Leaking Tap Repair in Dorking - Myths Every Homeowner Needs to Stop Believing

Published July 2026 | Leaking Tap Repair Guide

Most people think a dripping tap is a quick fix - grab a new washer from the hardware shop, tighten a few things, and you're sorted. That assumption is wrong more often than not, and acting on it can make a problem significantly worse. Our engineers in Dorking deal with the consequences of these myths every single week, and it's time to set the record straight.

Myth: A Dripping Tap Is Just a Minor Annoyance That Can Wait

The reality

A slow drip feels trivial. It isn't. A tap dripping at just one drop per second wastes in the region of 15 litres of water per day - that's over 5,000 litres a year from a single tap. Multiply that across a household with two or three leaking taps and you're looking at a meaningful addition to your water bill, particularly if you're on a meter.

Beyond the water waste, slow leaks create cumulative damage that's easy to overlook. Water pooling around a tap base, seeping behind a sink surround, or running down internal pipework can cause mould growth, rot to wooden vanity units and kitchen cabinets, and in worst cases, structural damage to walls and flooring. Our engineers in Surrey regularly attend callouts where what started as a minor drip has turned into a damp wall requiring treatment before any plumbing work can even begin.

There's also the issue of pressure. A leaking tap can sometimes indicate a problem with the internal valve or cartridge that's under pressure. Ignoring it doesn't freeze the problem in place - it often accelerates deterioration. What might cost 80 to 120 pounds to fix today could become a 300 to 500 pound job if the valve seat is allowed to corrode further or the cartridge fails entirely.

Myth: Tightening the Tap Handle Will Stop the Leak

The reality

This is one of the most common things our engineers see. A homeowner notices a drip, grabs the handle and forces it shut as hard as they can. The drip stops temporarily. Problem solved? Not even close.

Overtightening a tap handle puts enormous stress on the washer, the valve seat, and the spindle. In older compression-style taps - which are still extremely common in Dorking properties built before the 1990s - this damages the rubber washer faster and can score the brass valve seat below it. Once the seat is scored, simply replacing the washer won't fix the leak. You'll need to resurface or replace the seat itself, which adds to the repair cost and complexity.

In modern ceramic disc taps, overtightening is even more damaging. Ceramic cartridges are precision-engineered components. They're not designed to be "forced" shut. Applying excessive force can crack the disc, at which point the entire cartridge needs replacing. A cartridge for a mid-range tap typically costs between 15 and 50 pounds for the part alone, depending on the brand and model. That's before labour.

The takeaway: if a tap is dripping when fully closed, tightening it harder is not the solution. It's making the eventual repair more expensive.

Myth: You Just Need a New Washer and It's a Simple DIY Job

The reality

The "just replace the washer" advice has been passed down for generations, and for traditional compression taps, it's not entirely wrong - the washer is often the culprit. But the execution is where things go sideways for most people.

To replace a tap washer properly, you need to isolate the water supply to that tap, remove the tap head, extract the packing nut, withdraw the spindle, and replace the washer on the end. If your property doesn't have individual isolator valves under the sink - which is common in older Surrey homes - you'll need to shut off the water at the mains stopcock and drain the system before you can start. That's a more involved process than most DIY guides acknowledge.

Then there's the question of the valve seat. If the leak has been present for some time, the brass seat the washer presses against is likely pitted or scored. A new washer against a damaged seat will not form a watertight seal - the tap will continue to drip. Diagnosing this requires actually inspecting the seat with a torch, which most homeowners skip. Our engineers use a process similar to what Voltrade's GoFIX diagnostic approach recommends - identify the root cause before replacing any parts - because fitting a new washer to a corroded seat is simply wasting the part.

For ceramic disc taps, cartridge taps, and thermostatic bar mixer taps - which are now standard in most modern Dorking homes - the repair process is entirely different. There's no washer involved. The fault typically lies with a ceramic disc cartridge, an O-ring, or a flow restrictor. Attempting to fix these with compression tap logic won't get you anywhere.

If you're confident with DIY, comfortable isolating your water supply, and you've correctly identified the tap type and fault, a washer or cartridge replacement is achievable. If any of those conditions aren't met, calling a plumber is the more economical option.

Myth: A Leaking Tap Always Means You Need a Whole New Tap

The reality

At the other end of the scale, some homeowners assume a leaking tap is beyond saving and move straight to replacement. In most cases, that's not necessary - and it significantly inflates the cost of the repair.

The majority of tap leaks fall into a small number of categories: worn washers, failed ceramic cartridges, degraded O-rings, or a damaged valve seat. All of these are repairable in situ. A washer replacement typically takes 30 to 60 minutes and costs between 60 and 100 pounds for a standard callout including parts. Cartridge replacement on a modern mixer tap is often similarly priced, with cartridges from reputable brands like Bristan, Grohe, or Hansgrohe available from plumbers' merchants or online.

Replacement does make sense in specific situations. If the tap body itself is cracked, if the tap is very old and parts are no longer available, if repeated repairs on the same unit keep failing, or if the homeowner simply wants to upgrade, then fitting a new tap is the right call. New tap supply and fit in the Surrey area typically costs between 120 and 250 pounds depending on the tap specification and the complexity of the installation. A premium designer tap will obviously cost more in terms of the fixture itself.

The point is that replacement should be a considered decision, not a default assumption. A good plumber will always tell you honestly whether a repair is viable before suggesting a replacement.

Myth: All Tap Leaks Come from the Spout - the Drip Is the Only Problem to Fix

The reality

Homeowners tend to focus on the visible drip from the spout. But taps leak in multiple locations, and some of the less obvious ones cause more damage than the classic spout drip.

