Professional Plumbing Services in London
Our professional plumbers in London provide general plumbing, repairs and wet-side heating services for houses, flats, apartments, rental properties and commercial properties.
Our plumbing services include:
- General plumbing and plumbing repairs
- Leaking and damaged pipe repairs
- Dripping and leaking taps
- Toilet repairs and installations
- Basin and sink plumbing
- Shower and bath plumbing
- Bathroom installations
- Hot and cold water pipework
- Vented and unvented hot water cylinders
- Water pressure problems
- Stopcocks and isolation valves
- Appliance plumbing connections
- Radiators and heating pipework
- Thermostatic radiator valves
- Heating pumps and system balancing
- Underfloor heating pipework
- Mains water supply pipework
- Plumbing maintenance
- Property maintenance plumbing
- Residential plumbing
- Commercial plumbing
- Plumbing fault finding
For businesses, landlords and property professionals, see our commercial plumbing services.
Protect Your Home. Get the Right Plumber First
Leak Detection in London
Hidden water leaks can develop beneath floors, behind walls and above ceilings. We use pressure testing, thermal imaging, acoustic detection and tracer gas to investigate concealed leaks, identify the likely source and recommend targeted access or repairs as needed.
✔ Non-invasive leak investigation
✔ Detailed photographic reports
Plumbing
Our London plumbers repair leaking pipes, dripping taps, faulty toilets and bathroom plumbing. We also carry out maintenance, installations and hot water plumbing for homes and commercial properties, identifying the problem before completing suitable repairs safely.
✔ Professional plumbing repairs
✔ Residential & commercial plumbing
Boiler Losing Pressure
Central heating losing pressure without a visible leak? Water may escape beneath floors, behind walls or at pipe connections. We use pressure testing, thermal imaging and specialist methods to investigate heating leaks before recommending targeted access or repairs.
✔ Non-invasive heating leak investigation
✔ Detailed Trace & Access reporting
How to Book a Plumber in London
Need a London plumber for a repair, heating problem or specialist leak investigation? Tell us what is happening, and we will establish the appropriate service before arranging your appointment. Request a plumbing quote to get started.
1
Tell Us About the Plumbing Job
Tell us about your plumbing issue by phone or through our online quotation form. Whether you need general or commercial plumbing, or specialist leak detection, photographs can help us understand visible faults and the service you may need before the appointment.
2
We Establish the Appropriate Service
Based on the information provided, we establish whether you need general plumbing, bathroom or hot water work, wet-side heating services or a specialist leak investigation, so the appropriate service can be arranged.
3
Arrange Your Appointment
Choose an available morning or afternoon appointment that fits your schedule. We arrange plumbing, heating and leak detection visits across North London and surrounding areas during our normal working hours.
4
We Assess the Plumbing Work
Our plumber or heating engineer attends within the arranged appointment window, checks the plumbing or heating problem and explains the work required. We then carry out the appropriate repair within the agreed scope.
5
Repair and Explanation
Once the plumbing work is complete, our engineer explains what was found, what work was carried out and whether any further repair or maintenance is recommended. Payment can then be made directly by card using chip-and-PIN or contactless.
Plumbing Repairs in London
Our London plumbers carry out plumbing repairs ranging from small everyday faults to more complicated problems involving water systems and concealed pipework.
Common plumbing jobs include leaking pipes, faulty valves, dripping taps, toilet cistern problems, leaking bathroom fittings, damaged connections and hot and cold water supply faults. These are some of the most common plumbing issues we attend to for customers across London.
An experienced plumber should establish what has failed before replacing components unnecessarily. Where the plumbing fault is visible, we assess the problem and determine the appropriate repair.
Where the symptoms do not reveal the source, further investigation may be required—particularly when water has travelled through floors, ceilings or wall cavities.
The objective is simple: identify the actual plumbing issue and fix the correct component.
Leaking Pipes and Water Leaks
A leaking pipe can range from a small weeping connection or pinhole leak to a significant burst pipe.
The correct repair depends on the location, pipe material, water pressure and whether the damaged pipework is accessible.
Common signs include:
- Visible water around pipework
- Leaking valves or fittings
- Damp patches on walls or ceilings
- Water beneath floors
- Staining beneath bathrooms
- Unexplained water usage
- Reduced water pressure
- Recurring leaks after previous repairs
Where the leaking pipe is accessible, our plumbers can assess and repair the affected pipework.
If the water source is concealed, it is important to establish its location before unnecessary floors, walls or ceilings are opened.
Dripping Taps, Toilets, Sinks and Everyday Plumbing Jobs
Not every plumbing problem requires a complex investigation.
