Fix a Dripping Tap: DIY Washer Replacement Guide

By The FixDelivered Team · Updated 2026-07-04 · 6 min read

A dripping tap can be incredibly annoying, not to mention wasteful. According to Water UK, a single dripping tap can waste over 5,500 litres of water a year – enough to fill a paddling pool every week for the entire summer! Most commonly, a persistent drip is caused by a worn-out tap washer, a small component you can often replace yourself with a few basic tools. This guide will walk you through the process, helping you save water, money, and your sanity.

Why Do Taps Drip?

The vast majority of dripping taps are caused by a worn or perished rubber washer inside the tap mechanism. Over time, constant use and exposure to water pressure can cause these washers to harden, crack, or lose their elasticity. When this happens, the washer can no longer form a tight seal against the tap's valve seat, allowing water to slowly seep through and drip from the spout. While this guide focuses on traditional compression taps, which are most common for washer replacement, other tap types like ceramic disc taps have different internal mechanisms and may require a different approach or professional help.

Tools and Materials You'll Need

Adjustable spanner or a set of spanners
Flathead screwdriver
Philips head screwdriver (if needed for handle screws)
New tap washer(s) – it's often best to buy a multi-pack with various sizes
PTFE tape (plumber's tape)
Old cloths or towels
Bucket or small container
Wire brush (optional, for cleaning)
Penetrating oil (optional, for stubborn parts)

Safety First!

Before you begin any plumbing work, it's crucial to prioritise safety:

Turn off the water supply: This is the most critical step. Locate the isolation valve for the tap (usually under the sink) and turn it clockwise until it's fully closed. If there isn't one, you'll need to turn off the main stopcock for your property.
Protect your surfaces: Place old towels or cloths in the sink and around the work area to catch any drips and prevent damage from tools.
Be careful with tools: Use the correct size spanner to avoid slipping and damaging the tap or injuring yourself.
Don't force anything: If a part is stuck, apply penetrating oil and wait, or seek professional help rather than forcing it and potentially causing more damage.

Step-by-Step Guide to Fixing a Dripping Tap

Follow these steps carefully to replace your tap washer:

Turn off the water supply: As mentioned, locate and turn off the isolation valve for the specific tap. If you can't find one, turn off the main stopcock for your house. Open the tap fully to drain any remaining water from the pipes.
Protect the sink: Place a cloth or towel over the sink plug hole to prevent small parts from falling down the drain. Lay another cloth around the base of the tap.
Remove the decorative cap: Most taps have a small decorative cap (often red or blue for hot/cold) on top of the handle. Carefully pry this off with a small flathead screwdriver.
Unscrew the tap handle: Beneath the cap, you'll usually find a screw. Use a screwdriver to loosen and remove this screw, then lift the tap handle off.
Remove the tap headgear: This is the main body of the tap that the handle sits on. It's usually hexagonal at the base where it meets the tap body. Use your adjustable spanner to grip this hexagonal part and turn it anti-clockwise to unscrew it. It might be stiff, so apply steady pressure. You may need to hold the tap spout to prevent it from turning.
Locate and remove the old washer: Once the headgear is removed, you'll see a small rubber washer at the bottom of the spindle or in the tap's body. Carefully prise out the old, worn washer using your screwdriver. Note its size and shape.
Install the new washer: Take your new washer (ensuring it's the correct size) and fit it into the same spot. It should sit snugly. If there are O-rings on the spindle, inspect them for wear and replace them if necessary. You can also apply a little PTFE tape to the threads of the headgear before reassembly for an extra seal, though this isn't always strictly necessary for the washer itself.
Reassemble the tap: Carefully screw the tap headgear back into the tap body, turning it clockwise until it's hand-tight, then use your spanner to tighten it a quarter turn more. Do not overtighten, as this can damage the new washer or the tap itself.
Replace the handle and cap: Put the tap handle back on, secure it with its screw, and then snap the decorative cap back into place.
Turn the water supply back on: Slowly turn the isolation valve or main stopcock back on. Turn the tap on and off a few times to check for any leaks around the base of the headgear or from the spout. If there's a slight drip, you might need to tighten the headgear a tiny bit more, but remember not to overtighten.

When to Call a Professional

While fixing a dripping tap by replacing the washer is a common DIY task, there are times when it's best to call in a professional plumber. You should consider professional help if:

The leak persists: If the tap continues to drip after you've replaced the washer, the issue might be more complex, such as a damaged tap seat or a fault with the tap itself.
You have a ceramic disc tap: These taps don't use traditional washers and require different repair kits or cartridge replacements.
You can't turn off the water: If you can't locate an isolation valve or the main stopcock, or if they are seized, you'll need a plumber to safely isolate the water supply.
You're unsure or uncomfortable: If you're not confident in your DIY skills or are worried about causing further damage, it's always safer to call an expert.
The tap is old or integrated: Some older or more complex mixer taps can be difficult to disassemble without specialist knowledge.

A plumber typically charges between £75 and £150 for a call-out to fix a dripping tap, depending on the complexity and your location in the UK (prices are a rough guide for 2026). If you find yourself in need of a professional, FixDelivered can connect you with vetted local plumbers quickly and efficiently. Our platform allows you to agree on the plumber's callout fee upfront, ensuring no hidden surprises.

Preventative Measures

To prolong the life of your tap washers and prevent future drips, avoid overtightening your taps when turning them off. A gentle but firm turn is usually sufficient to stop the water flow. Excessive force can quickly wear out the washer or damage the tap's internal components.

Fixing a dripping tap yourself can be a rewarding and money-saving DIY project. However, if the job proves too difficult or the leak persists, don't hesitate to seek professional help. For reliable, vetted plumbers in your area, visit FixDelivered to find an expert who can resolve your plumbing issues promptly. Learn more about how our service works or browse available plumbers today.

Frequently asked questions

How much does a plumber charge to fix a dripping tap?

As a rough guide for 2026, a plumber in the UK typically charges between £75 and £150 for a call-out to fix a dripping tap, depending on your location and the complexity of the job. This usually covers labour and minor parts like a new washer.

How often should I replace tap washers?

Tap washers don't have a fixed replacement schedule; they should be replaced when they start to show signs of wear, such as a persistent drip from the tap. Lifespan depends on water pressure, water quality, and frequency of use.

Can I use any washer to fix a leaky tap?

No, you need to use a new tap washer that matches the size and type of the old one. Washers vary in diameter and thickness. It's often best to buy a multi-pack of assorted washers to ensure you have the correct size on hand.

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