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Plumbing in a British home covers the cold water arriving at the stopcock, the hot water and heating pipework, and everything that drains away: taps, cylinders, showers, toilets, washing machine connections, outside taps, soil pipes and blocked drains. Much of the housing stock is old, and the pipework usually tells the story of several decades of alterations by different hands.
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Unlike gas work, plumbing is not a licensed trade. There is no national licence or statutory register you must hold to work as a plumber in the United Kingdom, which surprises people who assume a plumber is vetted the way a gas engineer is. What exists instead is a mix of qualifications, voluntary approved contractor schemes, and legal rules that attach to particular kinds of work: the water fittings regulations, the building regulations, and the strict gas rules that apply the moment a boiler is involved.
That makes the checks you make yourself worth more here. Ask what the plumber is qualified to do, ask who will handle the gas part if the job touches a boiler, get the scope in writing, and agree in advance what happens if the first fix does not hold.
Is plumbing a licensed trade in the UK? What the law actually requires
It is worth being blunt about this, because a great deal of advertising implies otherwise: there is no statutory licence to work as a plumber in the UK. A plumber may be highly qualified and belong to a professional body, or may have neither, and no register stands between the two. The legal requirements attach to the work, not to the job title.
Three legal hooks matter to a household. Gas work is reserved by law to Gas Safe registered engineers, so a plumber who is not registered cannot lawfully work on your boiler. Water fittings work is governed by the Water Supply (Water Fittings) Regulations 1999, which set requirements for fittings and for preventing contamination and backflow, and require notice to the water company before certain installations. And the building regulations cover parts of the same territory: in England, Approved Document G deals with cold water supply, water efficiency, hot water supply and systems, sanitary conveniences and washing facilities, bathrooms, and kitchens.
Voluntary schemes fill the reputation gap. WaterSafe describes itself as a free national directory and accreditation body for qualified plumbers, drawing on approved contractor schemes run by bodies including WIAPS, APHC, CIPHE and SNIPEF, and an approved contractor can carry out some notifiable work without giving the water company prior notice. In England, installers registered with a competent person scheme can also self-certify certain building work instead of going through building control. None of that is a licence, but it is evidence, and evidence is what you are looking for.
How British plumbing is laid out: stopcocks, combi systems, cylinders and loft tanks
- The internal stopcock shuts off the whole house and is usually under the kitchen sink, in a downstairs cloakroom or near where the supply enters; there is also an external stop valve near the boundary, which belongs to the water company.
- A combi system has no cylinder and no tanks: mains water is heated on demand, so the incoming mains pressure is what reaches the shower.
- A system or regular boiler works with a hot water cylinder, usually in an airing cupboard, and a regular system also has a cold water tank and a small feed and expansion tank in the loft.
- Unvented cylinders are pressurised and fall under the building regulations, so they are installed and serviced by someone qualified for that specific work.
- Older houses often contain a mix of pipe materials - lead, steel, copper and plastic - and the joints between them are a common place for leaks to begin.
- Water hardness varies by area and your water company publishes it for your postcode; in hard water areas limescale builds up inside cylinders, heat exchangers, showers and taps.
- Some older properties still have a lead supply pipe; if you think yours might, ask your water company, which can tell you what it holds on record and what it does about replacement.
Burst pipe or a leak you cannot stop: find the stopcock before you need it
The most useful thing you can do before a plumbing emergency is find your internal stopcock, turn it to confirm it actually moves, and make sure everyone in the household knows where it is. The stopcock that has not been turned in twenty years is precisely the one that will not turn on a Sunday night.
If a pipe bursts, close the stopcock, open the cold taps to drain the system down, and switch off the heating and any immersion heater so nothing is heating an emptying cylinder. Keep water away from electrics: if water is anywhere near the consumer unit, sockets or light fittings, treat it as an electrical hazard as well and get an electrician involved. Take photographs before anyone starts stripping out, because your insurer will want to see them.
