How to Fix a Dripping Kitchen Tap in a UK Home Without Replacing the Whole Mixer
A dripping kitchen tap might not seem urgent, but in a typical UK household on a water meter, that steady drip can quietly add £15 to £30 to your annual bill and waste thousands of litres of water. Over a month, it is enough to fill several kettles without you ever using them. The good news is you can usually fix a dripping kitchen tap without replacing the whole mixer, and without specialist tools.
A dripping kitchen tap is one of the most common plumbing niggles in UK homes, and in most cases you can fix a dripping kitchen tap without replacing the whole mixer. The key is knowing what type of tap you have, identifying the worn component, and replacing that part correctly. Done properly, this is a straightforward repair that usually costs under £20 in parts and takes less than an hour.
Ignore it, and the impact adds up fast. A tap dripping once per second can waste more than 5,000 litres a year, pushing up your water bill and, for households on a meter, costing you real money. There is also the constant limescale staining around the spout and sink that becomes harder to remove over time.
This guide walks you through the process used by plumbers on site every day. It focuses on practical steps, realistic UK costs, typical parts found in British kitchens, and the common pitfalls that turn a simple fix into a call out.
Identify the Type of Kitchen Tap You Have
Before picking up a spanner, you need to know what sits inside your tap. Although kitchen mixers look similar, the internal mechanism varies and dictates the repair.
- Ceramic cartridge mixer taps, the most common in modern UK homes, usually quarter turn or half turn operation with a single or twin lever design
- Compression taps with rubber washers, older style, typically full turn taps with separate hot and cold handles
- Ceramic disc twin taps, similar to cartridge taps but with separate internals in each handle
If yours is a single lever kitchen mixer, you are almost certainly dealing with a ceramic cartridge. If it takes several turns to open and close, it is more likely a washer based compression setup.
If you are unsure, a quick read of How to Fix a Dripping Mixer Tap in a UK Home Replace the Cartridge and Stop the Leak gives a deeper breakdown of cartridge systems.
How to Visually Identify a Cartridge vs Washer Tap
A quick visual check can often tell you what you are dealing with before dismantling anything. Cartridge taps usually have a smooth, controlled quarter turn action and feel consistent throughout movement. Washer taps often feel looser and require several turns to fully open.
If you remove the handle and see a compact plastic or brass cylinder with ports, that is a cartridge. If you see a long spindle that compresses down onto a rubber washer, that indicates a traditional compression valve.
Common UK Tap Brands and What They Use
Many UK homes feature brands such as Bristan, Grohe, Franke, Howdens, and Wickes own brand taps. Bristan and Grohe almost always use ceramic cartridges, often brand specific. Budget taps from DIY sheds may use generic 35mm or 40mm cartridges, which are easier to replace but vary in quality.
Older council or ex local authority properties often still have compression taps with standard 1/2 inch or 3/4 inch washer valves.
How to Remove and Measure a Cartridge Safely
Once exposed, carefully remove the cartridge by loosening the retaining nut. Pull it straight up without twisting aggressively. Take note of any locating lugs at the base.
Measure:
- The diameter, commonly 35mm or 40mm in UK mixers
- The height of the cartridge
- The spline count on the top, often 20 or 24 splines
Take the old cartridge with you to suppliers such as Screwfix or Toolstation for an exact match. A mismatch of even a few millimetres will cause leaks or prevent the handle from fitting properly.
Tools and Parts You Will Need
Most repairs use basic hand tools. Avoid adjustable spanners that slip. A proper set of grips and the right size spanner makes the job cleaner and reduces the chance of damage.
- Adjustable spanner or set of open ended spanners
- Phillips and flat head screwdrivers
- Allen keys for hidden grub screws
- Long nose pliers
- Replacement washer or cartridge matched to your tap
- PTFE tape
- Silicone grease suitable for plumbing
- Old cloth or towel to protect the sink
Cartridges typically cost between £8 and £25 depending on brand. Washer kits are cheaper, often £3 to £10. If you have a branded tap such as Grohe or Bristan, sourcing the exact cartridge is worth it for longevity.
When choosing parts, pay close attention to spline count, diameter, and stem length. Many DIY repairs fail simply because the replacement looks similar but is not an exact fit. Screwfix and Toolstation both stock a wide range of cartridges and washers. Staff can usually help match parts if you bring the original in.
In hard water areas such as the South East of England, consider buying slightly higher quality cartridges with better ceramic discs. These tend to resist limescale better and last longer.
Isolate the Water Supply Properly
Never attempt this work with the water live. Even a small kitchen tap can release a surprising amount of water pressure.
Use the isolation valves under the sink if fitted. These are small inline valves on the hot and cold pipes. Turn them clockwise using a flat head screwdriver until fully closed.
If there are no isolation valves, you will need to turn off the main stopcock, usually found under the sink, in a cupboard, or where the mains water enters the property.
If you are not confident locating or operating these, read How to Isolate Water Supply in a Home Before Plumbing Repairs or Emergencies.
Open the tap after isolation to release any remaining pressure and confirm the supply is off.
