Bathroom Plumbing Problems and Solutions in Alton

Published October 2026 | Bathroom Plumbing

This guide covers the most common bathroom plumbing problems homeowners in Alton deal with, from dripping taps and blocked drains through to running toilets and low water pressure. It's written for anyone who wants to understand what's gone wrong, attempt a safe fix themselves, and know exactly when to stop and bring in a professional.

Before you start - safety first

Bathroom plumbing sits at the intersection of water and electricity, so a few safety steps aren't optional. Before you touch any pipework or fixtures, shut off the water supply to the affected fitting. There's usually an isolation valve on the supply pipes beneath the basin or behind the toilet cistern - turn it a quarter turn with a flathead screwdriver until the slot sits perpendicular to the pipe. If you can't find one, you'll need to turn off the household stopcock, which is typically located under the kitchen sink.

Never work on pipework while water is still flowing under pressure. Mop up any standing water before you begin. If you spot any signs of water near electrical sockets, light switches, or ceiling roses below the bathroom, stop immediately and call a qualified electrician before proceeding. Don't assume the electrics are safe just because nothing has tripped on the consumer unit.

What you will need

The tools and materials you need depend on the specific fault, but for the most common bathroom plumbing jobs, gather these before you start so you're not hunting for things mid-repair.

Tools:

• Adjustable spanner and a set of basin spanners (essential for reaching into tight spaces under sinks)
• Flathead and cross-head screwdrivers
• Pipe wrench or slip-joint pliers
• Plunger (a cup plunger for sinks and baths, a flange plunger for toilets)
• Drain snake or flexible drain rod set
• PTFE tape (also called plumber's tape)
• Bucket and old towels

Materials:

• Replacement tap washers and O-rings in a range of sizes
• A spare tap cartridge if you have ceramic disc taps (check the brand before buying - cartridges are model-specific)
• A replacement toilet flapper and fill valve (inexpensive and worth having on hand)
• White vinegar for dissolving limescale

Time estimate: A dripping tap typically takes 30 to 60 minutes once you've done it before, longer on your first attempt. Clearing a blocked drain commonly takes 20 to 45 minutes. A running toilet fix can take anywhere from 30 to 90 minutes depending on the fault. If you're approaching two hours with no resolution, that's a useful signal in itself.

Step-by-step instructions

Bathroom plumbing problems cluster around a handful of common faults. Work through these steps in order - they move from the simplest diagnosis to progressively more involved repairs.

Step 1 - Identify the problem accurately

Don't start pulling things apart until you know what you're dealing with. Our engineers use the Voltrade GoFIX diagnostic tool to categorise faults before any work begins, and the same logic applies to a DIY approach. Is the tap dripping when fully closed? Is the toilet running continuously after flushing? Is water draining slowly from the basin or bath? Is there a visible drip under the sink? Pin down the single fault first. It's common to find two problems at once, and fixing the wrong one wastes time and effort.

Step 2 - Shut off the water supply and drain the system

Once you know what you're fixing, isolate the water supply to that fixture. Turn the isolation valve to the off position (slot perpendicular to the pipe). Then flush the toilet once or open the tap fully to drain off residual water held in the pipe. Have your bucket and towels in place - there will always be some water left in the pipework once you open it, and it needs somewhere to go that isn't your bathroom floor.

Step 3 - Fix a dripping tap

A dripping tap is typically caused by a worn washer or a failed cartridge. For traditional pillar taps, remove the decorative cap on top of the tap head (it often pops off or unscrews), then unscrew the grub screw beneath it. Lift the head off and use an adjustable spanner to unscrew the headgear nut. The washer sits at the bottom of the headgear - replace it with one of an identical size. For ceramic disc or cartridge taps, the process involves removing the cartridge itself and either replacing its O-rings or swapping the whole unit. Replacement cartridges typically cost between 5 and 25 pounds depending on the brand.

Wrap any threaded connections with two or three layers of PTFE tape before reassembly, winding in the direction of the thread. Restore the water supply slowly and check for drips before replacing the decorative head.

Step 4 - Clear a blocked or slow drain

Bathroom drains block most commonly from a combination of hair, soap residue, and limescale. Hampshire's water supply carries enough dissolved calcium in many areas to accelerate scale build-up noticeably, particularly in showers. Start by removing the drain cover and pulling out any visible debris by hand - wear rubber gloves for this. Then use a cup plunger with a firm seal over the drain opening, plunging firmly 10 to 15 times.

If that doesn't clear it, feed a drain snake down the pipe, rotating it as you push to break up the blockage rather than just compressing it. Hold off on chemical drain cleaners as a first step - they're corrosive, can damage older plastic waste pipes, and often don't work on solid hair blockages. If the drain is still slow after snaking, the blockage may be further along in the soil stack and beyond what you can reach with DIY tools.

Step 5 - Fix a running or constantly filling toilet

A toilet that runs continuously after flushing, or that fills slowly and then drains into the pan in a cycle, has one of two common causes: a faulty fill valve or a worn flapper (the rubber seal at the base of the cistern that lifts during a flush). Remove the cistern lid and watch what happens after a flush. If water keeps rising past the overflow mark and running into the overflow pipe, the fill valve needs adjustment or replacement. If you can hear water trickling into the pan and the cistern refills repeatedly in a slow cycle, the flapper is almost certainly the culprit.

