How to Fix a Leaking Tap in Sheffield - A Step-by-Step Repair Guide

Published August 2026 | Leaking Tap Repair

This guide covers how to diagnose and repair a dripping or leaking tap at home, from identifying the type of fault to replacing worn washers, O-rings, and cartridges. It's written for Sheffield homeowners who want to have a go themselves before deciding whether to bring in a plumber.

A dripping tap is one of the most common domestic plumbing jobs our engineers deal with across South Yorkshire, and in most cases it's fixable without specialist tools. Left alone, a constantly dripping tap can waste thousands of litres of water per year - which ends up on your bill. The parts you'll need typically cost a few pounds. What matters is working methodically and knowing when you've reached the limit of what's safe to tackle yourself.

Before You Start - Safety First

The single most important thing before you touch a tap is knowing where your main stopcock is. In most Sheffield homes it's located under the kitchen sink, but in older terraced properties - common across Hillsborough, Burngreave, and Walkley - it can be in a ground-floor cupboard, under the stairs, or even outside in a small kerbside chamber. Find it before you begin.

For most tap repairs you can isolate the supply using the small isolation valves on the pipes directly beneath the tap. These are the inline valves fitted to the hot and cold supply pipes. If the slot runs in line with the pipe, the valve is open. Turn it 90 degrees with a flathead screwdriver so the slot runs across the pipe, and the water is off. If those valves don't exist or won't turn, go to the mains stopcock instead.

Once you've isolated the supply, turn the tap fully on to release the pressure in the line and drain out any water sitting in the pipes. This also confirms the supply is actually off - if water keeps running, the valve hasn't closed properly.

Before you dismantle anything: put the plughole in. Washers, O-rings, and small screws drop into drains in seconds and you won't get them back. Lay an old towel underneath to protect the basin or sink surface, and have a small bucket or bowl ready to catch residual water when you open things up.

What You Will Need

Tools

• Adjustable spanner or basin wrench
• Flathead and Phillips screwdrivers
• Allen key set (some tap handles use a small grub screw)
• Long-nose pliers
• Old cloth or rag to protect chrome finishes

Materials

What you need depends on the type of tap and where it's leaking from. Common replacements include:

• Rubber tap washers - typically a few pence to around 2 pounds each
• O-rings - available in assorted packs for 2 to 5 pounds
• Tap cartridge (for mixer and monobloc taps) - typically 5 to 30 pounds depending on brand and model
• PTFE tape - under 1 pound a roll
• Silicone grease or plumber's grease

Time Estimate

A pillar tap with a rubber washer typically takes 30 to 45 minutes if everything goes smoothly. A mixer tap with a cartridge can take up to 90 minutes, particularly if the cartridge is seized or if you need to source a matching replacement part. If you're working on an older property with stiff fittings or corroded components, give yourself extra time and don't rush the job.

Step-by-Step Instructions

Step 1 - Work Out What Type of Tap You Have

Not all taps work the same way, so identifying the type first tells you what needs replacing.

Traditional pillar taps - the separate hot and cold taps common in older kitchens and bathrooms - typically use a rubber washer mounted on a threaded spindle. When you turn the tap, the spindle screws down and presses the washer against a valve seat to stop the water. When the washer wears out, it can no longer form a proper seal and the tap drips.

Mixer taps and monobloc taps (single-lever units or twin-handled taps sharing one spout) generally use a ceramic disc cartridge. Two ceramic discs rotate against each other to control the flow. These are far more durable than rubber washers but do eventually wear, chip, or fail - especially if grit gets into the water supply.

Quarter-turn taps always use ceramic cartridges. If your tap opens and closes with a sharp 90-degree turn of the handle, that's what you're dealing with.

If you're unsure about the fault type before pulling anything apart, the Voltrade GoFIX diagnostic tool can help you work out the likely cause from your symptoms.

Step 2 - Isolate the Water Supply

Close the isolation valves on the supply pipes below the tap by turning the screw slot to the across position. Test by opening the tap - if water runs for a moment then stops, the valve is working. If it keeps flowing, the valve hasn't seated properly and you'll need to go to the mains stopcock instead.

Once isolated, open the tap to release the pressure. Let any remaining water in the line drain out. Then close the tap again - this keeps things drier when you open the internals.

Step 3 - Remove the Tap Handle

Most tap handles have a small decorative cap over the top, hiding the retaining screw. Lever the cap off carefully with a flathead screwdriver - they're usually just clipped on. Undo the screw underneath and lift the handle off. Some handles use a small grub screw on the side of the handle body rather than a top screw - check for this if there's no obvious cap.

If the handle is stuck, resist the urge to force it. Wiggle it gently while pulling upward. A tap handle puller (available from most plumbers' merchants) makes this much easier if you're dealing with a handle that hasn't been moved in years.

Step 4 - Remove the Headgear or Cartridge

For pillar taps: beneath the handle you'll see the headgear - a hexagonal brass nut. Wrap your spanner jaws in cloth to protect the chrome, then undo the headgear nut anti-clockwise. Once removed, you'll see the rubber washer at the bottom, usually held by a small brass nut. That washer is almost always the culprit when a pillar tap drips.

For cartridge taps: once the handle is off, there's typically a retaining clip or threaded collar holding the cartridge in place. Remove this, then pull the cartridge straight up and out. Take a photo on your phone before it comes out - cartridges are directional and need to go back in the same orientation.

