What Plumbers Do

Most people think plumbers just fix leaks. They do much more than that. From installing new bathroom suites to maintaining heating pipework and preventing catastrophic water damage, plumbers keep your home’s water and waste systems running safely. This guide explains what plumbers actually do, what falls outside their remit, and how to know when you need one. Understanding the difference between trades—plumbers, heating engineers, electricians—saves you time, money, and the hassle of calling the wrong professional. Whether you need routine plumbing work or specialist heating & gas services, knowing who does what matters.

What does a plumber actually do?

A plumber installs, maintains, and repairs water supply systems, waste systems, and certain heating components. They work on everything from kitchen taps to bathroom suites, pipework, drainage, and radiators.

You’ll find plumbers working in homes, flats, and small commercial spaces across London. They handle day-to-day installations, emergency repairs, and preventive maintenance that keeps your property safe from leaks, blockages, and water damage.

There’s some overlap with heating engineers, particularly around radiators and hot-water cylinders. However, the legal scope differs: only Gas Safe registered engineers can work on gas boilers and appliances. Many plumbers hold both qualifications, but if they’re working on your boiler, they must show their Gas Safe card. The Chartered Institute of Plumbing and Heating Engineering (CIPHE) sets professional standards for both trades.

Core plumbing services for London homes

Emergency plumbing

Plumbing emergencies don’t wait for convenient times. Water damage escalates quickly, so emergency services operate 7 days a week to protect your property.

• Burst pipes need immediate attention to stop flooding and prevent structural damage. Emergency plumbers locate the burst, shut off water supplies, and either repair or replace damaged sections on the spot.
• Emergency leak repairs address active leaks before they saturate walls, floors, or ceilings. Fast response limits damage and reduces repair costs dramatically compared to waiting until morning.
• Flood prevention and water shut-off services help when you can’t locate your stopcock or it’s seized solid. Emergency plumbers know where to find shut-off points and can isolate problems quickly whilst water’s gushing.
• Emergency toilet, sink, or bath repairs restore function when fixtures fail completely. Blocked toilets that overflow, sinks that won’t drain, or baths that leak through ceilings all need urgent attention.
• Emergency drain unblocking clears severe blockages causing backups and overflows. Specialist equipment handles blockages that plungers can’t shift, restoring drainage within hours.

Leak detection and repair

Finding hidden leaks saves thousands in damage costs. Modern detection equipment locates problems without destructive investigation.

• Thermal imaging leak detection uses infrared cameras to spot temperature differences caused by water escaping behind walls or under floors. This non-invasive method pinpoints leaks accurately without drilling holes or removing tiles.
• Acoustic leak detection listens for the sound of water escaping under pressure. Specialist microphones detect leaks in underground pipes, under concrete floors, or anywhere sound travels but water isn’t visible.
• Hidden pipework tracing maps pipe routes behind walls so plumbers know exactly where to work when repairs are needed. This prevents accidental damage to other services and minimises disruption.
• Mains water leaks between the boundary and your property waste thousands of litres and undermine foundations. Professional detection locates them quickly, and repairs prevent ongoing damage and high bills.
• Slow leaks in walls, floors, or ceilings cause gradual damage that’s expensive to fix. Early detection catches them before rot sets in or mould becomes a health hazard.
• Bathroom and kitchen leak repairs fix leaks at their source—failed seals, loose connections, or damaged pipes—rather than just dealing with symptoms.

General plumbing repairs

Day-to-day plumbing problems need quick, reliable fixes to keep your home functioning smoothly.

• Tap repairs and replacement fix drips, restore pressure, and replace worn cartridges or ceramic discs. When repairs aren’t cost-effective, replacement with modern efficient taps makes more sense.
• Toilet repairs address running cisterns, weak flushes, leaking bases, and faulty mechanisms. Most problems are fixable without replacing the entire toilet.
• Shower valve repairs restore temperature control and fix drips. Thermostatic valves need specialist knowledge to repair correctly whilst maintaining safety features.
• Water pressure problems get diagnosed properly to distinguish between fixture issues, pipework restrictions, and supply problems. Solutions range from simple aerator cleaning to pressure regulator installation.
• Washing machine plumbing covers installation, leak repairs, and drainage issues. Proper connections prevent flooding and ensure machines drain correctly.
• Dishwasher plumbing includes supply line installation, waste hose positioning, and fixing drainage or filling problems that stop machines working.
• Outdoor tap installation and repair provides convenient water access for gardens and car washing. Frost-proof installations prevent winter damage.
• Stopcock repair or replacement ensures you can shut off water during emergencies. Seized stopcocks get freed or replaced before you desperately need them.