How to Fix a Dripping Kitchen Tap Step by Step
1. Remove the Tap Handle
Look for a small screw, often hidden under a decorative cap or behind the lever. Carefully remove the cap with a flat screwdriver or fingernail. Undo the screw and lift the handle off.
If the handle feels stuck, avoid forcing it. Limescale can bond it in place. Try gently wiggling while pulling upward. In stubborn cases, pouring warm water over the handle can slightly expand the metal and help release it.
2. Access the Valve or Cartridge
Under the handle you will find either a retaining nut or a decorative shroud. Unscrew this to expose the internal component. Use a cloth to protect chrome finishes while loosening.
If the retaining nut is seized, apply penetrating oil and leave it for 10 minutes. Use steady pressure rather than sudden force. Sudden force can crack the tap body or round off the nut.
3. Remove the Faulty Component
If it is a ceramic cartridge, pull it straight out or unscrew it depending on design. For washer taps, remove the valve and check the rubber washer at the base.
Look for:
- Cracked or hardened washers
- Limescale build up on ceramic surfaces
- Worn O rings
If the cartridge is stuck, use long nose pliers to grip it gently and pull evenly. Avoid twisting too hard. If it will not budge, refit the handle loosely and use it as leverage to pull the cartridge straight up.
4. Replace and Reassemble
Fit the new part in exactly the same orientation. This is critical with cartridges, which often have alignment lugs.
Add a light smear of silicone grease to O rings. Wrap any threaded sections with PTFE tape if needed. Reassemble in reverse order, tightening firmly but not excessively.
If threads feel rough or misaligned, stop and re-seat the component. Cross threading is a common cause of leaks after reassembly and can permanently damage the tap.
5. Turn the Water Back On
Slowly reopen the isolation valves. Check for leaks around the handle and base. Run the tap fully to flush out debris.
If the drip has stopped and there are no leaks, the job is complete.
If the drip persists, shut the water off again and check that the cartridge is correctly seated and matches the original exactly. Even experienced plumbers double check this step, as it is the most common point of failure.
Repair vs Replace
| Scenario | Repair Cost | Replacement Cost | Time Required | Best Option |
|---|---|---|---|---|
| Minor drip, modern tap | £10 to £25 | £60 to £150 | 30 to 60 mins | Repair |
| Seized internal parts | £20 to £50 | £80 to £200 | 1 to 2 hours | Depends on damage |
| Corroded tap body | Not viable | £100 to £250 | 1 to 3 hours | Replace |
| Obsolete parts | Hard to source | £80 to £180 | 1 to 2 hours | Replace |
Typical Costs in the UK
| Item | Typical Cost | Notes |
|---|---|---|
| Replacement washer | £3 to £10 | Usually sold in packs |
| Generic ceramic cartridge | £8 to £20 | Check size and spline match |
| Branded cartridge | £15 to £40 | Longer lifespan, exact fit |
| Plumber call out | £60 to £120 | Depends on location |
| Labour for tap repair | £50 to £90 per hour | Usually under one hour |
In London and the South East, expect higher labour rates, often £80 to £120 per hour. In the North or Midlands, rates can be closer to £50 to £70 per hour.
Emergency or weekend call outs can increase costs significantly. A same day weekend repair can reach £150 to £250 depending on availability.
In most areas, a simple tap repair by a professional will total between £80 and £150. If multiple parts are seized or the tap is poor quality, replacement may be recommended instead.
Common Mistakes to Avoid
Most failed DIY tap repairs come down to a few recurring issues.
- Using the wrong cartridge, even a small mismatch in size or spline count will cause leaks or stiff operation
- Overtightening fittings, this can crack plastic housings or damage threads
- Forgetting to isolate water fully, leading to flooding under the sink
- Not cleaning limescale before reassembly, debris prevents proper sealing
- Damaging chrome finishes, always protect surfaces with a cloth when using tools
Signs You’ve Bought the Wrong Replacement Part
If the handle does not sit correctly, feels loose, or does not turn smoothly, the spline count or stem length is likely wrong. A tap that still drips immediately after replacement is another clear sign. Always compare old and new parts side by side before fitting.
How to Avoid Damaging Modern Tap Finishes
Modern chrome and brushed steel taps mark easily. Plumbers often wrap fittings in cloth or use soft jaw grips. Even a small slip with a metal spanner can leave permanent scratches.
Dealing with Limescale and Hard Water Build Up
In hard water areas such as Essex, Kent, and much of the South East, limescale is a constant issue. Soaking parts in a mild descaler before reassembly can improve sealing and extend lifespan. Regular cleaning every 6 to 12 months helps prevent recurring drips.
If you run into corroded fittings that will not budge, forcing them can snap pipework. This is a point where calling a plumber is the sensible move.
Troubleshooting Checklist if the Tap Still Drips
- Confirm the replacement part matches exactly in size and spline
- Check the cartridge is fully seated and aligned
- Inspect the valve seat for debris or pitting
- Flush the tap body before reinstalling parts
- Ensure O rings are lubricated and intact
- Verify water pressure is not excessively high
Work through each step methodically. In many cases, the issue is minor and easily corrected.