Leaks from the base of the tap spout (where the swivel joint is on a kitchen mixer) are commonly caused by worn O-rings on the swivel body. These leaks often pool silently under the tap on the worktop surface, soaking into the chipboard substrate of kitchen units. By the time the damage becomes visible - swollen cabinet doors, soft worktop edges - the structural damage is already done.

Leaks from the back of the tap where it meets the wall are a different problem again, often related to the supply pipe connections rather than the tap itself. Our Dorking engineers frequently find that what looks like a tap leak is actually a poorly sealed compression fitting or a failing olive on the supply line.

Leaks from around the spindle - the shaft the handle turns on - indicate a failing gland packing or O-ring in that area. Water appears around the base of the handle rather than from the spout. This is a distinct repair from a washer or cartridge job.

Diagnosing which type of leak you're dealing with before starting any work is essential. Running your hand around the full tap body and checking the supply pipes underneath - with good lighting - takes five minutes and tells you a great deal about where the fault actually is.

What Actually Matters - Expert Advice for Getting a Tap Leak Fixed Properly

Before calling a plumber or reaching for the toolbox, work through a basic diagnosis. Identify where exactly the water is coming from - the spout, the base of the spout, around the handle, or from below the sink. Turn the tap through its full range and note whether the leak changes. Check whether it's a hot tap, cold tap, or mixer, and whether the supply is from a combi boiler system (mains pressure) or an older gravity-fed system (tank in the loft). This information saves time and means a plumber can arrive with the right parts.

If you're in a period property in Dorking or the wider Surrey area, be aware that older homes often have unusual tap fittings - quarter-turn taps, non-standard thread sizes, or taps fitted to older BSP (British Standard Pipe) plumbing that requires different parts than modern equivalents. It's worth mentioning the age of your property when booking a plumber so they can prepare accordingly.

For landlords in Dorking managing rental properties, address tap leaks promptly. Under the Landlord and Tenant Act 1985, you're responsible for maintaining the water supply installations in good repair. A documented, unaddressed leak can create liability if it leads to further property damage.

On costs: a basic tap repair - washer or cartridge replacement on a standard tap - typically costs between 60 and 130 pounds including parts and a standard callout in the Surrey area. If a valve seat needs reseating, budget for 100 to 180 pounds. Full tap replacement, including the new fixture at mid-range spec, typically runs from 150 to 300 pounds all in. Emergency or out-of-hours callouts will add to these figures.

Finally, use a reputable, qualified plumber. While tap repairs don't legally require Gas Safe registration the way boiler work does, using an unqualified tradesperson for any plumbing work carries risk. Check for membership of bodies like the Chartered Institute of Plumbing and Heating Engineering (CIPHE) or registration with WaterSafe, which is the UK's approved contractor scheme for plumbing.

Myth-Busting Questions

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

In some cases, yes - if your tap has an isolator valve on the supply pipe underneath the sink (a small flathead-slot valve in the pipe), you can turn off just that tap's supply without touching the mains. Many modern installations in Dorking have these fitted as standard. If there's no isolator valve, you'll need to turn off at the mains stopcock, which is typically located under the kitchen sink or near the water meter. Never attempt to dismantle a tap without isolating the water supply first.

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

The simplest test: how does the tap operate? If it needs multiple turns from fully open to fully closed, it's a compression tap that uses a rubber washer. If it moves from fully open to fully closed in a quarter turn (90 degrees), it uses a ceramic disc cartridge. Mixer taps with a single lever are almost always ceramic cartridge. Most taps fitted in UK homes from the mid-1990s onwards use ceramic discs rather than washers, particularly in kitchens and bathrooms with contemporary fittings.

Is it worth fixing an old tap or should I just replace it?

If the tap body is in good condition and parts are available, repair is typically the more economical option - especially for quality fixtures. Where replacement makes more sense is when the tap is very old with no available parts, when it's a low-cost tap that has been repaired multiple times, or when the homeowner wants to upgrade the style. A mid-range replacement tap and fitting service in Surrey typically costs 150 to 250 pounds, so weigh that against repair costs before deciding.

Frequently Asked Questions

How much does leaking tap repair cost in Dorking?

A standard tap repair in Dorking - covering washer replacement or cartridge swap on a single tap - typically costs between 60 and 130 pounds including parts and callout. If the valve seat needs attention, or if the job involves a more complex mixer tap or supply pipe repair, costs commonly run from 100 to 200 pounds. Emergency and out-of-hours callouts carry a premium on top of these figures. Getting a fixed-price quote before work starts is always advisable.

How long does a leaking tap repair take?

Most standard tap repairs take between 30 minutes and one hour once a plumber is on site. A straightforward washer or cartridge replacement on an accessible tap with isolator valves in place is typically at the quicker end. Jobs involving older pipework, non-standard fittings, corroded valve seats, or taps without isolator valves take longer - budget for up to two hours in those cases. Replacing a tap entirely usually falls in the one to two hour range depending on access.

Why does my tap still drip after I replaced the washer?

The most common reason a tap continues to drip after a washer replacement is a damaged valve seat - the brass surface the washer presses against. If this surface is pitted, scored, or corroded, even a perfect new washer cannot form a seal against it. The seat needs to be resurfaced using a tap reseating tool, or in some cases replaced entirely. This is a common issue in older Surrey properties where taps have seen decades of use. A plumber can inspect and address the seat as part of the repair.

Do I need to let my landlord know about a leaking tap before getting it fixed?

Yes - if you're renting, you should notify your landlord or letting agent in writing before arranging repairs yourself. Under most standard tenancy agreements, repairs to plumbing fixtures are the landlord's responsibility. Arranging and paying for work yourself without prior agreement can make it difficult to recover the cost. Report the fault in writing, keep a record of the communication, and allow reasonable time for the landlord to arrange a qualified plumber before escalating.