Cold snaps bring their own version of this. Pipes in lofts, garages and unheated outbuildings freeze first, and the damage usually appears when they thaw rather than when they freeze. Lagging exposed pipework, keeping a little heat on through a freeze, and knowing where the stopcock is are the three things that limit how bad it gets.
Common plumbing problems in UK homes
- Dripping taps and slow-filling cisterns, usually worn washers, cartridges or float valves.
- Limescale narrowing shower hoses, taps and heat exchangers in hard water areas, showing up as weak flow and disappointing hot water.
- Low pressure or poor flow at upstairs taps, which can be the incoming supply, a partly closed stopcock, or a system that depends on a loft tank.
- Blocked sinks, baths and toilets from fat, wipes and hair, and blocked external gullies and soil pipes after heavy rain.
- Leaks under baths and behind tiling, which often show first as a stain on the ceiling below rather than in the bathroom.
- Noisy pipes and water hammer when a tap or an appliance valve shuts quickly.
- Cylinders and radiators that never get properly hot because the system is full of sludge.
Hot water temperature, legionella duties and the checks that prevent big bills
Hot water temperature is a safety matter rather than a comfort setting. The Health and Safety Executive's guidance for landlords on legionella sets out simple, proportionate controls for domestic systems, including storing water in hot water cylinders at 60°C, flushing through systems before a property is let, removing redundant pipework and cleaning showerheads. It is also clear that health and safety law does not require a landlord to obtain or produce a legionella test certificate, and that most small domestic properties do not need an in-depth assessment. That is worth knowing if somebody tries to sell you one.
Alongside that, a short annual round of checks is enough for most homes: turn the stopcock and any isolating valves so they do not seize, look under sinks and behind the washing machine for damp patches, check whether the overflow or the discharge pipe outside is dripping, and clear the gullies and gutters before winter. Most of the expensive jobs a plumber attends started as something small that nobody looked at.
Plumbing work you must tell your water company about first
The Water Supply (Water Fittings) Regulations 1999 require notice to the water undertaker before certain installations, and the list catches more household projects than people expect. The water company cannot unreasonably withhold consent and has ten working days to respond. There is a practical exception: an approved contractor can carry out some of this work without prior notification and certify it instead, which is one concrete reason to use a plumber on an approved contractor scheme.
- A bath with a capacity of more than 230 litres.
- A bidet with an ascending spray or a flexible hose.
- A pump or booster drawing more than 12 litres a minute.
- A reverse osmosis unit or certain water treatment units.
- An automatic garden watering system.
- A pond or swimming pool holding more than 10,000 litres that is automatically replenished.
- Underground pipework laid outside the standard depths, and the erection of a building or an extension of a water system.
What drives the cost of a plumbing job in a British home
Plumbers price access as much as the work itself. A visible joint under a sink and an identical joint under a tiled bathroom floor are the same repair and a completely different job.
- Whether the fault can be reached, or whether floorboards, tiling or a boxed-in duct have to come up first.
- The age and mix of pipe materials, since joining old work to new takes longer than working in one material throughout.
- Whether any part of the job touches gas, which brings a Gas Safe registered engineer into it.
- Whether the work is notifiable under the water fittings regulations or the building regulations.
- Water hardness and scale, which can turn a straightforward cylinder or shower job into a longer one.
- Out-of-hours attendance for an emergency instead of a booked appointment.
- Making good afterwards: plaster, tiling and flooring are often quoted separately or left for you to arrange.
Combi or cylinder: which suits the way your household uses hot water
When a system is being replaced rather than repaired, this is the decision underneath all the others. A combi heats water on demand and frees up the airing cupboard and the loft, which is why it suits smaller homes and flats, but it delivers one flow of hot water at a time, so two showers at once is where it shows its limits.