When a Drip Indicates a Bigger Problem
Not every drip is just a worn washer or cartridge. Watch for these warning signs.
- Water leaking from the base of the tap rather than the spout
- Persistent dripping after replacing internal parts
- Low water pressure in one or both supplies
- Rust coloured water or debris
For example, in a typical semi detached UK home with older pipework, a persistent drip combined with low pressure could indicate partially blocked supply pipes. In flats, pressure fluctuations from shared systems can damage cartridges more quickly.
Tap body corrosion is another issue. Once the internal seating surface wears out, even a new cartridge will not seal properly. Repair is rarely viable at that point, and replacement is the only long term fix.
Indicative repair costs for underlying issues vary. Replacing section of pipework may cost £150 to £400. Addressing pressure issues with a pressure reducing valve can range from £100 to £250 installed.
These could point to deeper issues such as worn tap bodies, supply pipe corrosion, or pressure imbalances. The How to Repair Minor Plumbing Leaks guide covers spotting and managing early stage plumbing faults.
DIY vs Calling a Professional Plumber
Replacing a washer or cartridge is well within reach for most homeowners. The risks are low if the water is properly isolated and the correct parts are used.
However, there are clear situations where a professional is the better choice. Tight access under sinks, seized fittings, or uncertainty about the tap model can quickly turn a simple job into wasted time and damaged components.
If you are unsure, this guide explains the tipping point clearly, When to Call a Professional Plumber vs. DIY.
Safety and UK Standards to Keep in Mind
While changing a tap cartridge is not regulated work, plumbing systems in the UK must still comply with the Water Supply Regulations.
You can review the official guidance here, Water Supply Regulations and Byelaws.
WRAS approval means a component has been tested to ensure it does not contaminate drinking water and performs safely under UK conditions. Using non approved parts can introduce risks such as backflow contamination or premature failure.
Check WRAS listings here, https://www.wrasapprovals.co.uk.
The Health and Safety Executive also provides general advice on safe manual work and tool use, https://www.hse.gov.uk.
Common Tap Types vs Repair Method
| Tap Type | Common Issue | Typical Fix | Difficulty |
|---|---|---|---|
| Single lever mixer | Worn cartridge | Replace 35mm or 40mm cartridge | Easy |
| Twin handle mixer | Worn ceramic discs | Replace cartridges in each handle | Medium |
| Compression tap | Perished washer | Replace rubber washer | Easy |
| Pull out spray tap | Internal valve wear | Replace cartridge or full unit | Medium |
Practical Checklist Before You Start
- Identify tap type and source correct replacement part
- Confirm isolation valves are working
- Gather all tools before starting
- Protect sink surfaces with a cloth
- Take a photo before disassembly for reference
- Allow 30 to 60 minutes for the job
This preparation prevents most mid job setbacks.
FAQ
Why is my kitchen tap still dripping after replacing the cartridge?
This usually comes down to using the wrong cartridge or debris inside the tap body. Even a small piece of limescale can prevent a proper seal. Remove the cartridge again, flush the tap, and check that the replacement matches exactly in size and alignment. Also inspect the valve seat inside the tap. If it is scored or worn, the new cartridge will not seal properly. In that case, replacing the entire tap may be the only reliable fix.
Can I fix a dripping tap without turning off the water?
No. Even experienced plumbers isolate the supply before working on taps. Leaving the water on risks sudden pressure release, especially in homes with combi boilers where pressure can be higher than expected. Isolation valves under the sink make this quick and controlled. If they are missing or faulty, it is worth having them fitted as a separate job, as they make future maintenance far easier and safer.
How long should a kitchen tap cartridge last?
In normal UK conditions, a ceramic cartridge should last between 5 and 10 years. In hard water areas, the lifespan can drop to 3 to 5 years due to limescale build up on the ceramic discs. Regular cleaning and occasional operation of the tap through its full range can help prevent stiffness and prolong life. Higher quality branded cartridges tend to last longer than cheaper generic alternatives.
Is it worth repairing an old tap?
If the tap body is solid and parts are still available, repairing is usually the most cost effective option. However, if you notice corrosion, pitting, or difficulty sourcing parts, replacement becomes more practical. Modern taps are generally more water efficient and easier to maintain. In many cases, spending £80 to £150 on a new tap saves repeated repair costs over the next few years.
Why does my tap drip more at night?
This is often due to higher mains pressure when overall water demand is lower. Late at night, fewer households are using water, so pressure in the system rises slightly. This increased pressure can push past worn seals or cartridges more easily, making the drip more noticeable. Installing a pressure reducing valve can help if high pressure is a consistent issue.
Final Thoughts
Being able to fix a dripping kitchen tap yourself is a practical skill that saves money and prevents long term wear on your plumbing. In most UK homes, the fix is straightforward once you identify the correct internal part and take a methodical approach.
If the job turns out to be more involved than expected, or you want it handled with zero hassle, you can post a job on BookaBuilderUK and get free quotes from vetted local tradespeople.