Pipework services

Your pipes are the arteries of your plumbing system. Professional pipework services keep them flowing properly.

• New pipe installations bring water supplies to extensions, loft conversions, or new bathrooms. Correct sizing and routing ensure adequate pressure throughout your home.
• Pipe rerouting moves supplies for renovations or to avoid problem areas. This includes boxing in exposed pipes for better aesthetics.
• Frozen pipe thawing uses specialist equipment to safely thaw ice blockages without bursting pipes. Prevention advice stops recurrence.
• Copper, plastic or PVC pipe repair fixes leaks, replaces corroded sections, and upgrades old materials to modern standards. Material choice depends on location, pressure requirements, and regulations.
• Pipe insulation prevents freezing in cold areas and reduces heat loss from hot-water pipes. Proper insulation pays for itself through lower energy bills.
• Burst pipe replacements restore water supply after winter damage or aged pipe failures. Emergency replacements use durable materials that prevent recurrence.

Bathroom plumbing

Bathrooms contain your home’s most complex plumbing. Professional installation and repairs ensure everything works reliably.

• Full bathroom installation handles all plumbing for new bathrooms—supply pipes, waste pipes, fixture connections, and testing. This includes moving soil stacks if layouts require it.
• Shower installation covers everything from simple shower heads to complete enclosures with thermostatic controls, body jets, and digital temperature displays.
• Bath replacement involves disconnecting old baths, modifying pipework if needed, installing new baths, and connecting waste and overflow systems properly.
• Wet room plumbing requires specialist knowledge of waterproofing, drainage gradients, and building regulations. Poor installation causes catastrophic leaks to rooms below.
• Saniflo installation and repair enables bathrooms in locations without gravity drainage. These macerator systems need correct installation and periodic maintenance to work reliably.
• Vanity units, basins and tap fitting combines plumbing skills with carpentry to create functional, attractive bathroom furniture with hidden pipework.
• Bathroom refurbishments upgrade tired bathrooms with modern fixtures whilst improving plumbing efficiency and reliability behind the scenes.

Kitchen plumbing

Kitchens demand reliable plumbing for daily cooking, cleaning, and appliance operation.

• Sink installation includes mounting, waste kit assembly, tap connection, and ensuring proper drainage gradients. Double sinks need careful waste pipe routing to prevent blockages.
• Garbage disposal units require specialist installation with correct electrical connections, adequate waste pipe sizing, and proper venting to prevent drainage issues.
• Water filtration systems install under sinks to improve drinking water quality. Options range from simple carbon filters to reverse osmosis systems needing waste connections.
• Fridge or freezer water line installation provides filtered water and ice-making capability. Proper installation prevents leaks and maintains water quality through inline filters.
• Kitchen tap installation fits modern mixer taps, boiling water taps, or filtered water taps with all necessary supply connections and shut-off valves.

Water supply and pressure services

Adequate water supply and pressure are essential for modern homes. Professional services diagnose and fix supply problems.

• Mains water installation connects new builds or extensions to street supplies, including liaison with water companies for legal connections meeting regulations.
• Water softener installation protects plumbing and appliances in hard-water areas. Correct installation ensures effective operation whilst maintaining drinking water supplies separately.
• Booster pump installation increases pressure in properties with weak supply or multiple storeys. Pumps need correct sizing and pressure switches to operate safely.
• Low pressure diagnostics identify why pressure is weak—blocked aerators, partially closed valves, undersized pipes, or supply problems. Solutions target the actual cause rather than symptoms.
• Water tank repair or cleaning maintains cold-water storage tanks, replacing failed components and removing sediment that affects water quality.
• Cold water storage tank replacement upgrades old tanks that are undersized, corroded, or lacking proper covers and insulation required by current regulations.

Hot water systems

Reliable hot water is essential for comfort and hygiene. Professional services cover all hot-water system types.

• Hot water cylinder installation and repair handles both modern and traditional cylinders, including all necessary pipework, controls, and safety devices.
• Vented and unvented cylinder services cover both system types. Unvented cylinders need G3 qualified installers for legal compliance and safety.
• Immersion heater repair or replacement restores hot water when elements fail. Includes thermostat replacement and upgrading to more efficient heating elements.
• Megaflo installation and service provides high-pressure hot water throughout your home. These unvented systems need annual servicing by qualified engineers to maintain safety certification.
• Thermal store systems combine heating and hot-water provision efficiently. Installation requires understanding of both heating and plumbing systems.
• Combi boiler troubleshooting diagnoses pressure problems, temperature fluctuations, and delivery issues affecting hot-water performance throughout your home.

