turns a quarter turn, it may use a ceramic disc instead.
What you'll need
Keep the setup simple.
Optional but useful:
Your first attempt: do one clean repair pass
This is the core practice loop. Do not improvise yet; do one careful pass and then judge the result.
1. Isolate the water supply
Find the isolation valve under the sink for the affected tap.
- 1
Turn it clockwise until it stops
- 2
Open the tap fully
- 3
Confirm water stops flowing and pressure is released
Good feedback: the flow dies out quickly and stays off.
Poor feedback: water keeps running strongly. If that happens, do not continue until you have actually isolated the supply.
2. Remove the tap handle
- 1
Pry off the small decorative cap with a flat-head screwdriver
- 2
Remove the screw underneath
- 3
Lift the handle off
If the handle is stiff, wiggle gently. Do not lever hard against visible finished surfaces.
3. Unscrew the headgear
Below the handle is the headgear nut.
- 1
Fit the adjustable spanner snugly
- 2
Turn anticlockwise with steady pressure
- 3
Lift out the full headgear assembly once loose
Do not use jerky force. A controlled pull is less likely to round edges or stress the tap body.
4. Replace the washer and O-ring
At the base of the headgear, you'll find the washer held by a brass nut.
- 1
Remove the retaining nut
- 2
Take off the old washer
- 3
Fit the new washer so it sits flat and centered
- 4
Slide off the old O-ring
- 5
Fit the new O-ring in the same position
Best practice: put the old washer beside the new one and compare:
Match these exactly if possible:
- Outer diameter
- Inner hole size
- Thickness
5. Reassemble and test
- 1
Screw the headgear back in clockwise
- 2
Refit the handle, screw, and cap
- 3
Turn the isolation valve anticlockwise to restore water
- 4
Run the tap briefly
- 5
Turn it off and watch the spout
Give it 30-60 seconds. Some residual droplets can fall right after shutdown; a true ongoing drip keeps returning at a steady interval.
How to read the result
The test matters as much as the repair.
Good result
If you get this, you're done.
Weak result
This usually means the washer replacement helped, but something is still off:
Poor result
That points to incorrect reassembly, O-ring issues, a mismatched washer, or a worn seat.
Retry once, but retry intelligently
Do not keep repeating the same attempt. Change something specific.
If the drip slowed but did not stop
Try this second pass:
- 1
Isolate water again
- 2
Remove the headgear
- 3Check that the washer is the same diameter and thickness as the old one.
- 4
Confirm the retaining nut is secure
- 5
Make sure the washer sits flat, not tilted or pinched
- 6
Reassemble and test again
If water leaks around the handle
Focus on the O-ring.
If nothing changed at all
Inspect the valve seat if you can see it with a torch. If the metal surface the washer presses against looks rough, scored, or pitted, a new washer may not be enough.
At that point, your next options are:
A good Taim-style rule: one careful retry is smart; repeated guessing is not.
Want a more guided way to practise this?
FAQ
How do I know a worn washer is really the problem?
The strongest clue is where the leak appears. If water drips from the spout when the tap is turned off, and the tap is an older style that opens with multiple turns, a worn washer is a very common cause. If water is leaking from around the handle or spindle instead, the washer is less likely to be the main issue and the O-ring or gland area becomes more suspicious. If the tap is a quarter-turn ceramic type, this guide may not match the internal parts at all, so identify the tap style before buying washers.
What are the most common beginner mistakes when fixing a dripping tap?
The biggest mistake is starting before the water is actually isolated. Always open the tap after closing the isolation valve and confirm the flow stops, otherwise disassembly can become messy fast. The next common mistake is using a washer that is 'close enough' instead of correctly matched; slight size differences can leave you with a slower drip that still fails. Another frequent error is using too much force on the headgear nut or handle, which can damage finishes, round fasteners, or stress the tap body and pipework.
What if I cannot loosen the headgear nut?
