You turn off the tap… and drip drip drip — the leak begins. It’s annoying, wasteful, and surprisingly common. The good news? Most mixer tap leaks can be fixed at home in under an hour, without calling out a plumber.
At Bathroom Spare Parts, we speak to customers every week who assume they need a whole new tap. But 9 times out of 10, it’s just a worn cartridge or washer causing the problem.
In this guide, we’ll show you exactly how to identify the cause, what part you need, and how to fix it yourself.
🛠️ What Causes a Mixer Tap to Leak?
A mixer tap combines hot and cold water through a single spout — stylish and compact, but prone to a few wear-and-tear issues.
Most common reasons for leaking:
A worn ceramic cartridge (the bit that controls flow and temperature)
Perished O-rings or seals
Limescale buildup inside the mechanism
A loose tap handle or valve body
🔍 How to Identify Where the Leak Is Coming From
Before grabbing your tools, take a look at where the drip is coming from:
| Leak Location | Likely Cause |
|---|---|
| Dripping from spout | Worn ceramic disc cartridge |
| Leaking around base | Faulty O-rings or seals |
| Water under the sink | Loose pipework or connection |
| Handle feels loose/stiff | Cartridge or handle issue |
👨🔧 Most leaks from the spout or around the handle can be fixed by replacing the tap cartridge.
🧰 Tools You’ll Need
Allen key or small screwdriver (for removing the handle)
Adjustable spanner or box spanner
Soft cloth or towel
Replacement mixer tap cartridge (we’ll help you find the right one)
Optional:
White vinegar (for cleaning limescale)
Silicone grease (for resealing)
📦 Step-by-Step: How to Replace a Leaking Mixer Tap Cartridge
1. Turn Off the Water Supply
Locate your isolator valves under the sink and turn them off (turn 90° to the pipe direction). Open the tap to release any remaining water.
2. Remove the Tap Handle
Most handles are secured with a small grub screw. Look underneath or behind the handle — loosen it with an Allen key.
3. Take Off the Decorative Shroud
If your tap has a collar or cover, unscrew it gently by hand or with a rubber strap wrench.
4. Unscrew the Cartridge
Using an adjustable spanner, carefully loosen the cartridge and remove it. Be sure to note the orientation or take a photo first.
5. Clean the Tap Body
Use white vinegar and a soft cloth to clean any limescale or dirt. This ensures a good seal when the new cartridge goes in.
6. Insert the New Cartridge
Make sure it’s the correct type (we'll explain more below), then slot it in and screw it back down firmly — but don’t overtighten.
7. Reassemble and Test
Put everything back together, turn the water back on, and test. No more dripping? You’re done.
💡 If your tap still leaks after fitting the cartridge, the seals may need replacing too. We stock full service kits for many brands.
🧩 How to Find the Right Cartridge
Cartridges vary in:
Size (height and diameter)
Number of splines (the ridged connector for the handle)
The shape of the base (3-lug, 2-lug, offset, etc.)
Number of control levers (single vs twin lever)
Options:
Check your tap brand and model (if known)
Measure the height, diameter, and spline count of the old cartridge
📸 Or simply send us a photo of your tap and the old cartridge
📧 sales@bathroomspareparts.co.uk
📞 020 3940 9330
We’ve matched thousands — from Roca and Ideal Standard to Bristan, Grohe, and no-name budget taps.
🔄 Can’t Find the Cartridge? Use a Universal Fit
We stock universal cartridges that fit 80%+ of modern mixer taps. These are ideal if:
Your tap is unbranded
The original part is discontinued
You need a quick fix without delay
Just send us your measurements and we’ll recommend a universal option that works.
💧 How to Prevent Mixer Tap Leaks in the Future
Avoid overtightening the handle when switching off — it wears the ceramic discs faster
Clean the spout aerator regularly to reduce pressure strain
Install a tap filter or descaler in hard water areas
Replace cartridges every 5–8 years depending on usage
🙋♀️ FAQ – Fixing Leaky Mixer Taps
Do I need a plumber?
Not usually. Most cartridge replacements are DIY-friendly and take under an hour.
What if my tap still leaks after replacing the cartridge?
It may be the seals or O-rings. We can help you find a service kit with all the parts.
Can I just replace the washers?
Not with ceramic disc cartridges — the whole cartridge needs replacing. Rubber washer taps (usually older) are different.
Do you stock coloured cartridges (e.g., red/blue, green, etc.)?
Yes — we stock branded and colour-coded parts by manufacturer.
🧠 Final Word: A Leaky Tap Doesn’t Mean a New Tap
A dripping mixer tap is frustrating — but you don’t need to spend £100+ on a replacement. In most cases, a £10–£25 cartridge swap fixes it completely.
At Bathroom Spare Parts, we’ll help you find exactly the right part — and talk you through fitting if needed. Whether you’re a homeowner, landlord, or tradesperson, we’ve got your back.
📧 sales@bathroomspareparts.co.uk
📞 020 3940 9330
🔍 Shop online: www.bathroomspareparts.co.uk