Step 5 - Fit the Replacement Part

For pillar taps: undo the small nut at the base of the headgear, remove the old washer, and compare it to a new one. Replacement washers are widely stocked at builders' merchants and hardware shops across Sheffield. Fit the new washer, tighten the nut, and apply a thin coat of silicone grease to the rubber before you reassemble. This helps it seat evenly and extends its life.

For cartridge taps: take the old cartridge to your local merchant and match it up. Common brands in South Yorkshire properties include Bristan, Pegler, and Grohe, and most decent merchants can cross-reference a replacement using the make and model of the tap. Some replacement cartridges come with new O-rings included - if yours doesn't, replace the O-rings separately and grease them before fitting.

Step 6 - Reassemble the Tap

Work backwards through the steps you took to dismantle it. Refit the headgear or cartridge and make sure everything is correctly aligned. Hand-tighten first, then firm it up with the spanner - but don't overtighten. Most internal tap fittings are brass and the threads will strip if you go too hard. Refit the handle, replace the screw, and press the cap back into place.

Step 7 - Restore the Supply and Test

With the tap in the closed position, slowly reopen the isolation valve. Watch underneath the sink carefully as the pressure comes back up. If there's any dripping at the joints, tighten gently. Once the supply is fully restored and nothing is leaking below, open the tap and test the flow. Turn it fully on and off several times, then leave it in the off position and watch the spout for 30 seconds. If it's dry, the job's done.

What to Do If This Does Not Fix It

If the tap is still dripping after a new washer or cartridge, there are a few additional things to check before calling it a day.

The valve seat may be damaged. The valve seat is the metal surface inside the tap body that the washer presses against to stop the flow. In hard water areas - which covers much of South Yorkshire - mineral deposits can cause the seat to pit and corrode over time. Even a new washer won't seal against a rough or pitted seat. You can re-grind the seat using a tap re-seating tool, which typically costs around 10 to 20 pounds. It's a precise job but achievable with patience if you follow the tool instructions carefully.

The leak may be coming from O-rings rather than the main washer. If water is appearing around the base of the spout, around the tap handle, or at the body of the tap rather than dripping from the spout itself, worn O-rings on the spindle or body are the likely cause. These are cheap to replace - just make sure you measure and match the diameter exactly before you buy.

If water is coming from under the sink at a joint or compression fitting rather than from the tap body, that's a separate issue from the tap repair. A loose compression fitting can often be resolved by tightening the nut a quarter-turn with a spanner - but if it's already been tightened repeatedly, it may need to be remade properly.

If you're still struggling to identify exactly where the fault lies, the Voltrade GoFIX diagnostic tool is worth working through - it's designed to help homeowners systematically narrow down plumbing faults before committing to further work.

When to Stop and Call a Professional

Tap repairs are manageable DIY territory most of the time, but there are situations where the sensible move is to call a qualified Sheffield plumber and let them take over.

If the isolation valves won't close, or if there are no isolation valves at all and your mains stopcock is seized, do not try to work around it. Seized stopcocks are particularly common in older South Yorkshire housing stock where the plumbing hasn't been updated in decades. A plumber can replace a faulty stopcock safely - trying to force it risks a burst fitting and a much bigger problem.

If you remove the tap and find corrosion on the pipework itself - green or white deposits on copper pipe, or rust at any fittings - get a professional to assess it. Corroded pipework can fail without much warning, and what looks like a simple tap repair can open up a much wider job once you start disturbing things.

If your property has lead pipework - which is common in pre-1970s Sheffield housing - do not disturb any connections without professional advice first. Lead pipe requires specialist handling and generally needs to be replaced rather than repaired.

Any leak that has already reached behind tiles, inside a wall cavity, or into floor joists needs professional assessment, not a DIY repair. The visible leak is rarely the whole problem in those cases. The cost of bringing in a plumber - typically between 60 and 100 pounds for a call-out plus around 50 to 80 pounds per hour for labour in the Sheffield area - is a fraction of the remediation cost if things go further wrong.

Questions About This Process

How do I know if my tap uses a rubber washer or a ceramic cartridge?

The most reliable way to tell is how the tap operates. If it takes several full rotations to open and close completely, it almost certainly uses a rubber washer on a threaded spindle - the classic mechanism found in traditional pillar taps. If it opens and closes with a quarter-turn of the handle, it uses a ceramic disc cartridge. Mixer taps with a single lever also use cartridges. If you remove the handle and are still not sure, take a photo before dismantling further and search the tap brand and model number for the parts diagram.

Can I repair a leaking tap without turning off the mains water supply?

Yes, in most cases - if the under-sink isolation valves are present and working properly, you can isolate just the tap you're working on without touching the main stopcock. However, older isolation valves sometimes fail to close fully, particularly if they haven't been turned in years. Always test the valve first by opening the tap after closing it, and confirm the water has stopped completely before you dismantle anything. Have the mains stopcock location identified and accessible as a backup before you begin any plumbing work.

How much does a plumber typically charge to fix a leaking tap in Sheffield?

Most plumbers in the Sheffield area charge a call-out fee of around 60 to 100 pounds, plus labour at roughly 50 to 80 pounds per hour. A simple tap washer replacement typically takes 30 to 45 minutes on site, so the total cost commonly falls somewhere between 80 and 140 pounds including parts. Cartridge replacements on mixer taps may come to a little more depending on the cost of the cartridge itself. It's worth getting two or three quotes from local South Yorkshire plumbers for anything beyond a basic repair.