First, stop increasing force and improve control. Make sure the adjustable spanner fits tightly on the nut flats and is not sitting at an angle. Try a few steady, deliberate pulls rather than sharp jerks, and support the tap body if you can reach it safely so you are not transferring all the force into the pipework. If the nut still will not move and you see deformation, corrosion, or the whole tap body twisting, that is your stop point; at that stage, avoiding damage is more important than winning the DIY repair.
How long should this repair take the first time?
If everything comes apart normally and you already have matching parts, a first-time repair usually takes 30 to 60 minutes. Most of that time is spent moving carefully, not actually swapping the washer. Add more time if the handle is stuck, the headgear is tight, or you need to take the old washer to a hardware shop for matching. A good planning rule is to set aside an uninterrupted hour, so you are not tempted to rush the reassembly or skip the final test.
How much should a DIY washer replacement cost?
Usually very little. The washer and O-ring are inexpensive parts, and many people already own the basic hand tools needed for the job. The real cost difference comes from getting the right size the first time; buying several guessed washers wastes time and can leave you uncertain about whether the problem is the part or your technique. If you find yourself needing a reseating tool, replacement headgear, or extra store trips, the economics start to shift and a plumber may become the more efficient option.
Is it safe to do this myself without shutting off water to the whole house?
Yes, if the local isolation valve works properly and you verify it before taking the tap apart. Close the valve, open the tap, and make sure the flow stops and pressure releases. Keep a cloth under the area because some trapped water may still drain from the assembly during removal. If there is no working isolation valve for that tap, or you cannot confirm that the supply is actually off, then the safe move is to shut off the main supply before continuing.
How do I know if the repair worked, and how long should I wait before deciding?
Run the tap briefly after reassembly, then turn it off normally and watch the spout for 30 to 60 seconds. A couple of leftover droplets right after shutoff can be normal, but a repeated drip pattern that continues beyond that window means the fault is not fully solved. Also inspect around the handle and spindle during the same test, because a successful washer replacement can still be undermined by a new O-ring leak. A complete fix means normal flow when open, no drip from the spout when off, and no leaks around the handle.
What if the drip slows down but does not fully stop?
That usually means your first attempt was directionally right but not fully correct. The most likely causes are a washer that is close but not exact, a washer that is not sitting flat, or a valve seat that is worn enough to prevent a perfect seal. Your best next step is one careful retry: isolate the water again, compare the new washer directly with the old one, check the retaining nut, and make sure the washer is centered and flat. If the second attempt still leaves a persistent drip, inspect the seat and consider a reseating tool or a plumber instead of repeating the same repair again.
Do I always need to replace the O-ring as well as the washer?
Not always, but it is usually the smart move while the tap is already apart. The washer mainly addresses dripping from the spout, while the O-ring helps prevent leakage around the spindle and handle area. Because the O-ring is inexpensive and accessible once the headgear is out, replacing it during the same repair reduces the chance that you fix one leak and expose another a week later. If you skip it, at least inspect the old O-ring for flattening, cracking, or visible wear before deciding.
When should I stop and call a plumber?
Call a plumber if the isolation valve does not work, the headgear nut is seized badly enough that the tap body starts twisting, corrosion is heavy, or the tap still drips after one well-executed retry with a correctly matched washer. Also stop if you discover that the tap is not actually a washer-style design, because continuing with the wrong repair model wastes time and can create new problems. The key decision rule is simple: if the next step requires specialist diagnosis, reseating, or significant force, the risk-to-reward balance has changed. Good DIY means knowing when the simple repair has ended.
Fix the likely cause first, then let the tap tell you what to do next
A dripping tap is often a small, cheap, high-leverage repair. If the tap is a washer-style design and the leak comes from the spout, replacing the washer and O-ring is the right first move.
Work the loop cleanly:
If the drip stops, you've solved a real household problem with basic tools. If it doesn't, you have still narrowed the fault properly — and that's exactly what good practical learning looks like.