The most common plumbing problems in UK homes are dripping taps, blocked drains, low water pressure, running toilets, and leaking pipes or joints. Some are quick jobs you can safely tackle yourself — plunging a slow drain, cleaning a limescale-clogged tap aerator, or replacing a worn tap washer — while others, like a hidden leak, a burst pipe, or no hot water, need a professional. In hard-water areas like West London, limescale is behind a surprising amount of it, from low pressure to worn tap valves. The golden rule: if a problem risks flooding, or it involves your gas boiler, turn the water off at your stopcock and call a qualified engineer rather than chance it. We handle plumbing and emergency plumbing across West and North West London — Gas Safe registered (657972), tidy, and straight-talking.
Most household plumbing trouble falls into a handful of familiar problems. Below we run through each one: what causes it, whether it’s safe to fix yourself, and the point at which it’s worth calling an engineer. We’ve also pulled it all together in a quick reference table near the end.
How London’s hard water causes plumbing problems
London sits on chalk, which makes its water “very hard” — around 293 parts per million of calcium carbonate. That dissolved mineral becomes limescale, and a typical four-person London household can build up as much as 70kg of it a year. Limescale is the hidden culprit behind a lot of West London plumbing complaints: it clogs tap aerators and shower heads (causing low pressure), furs up valves and washers (causing drips), and coats heating elements and pipework. It’s why the same problems crop up again and again in homes from Kensington to Wembley.
| Fact | Figure | Source |
|---|---|---|
| London water hardness | ~293 ppm calcium carbonate (“very hard”) | UK water-hardness data |
| Limescale per 4-person home | up to ~70 kg per year | UK hard-water guides |
| A tap dripping once a second | wastes 1,400+ litres a year | Waterwise / leak-detection data |
| UK dripping taps combined | ~460 million litres wasted a year | Direct Line |
These are general UK figures for context — verify current data before relying on them.
Dripping taps
A dripping tap is usually caused by a worn washer, a perished O-ring, or a furred-up cartridge — and in hard-water London, limescale speeds all three up. It’s not just annoying: a tap dripping once a second wastes well over 1,400 litres a year. Most drips are a safe DIY fix: turn off the water at the isolation valve under the basin (or the main stopcock), unscrew the tap, and replace the washer or cartridge. If the tap body is corroded, the drip returns, or you can’t isolate the supply, call a plumber.
Blocked drains
Blocked drains are the single most common plumbing complaint, and often the easiest to clear yourself. Start with a plunger: get a firm seal and pump steadily for 20–30 seconds, repeating a few times. For a sluggish kitchen drain, half a cup of bicarbonate of soda followed by white vinegar, left 15 minutes and flushed with hot water, often does it. What we’d avoid is repeated use of harsh chemical drain cleaners — they damage older pipework. If the blockage keeps returning, affects more than one drain, or smells of sewage, that points to something deeper that needs a professional.
Low water pressure
Low pressure across the home is frequently down to limescale — in hard-water areas it clogs tap aerators and shower heads, throttling the flow. The easy win is to unscrew the aerator from the end of the tap, soak it in white vinegar to dissolve the scale, and refit it; the same works for a shower head. If pressure is low everywhere, check the main stopcock is fully open. Persistently low pressure across the whole house can point to a mains issue or a hidden leak, which is worth having investigated.
Running or leaking toilet
A toilet that won’t stop running is usually a worn flush valve (flapper) or a misadjusted float in the cistern — it’s a common fix and a quiet water-waster. Lifting the lid and adjusting or replacing the float or flush valve is manageable for many homeowners with an off-the-shelf part. If water is leaking from the base of the toilet, the pan seal or connection may have failed, and that’s worth getting a plumber to sort before it damages the floor.
Leaking pipes and joints
Leaks tend to show up at compression joints under the sink, or on older pipework — and West London’s period homes often have ageing or imperial-sized pipes that need care. For a minor drip at a visible joint, turn off the water and tighten the fitting gently; catch any water in a bowl. But a hidden leak (damp patches, unexplained water-meter movement, a musty smell) or a leak you can’t reach or stop needs a professional quickly, before it causes real damage. When in doubt, turn off the stopcock and call us.