Flappers typically cost between 5 and 15 pounds and clip off and on without any tools. Fill valves are slightly more involved but commonly cost between 10 and 30 pounds and come with fitting instructions. Shut off the water supply, flush to empty the cistern, disconnect the supply pipe from the base of the cistern (cloth underneath), and swap out the faulty component.

Step 6 - Address low water pressure in the bathroom

Low pressure from a bathroom tap or shower is commonly caused by one of three things: a partially closed isolation valve, a blocked aerator on the tap spout, or a pressure issue further back in the supply. Check the isolation valve first - it should be fully open with the slot parallel to the pipe. If pressure is low at every outlet in the property, the issue may be with the stopcock, the water meter, or the incoming supply from the main, which would require your water company to investigate.

For showers specifically, a clogged shower head filter is a very common cause of reduced flow. Unscrew the shower head, remove the filter plate, and soak it in white vinegar for two to three hours to dissolve accumulated limescale. Given Hampshire's water hardness, a shower head filter can block noticeably within 12 to 18 months if it isn't cleaned periodically.

Step 7 - Check for and repair minor leaks under the basin

Run the tap at full flow and watch the waste pipe connections, the trap (the curved section that holds water to block drain gases), and the supply pipes for any drips. Plastic waste pipe fittings can work loose over time, particularly if the pipe has experienced any movement. Hand-tighten any loose push-fit connections first. If there's a drip from a compression fitting on a copper supply pipe, try tightening the compression nut a quarter turn with a spanner - no more, or you risk deforming the olive inside and making the leak worse. If the trap itself is leaking from a joint, replacing it commonly costs between 10 and 20 pounds and involves unscrewing the slip-nut connections by hand.

What to do if this does not fix it

If you've worked through the relevant steps and the problem persists, the fault is likely deeper in the system. A drain that won't clear after snaking may have a partial collapse or a significant build-up further along the soil stack - this needs a CCTV drain survey to diagnose properly. A tap that starts dripping again within days of a washer replacement may have a scored valve seat, which requires a valve seat grinder to repair rather than just a new washer.

A toilet that keeps running despite a new flapper and fill valve may have a cracked siphon unit or a hairline crack in the cistern base. These are faults you can't fix with standard DIY parts, and attempting to work around them tends to lead to more expense down the line. In these cases, calling a plumber in Alton is the right next move.

When to stop and call a professional

Some situations require a qualified plumber rather than a DIY attempt. Stop work and call a professional if any of the following apply:

• You find evidence of water damage inside walls or beneath floors - discolouration, softness to the touch, a musty smell, or bubbling paintwork. This suggests a concealed leak that needs proper assessment before more damage occurs.
• Any pipework you've opened is showing signs of corrosion, pinholing, or looks brittle. Old lead or iron pipework particularly needs a qualified eye before you disturb it further.
• You can't locate or close an isolation valve and the water won't stop running - turn off the stopcock and call immediately.
• The fault involves the hot water cylinder, the boiler, or any pressurised hot water system. Unvented cylinders operate under mains pressure and require a qualified engineer with the appropriate certification to work on them safely.
• The problem comes back within a few days of a fix - that typically means the underlying cause hasn't been addressed.

A plumber serving Alton and the surrounding Hampshire area will typically charge between 60 and 100 pounds per hour for call-out work, with most standard bathroom faults resolved within one to two hours. Experienced local plumbers with NVQ-level qualifications bring both the technical training and the specialist tools for jobs that have moved beyond basic DIY repair. The bathroom is one of the highest-priority rooms in the house when something goes wrong, so it's worth getting a proper fix rather than a temporary workaround.

Questions about this process

How do I know if my bathroom leak is serious enough to call a plumber in Alton?

If a leak has caused any visible damage to walls, floors, or the ceiling below - or if it's coming from behind tiles or inside a wall void - call a plumber without delay. A slow concealed leak can cause significant structural damage and mould growth over several weeks. Surface drips from accessible fittings beneath a basin are typically manageable as a DIY repair, but anything inside the fabric of the room warrants professional investigation rather than guesswork.

Why does my bathroom drain keep blocking even after I clear it?

Recurring blockages in Alton and across Hampshire are often down to a combination of hard water scale and hair that accumulates faster than occasional clearing can manage. Fitting a hair-catch drain cover over the plughole helps significantly and costs very little. If blockages keep returning despite that, the issue may be a partial collapse or misalignment in the waste pipe further down the run. A drain CCTV survey can locate the fault precisely, and a plumber can then advise whether the pipe needs relining or replacement.

Is it safe to use chemical drain cleaners on bathroom pipes?

Chemical drain cleaners can shift grease-based blockages but they're less effective on the hair-and-soap combination that causes most bathroom drain problems. More importantly, they're corrosive to older plastic and rubber pipe joints, and repeated use can cause deterioration over time. In most cases a plunger followed by a drain snake is safer and more effective. If those don't work, a professional drain clearance is a better option than repeated chemical treatments that may damage the pipework.