A cylinder stores hot water, which suits larger households, homes with more than one bathroom, and anyone moving to a heat pump, since heat pumps heat water to a cylinder rather than instantly. The trade-off is the space the cylinder takes and the need to heat a store whether or not it all gets used.
LokalMatch works the same way for a dripping tap as for a bathroom refit: describe the job once, with photos and your postcode, and plumbers covering your area get in touch. The pros pay for the requests they receive. LokalMatch does not do the plumbing, does not set the price, and does not vet, rank or recommend the businesses that reply, so comparing what is actually included in each quotation is down to you.
Plumbers: frequently asked questions
Do plumbers need a licence in the UK?
No. There is no statutory licence or national register you must be on to work as a plumber. Schemes such as WaterSafe, which lists approved plumbing businesses vetted through bodies including WIAPS, APHC, CIPHE and SNIPEF, are voluntary. The legal requirements attach to particular work instead: gas work needs Gas Safe registration, and water fittings and building regulations apply to the installation itself.
Can my plumber work on my gas boiler?
Only if they are Gas Safe registered, and only for the appliance types listed on their ID card. Plenty of plumbers are registered, but the two are separate things: a plumbing qualification does not permit gas work. If a job mixes both, ask at the quotation stage who is doing the gas part.
Where is my stopcock, and what if it will not turn?
The internal stopcock is usually under the kitchen sink, in a downstairs cloakroom, or close to where the supply pipe enters the property. There is also an external stop valve near the boundary. If the internal one will not turn, do not force it in an emergency; have a plumber replace it during a planned visit, which is much cheaper than discovering it during a burst.
Do I have to tell my water company before installing a large bath or a garden watering system?
Yes, both are on the list of installations that require advance notice under the Water Supply (Water Fittings) Regulations 1999, along with items such as a bidet with an ascending spray or hose, a pump drawing more than 12 litres a minute, and a pond or pool over 10,000 litres with automatic replenishment. An approved contractor can carry out some of this work without prior notification and certify it instead.
What temperature should my hot water cylinder be set to?
The Health and Safety Executive's landlord guidance on legionella describes setting hot water cylinders to store water at 60°C as one of the simple control measures for domestic systems, alongside flushing unused systems, removing redundant pipework and cleaning showerheads. Stored water that hot can scald, so it is normally blended down at the outlets rather than stored cooler.
Do I need a legionella certificate for a rented property?
No. The Health and Safety Executive states that health and safety law does not require landlords to obtain or produce a legionella test certificate, and that most small domestic rented properties do not need an in-depth assessment. Landlords do have to assess and control the risk, which for a typical home means the simple measures above rather than paid testing.
Sources
- Water Supply (Water Fittings) Regulations 1999, regulation 5: notification of proposed work
- Water Supply (Water Fittings) Regulations 1999: full contents
- WaterSafe: the national directory of approved plumbers
- HSE: Legionella and landlords' responsibilities
- GOV.UK: Approved Document G - sanitation, hot water safety and water efficiency
- Gas Safety (Installation and Use) Regulations 1998, regulation 3: only approved persons may do gas work
- GOV.UK: Competent person schemes for self-certifying building work
Written by the LokalMatch editorial team. Last reviewed 14 September 2026. How we write and check our guides
What plumbers can help with
Common jobs homeowners hire plumbers for:
- Emergency PlumbersUrgent help for burst pipes, major leaks and backups.
- Plumbing RepairFix leaks, low water pressure and broken fixtures or pipes.
- Plumbing InstallationNew plumbing for renovations, additions and fixture moves.
- Drain CleaningClear slow or blocked drains, from sinks to the main line.
- Blocked DrainsUnblock clogged sinks, tubs, showers, toilets and floor drains.
- Sewer RepairRepair broken or backed-up sewer and drain lines.
- Sewer Line ReplacementReplace a damaged or aging sewer line to the street.
- CCTV Drain SurveysCamera inspection to find blockages, roots or breaks in drains.