No hot water
No hot water usually points to the boiler or heating system rather than the plumbing itself — a fault with the boiler, a stuck diverter valve, low pressure, or an airlock. This is not a DIY job: it often involves the gas boiler, which only a Gas Safe registered engineer should touch. If you’ve checked the obvious (power on, boiler pressure in the green, thermostat up) and still have no hot water, it’s time for boiler repairs.
Frozen or burst pipes
In a cold snap, water in exposed or poorly insulated pipes can freeze, expand, and burst — one of the most damaging plumbing emergencies there is. Prevention is best: lag exposed pipes and keep the heating ticking over in very cold weather. If a pipe bursts, turn off the water at your internal stopcock immediately, switch off the electrics near any leak, catch what you can, and call an emergency plumber straight away. This is never a wait-and-see situation.
Can you fix it yourself, or call a plumber?
As a rule of thumb, simple, contained jobs with the water safely isolated are fine to try; anything involving gas, hidden leaks, flooding risk, or a problem that keeps coming back is one for a professional. Here’s the quick reference:
| Problem | Safe to DIY? | Quick fix | Call a plumber if… |
|---|---|---|---|
| Dripping tap | Usually | Isolate water, replace washer/cartridge | Tap is corroded or the drip returns |
| Blocked drain | Usually | Plunger; bicarb + vinegar; hot water | Repeated, multiple drains, or sewage smell |
| Low water pressure | Often | Descale the aerator/shower head; check stopcock | Low across the whole house, or a suspected leak |
| Running toilet | Sometimes | Adjust/replace float or flush valve | Leaking from the base, or fix doesn’t hold |
| Leaking joint | Sometimes | Isolate water, gently tighten the fitting | Hidden leak, damp patches, or can’t stop it |
| No hot water | No | Check power, pressure, thermostat | Anything boiler/gas-related — always |
| Burst pipe | No (emergency) | Stopcock off, electrics off near leak | Always — call immediately |
If a job lands in the “call a plumber” column, we’ll give you a free, no-obligation fixed quote — see plumbing services for everyday jobs or emergency plumbing when it can’t wait.
Frequently asked questions
What are the most common plumbing problems in the home?
Dripping taps, blocked drains, low water pressure, running toilets and leaking pipes or joints are the most common. Many are quick fixes you can safely do yourself; others, like hidden leaks or no hot water, need a professional.
Can I fix a dripping tap myself?
Often, yes. Turn off the water at the isolation valve or stopcock, then replace the worn washer or cartridge. If the tap body is corroded, you can’t isolate the supply, or the drip comes back, it’s worth calling a plumber.
Why is my water pressure low?
In hard-water areas like London, limescale clogging the tap aerator or shower head is a common cause — descaling it usually helps. Low pressure across the whole house can mean a partly closed stopcock, a mains issue, or a hidden leak.
How do I unblock a drain without chemicals?
Use a plunger for 20–30 seconds with a firm seal, or pour bicarbonate of soda then white vinegar down the drain, leave it 15 minutes, and flush with hot water. Repeated blockages need a professional, not stronger chemicals.
What should I do if a pipe bursts?
Turn off the water at your internal stopcock immediately, then switch off the electrics near any leak and catch water in a bucket. Call an emergency plumber straight away — a burst pipe can cause serious damage fast.
When should I call a plumber instead of doing it myself?
Call a professional for burst pipes, hidden or persistent leaks, no hot water, sewage smells, or anything involving your gas boiler. These carry a real risk of damage or danger and need a qualified engineer.
Do you cover emergency plumbing in West London?
Yes — we cover plumbing and emergency plumbing across West and North West London. Our line is answered 24/7 and we’ll take your details and get them to an engineer.
Got a plumbing problem you’d rather hand over?
Some jobs are a five-minute fix; others are best left to someone who does them every day. If you’d rather not chance it, we’re here.
- WhatsApp us — Book in 60 seconds
- Call 020 8051 2124 — our line is answered 24/7 and we’ll get your details to an engineer
- Everyday jobs: plumbing services · Can’t wait? emergency plumbing
We’re Gas Safe registered (657972) and look after homes across West and North West London — from Acton and Chiswick to Kilburn, Willesden and beyond. Heating and plumbing that just works, no drama.
Related reading
- Plumbing services in West London
- Emergency plumbing
- Boiler repairs
- How often should you service your boiler?
- Areas we cover
Figures in this guide are general UK 2026 data for context, not a quote, drawn from sources including Direct Line, AXA and UK water-hardness data. Verify current figures before relying on them.