Emergency vs. scheduled plumbing

Emergency plumbers respond fast when water’s flooding your kitchen or a pipe bursts in the middle of the night. You’re paying for speed and availability outside normal hours.

Routine maintenance costs less and prevents emergencies. Annual checks catch small problems—worn washers, corroding joints, slow leaks—before they turn into expensive disasters. The Water Regulations Advisory Scheme (WRAS) recommends regular plumbing inspections for property owners and landlords.

What plumbers don’t do

Plumbers are skilled professionals, but they’re not qualified for every job. Here’s what falls outside their scope:

• Electrical rewiring or appliance electrics. Connecting an electric shower, wiring a boiler, or installing heating controls requires a certified electrician. Plumbers can’t legally do electrical work unless they’re also qualified electricians.
• Gas boiler servicing or installation. Unless your plumber is Gas Safe registered, they can’t touch gas appliances. Boiler internals, gas connections, and flue work are strictly for Gas Safe engineers.
• Major roof or structural repairs. Leaking roofs need roofers. Structural damage needs builders or surveyors. Plumbers fix the plumbing consequences (water damage, damp), not the building fabric.
• Large drainage excavation. If your main sewer line collapses or needs replacing, specialist drainage contractors with excavation equipment handle it. Plumbers deal with internal waste pipes and smaller external drains.

Calling the right qualified trade first saves time, money, and hassle. Nobody wants to pay a plumber’s callout fee only to hear “sorry, you need an electrician.”

Who to call: plumber vs heating engineer vs electrician

Many heating engineers are also qualified plumbers, so they can handle both heating and water systems. Check their credentials before booking: Gas Safe registration is legally required for gas work, whilst plumbing and electrical work need respective qualifications.

Not sure who you need? Describe the problem. Water leaking from pipes or taps? Plumber. Boiler not firing up? Heating engineer. Electric shower not working? Electrician. A reputable company will tell you who’s right for the job.

Qualifications and safety standards

Qualified plumbers typically hold City & Guilds or NVQ Level 2 or 3 in Plumbing. These courses cover water regulations, pipe fitting, drainage, and safety standards.

If they’re working on gas appliances or boilers, they must be Gas Safe registered. This legal requirement protects you from dangerous gas work. Always ask to see their Gas Safe card—it lists what appliances and work they’re qualified to do.

For landlords and property owners in London, using qualified tradespeople isn’t optional. It’s part of legal compliance, insurance requirements, and duty of care to tenants. Qeeper’s engineers hold all necessary certifications, so you know the work meets UK standards and regulations.

When to call a professional plumber

Don’t wait for small problems to become big ones. Call a plumber when you notice:

• Persistent leaks from taps, pipes, or toilets
• Low water pressure throughout the property
• Signs of damp, mould, or water stains
• Slow-draining sinks or gurgling pipes
• Unsafe or inconsistent hot-water supply
• Visible corrosion on pipes or fittings

Proactive maintenance checks catch issues early. An annual plumbing inspection costs far less than emergency repairs after a pipe bursts. Book routine plumbing services to keep your system in good shape and avoid nasty surprises.

How plumbers help protect your property long-term

Regular plumbing servicing keeps your water and heating systems efficient. Well-maintained pipes don’t spring leaks. Clean drains don’t block. Properly fitted appliances don’t flood your kitchen.

You’ll also avoid major expenses. Replacing an entire section of pipework because corrosion spread costs thousands. Catching it early during a routine check costs hundreds.

For landlords, reliable plumbing adds property value and keeps tenants happy. Nobody wants to rent a flat with dodgy showers and persistent damp. The Energy Saving Trust notes that well-maintained water and heating systems improve energy efficiency ratings, which matters for rental compliance and property valuations.

Prevention beats repair every time. A good plumber spots problems before they damage your home.

Keep your plumbing working properly

Plumbers keep your water and heating systems safe, efficient, and reliable. They do far more than fix the occasional dripping tap—they install new systems, prevent major damage, and maintain the infrastructure your home depends on daily.

Knowing what plumbers do (and don’t do) helps you make smart, timely decisions about maintenance and repairs. Don’t wait for an emergency. Regular checks and quick repairs when you spot problems save money and protect your property long-term.

Need a trusted London plumber? Book qualified, Gas Safe registered professionals who’ll get the job done properly.