- Backwater Valve InstallationInstall a backwater valve to help stop sewer backups.
- Sump Pump InstallationInstall or replace a sump pump, pit and battery backup.
- Sump Pump RepairFix a sump pump that won't run, runs constantly or fails.
- Water Heater InstallationInstall or replace a hot water tank.
- Water Heater RepairFix a leaking water heater or one that gives no hot water.
- Tankless Water HeatersInstall, repair and service tankless water heaters.
- Tap RepairFix dripping faucets or install new ones.
- Toilet RepairFix running, leaking or broken toilets, or install new ones.
- Sink InstallationInstall or replace kitchen, bathroom and laundry sinks.
- Shower PlumbingInstall and repair shower valves, drains and fixtures.
- Bathtub PlumbingInstall bathtubs and repair tub drains and faucets.
- Water Leak DetectionFind hidden leaks in walls, floors and supply lines.
- Pipe RepairRepair or replace burst, leaking or corroded pipes.
- Frozen PipesThaw frozen pipes and repair any damage they cause.
- Water Main RepairRepair or replace the water line coming into your home.
- Water Softener InstallationInstall, replace or service a water softener.
- Water FiltrationInstall whole-home or point-of-use water filters.
- Reverse Osmosis SystemsInstall and service reverse osmosis drinking water systems.
- Well ServicesWell pump repair and installation, and other well work.
- Septic ServicesSeptic system inspections, repairs and general service.
- Septic Tank InstallationInstall or replace a septic tank and leaching bed.
- Septic Tank Cleaning & PumpingPump out and clean septic tanks.
- Water TreatmentTreat well or city water with UV, softening or filtration.
- Water TestingTest well or tap water quality.
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What affects the cost of plumbing
Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:
- Type of problem and how easy it is to find
- Access to pipes behind walls, under floors or underground
- Parts and fixtures chosen
- Age and material of the existing pipes
- Emergency, evening or weekend service
- Permits and inspections, where required
How to compare plumbers before you hire
- Hire a plumber who is licensed for this work in your area, especially for gas water heaters, sewer lines and new plumbing.
- Ask whether they charge a flat rate or by the hour, and what the call-out fee covers.
- For leaks and drain problems, choose someone who explains the cause and doesn't only clear the symptom.
- Get the scope in writing for larger jobs such as a water heater, sewer repair or re-piping.
- If it's urgent, ask how soon they can arrive and whether after-hours rates apply.
Questions to ask plumbers before you hire
- Are you licensed for plumbing work in my area?
- Do you charge a flat rate or by the hour, and is there a call-out fee?
- What do you think is causing the problem?
- Will this work need a permit or an inspection, and who will arrange it?
- Will you need to open walls, floors or the yard to reach the problem?
- What warranty do you offer on parts and labour?
When to call a pro for plumbing
- An active leak: shut off the main water valve if you can reach it safely, then call a plumber.
- Sewage backing up into drains or the basement
- No hot water, or water pooling around the water heater
- Pipes that may have frozen during a cold snap
Plumbing permits and local rules
Some plumbing work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.
Permits and licensingSeasonal maintenance
This job is part of our home maintenance checklists for:
Guides about plumbing
- ✦
Emergency Plumbers guide
Emergency plumbing is the part of the trade that runs on the clock rather than the diary: a burst pipe soaking a ceiling, a leak that will not stop when you close the stopcock, a toilet or soil stack backing up, a hot…
Read guide - ✦
Plumbing Repair guide
Plumbing repair covers the unglamorous middle of the trade: the cistern that refills all night, the compression joint weeping behind a kitchen unit, the radiator valve that will not shut, the shower that has lost its…
Read guide - ✦
Plumbing Installation guide
Plumbing installation is new pipework rather than mended pipework: a bathroom where there was a bedroom, a kitchen moved to the other side of the house, an outside tap, a garden watering system, a second WC under the…
Read guide
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