Our local plumbing services cover everyday faults including dripping taps, running toilets, leaking cisterns, faulty valves, sink and basin leaks, shower connections and damaged plumbing fittings.
A continuously running toilet or dripping tap can waste water and cost customers money over time. Small leaks around fittings can also damage cabinets, flooring and surrounding materials.
We identify the faulty component and explain whether it can be fixed or whether replacement is the more appropriate solution.
Bathroom Plumbing and Bathroom Installations
Bathrooms contain numerous water supplies, wastes, valves, seals and plumbing connections within a relatively small area.
Our bathroom plumbing work includes:
- Toilets and concealed cisterns
- Basins and vanity units
- Baths
- Showers
- Taps and mixers
- Hot and cold water supplies
- Waste connections
- Isolation valves
- Bathroom radiators
- Associated pipework
We also carry out bathroom installation and refurbishment plumbing, including first-fix and second-fix plumbing work.
Loose connections, poorly installed pipework, damaged fittings and failed seals are common causes of bathroom water damage.
Our experience investigating bathroom plumbing problems also influences how we approach installations: plumbing systems should be properly planned, accessible where practical and installed to reduce the likelihood of future problems.
Hot Water Cylinders and Hot Water Plumbing
Our plumbers work on vented and unvented hot water systems, including cylinders, valves and associated plumbing and pipework.
Our engineers hold G3 qualifications for Unvented and Vented Hot Water Systems, allowing us to undertake appropriate cylinder work within that scope.
Hot water problems can originate from valves, pipework, cylinders, pressure or flow.
Correct diagnosis matters because establishing which part of the water system is actually faulty can prevent unnecessary replacement work.
Heating Engineers – Central Heating Plumbing and Radiators
Our heating engineers work on the water side of central heating systems.
As a plumbing and heating company, our heating services include:
- Central heating pipework
- Radiators
- Thermostatic radiator valves
- Heating pumps
- System balancing
- Underfloor heating pipework
- Heating-system water leaks
- Heating pressure-loss investigation
If a sealed central heating system repeatedly loses pressure, the cause may be an accessible component or a concealed leak within the heating pipework.
Where the source cannot be seen, the system can be investigated before floors or walls are unnecessarily opened.
Water Pressure and Mains Water Problems
Low water pressure, fluctuating pressure or an unexpected change in water flow can have several causes.
The plumbing issue may affect a single tap, one part of the property or the entire water supply.
Depending on the symptoms, we can check accessible valves, stopcocks, plumbing fittings and the incoming mains supply.
A water meter that continues registering consumption when all outlets are closed can also indicate water loss somewhere between the meter and the property.
The important first step is establishing whether the problem originates within the internal plumbing system or the incoming water supply.
Local Plumbers in London
Our local plumbers in London work in houses, flats, apartments, conversions and rental properties.
London’s building stock varies considerably, and this directly affects plumbing work.
Victorian and Edwardian properties can contain several generations of plumbing alterations. Mansion blocks may have shared services and long pipe runs. Modern apartments frequently conceal plumbing behind finished walls, service voids and solid floors.
Understanding how different London properties are constructed can help an experienced plumber determine where pipework is likely to run and how a plumbing fault should be investigated.
Our local plumbers provide plumbing repairs, installations and maintenance throughout our established London service areas.
Commercial Plumbing in London
MML Plumbing provides commercial plumbing services for suitable commercial properties, landlords, managing agents, commercial customers and business premises.
Commercial plumbing requirements can involve larger water systems, multiple washrooms, heavier usage and more complicated pipework than a typical residential property.
Our commercial plumbing work includes repairs, maintenance, fault-finding, water-system problems and appropriate plumbing installations.
Where unexplained water loss is affecting a commercial property, specialist investigation can also be arranged.
Plumbing for Landlords, Managing Agents and Property Owners
Property maintenance often requires more than completing an individual plumbing repair.
Landlords, managing agents and property owners may need to understand what failed, what plumbing work was carried out and whether further maintenance should be planned.
We support property maintenance across London with general plumbing, wet-side heating work and fault finding.
Where appropriate, findings can also be documented to provide a clearer record of the problem and the work undertaken. Our team can provide practical advice on follow-up plumbing maintenance where required.
Specialist Leak Detection in London
When a water leak cannot be seen, opening floors or walls based on guesswork can cause unnecessary disruption without locating the actual fault.
Our specialist Leak Detection in London service investigates concealed water leaks, unexplained damp, heating pressure loss and underground supply leaks using appropriate diagnostic methods.
For unexplained damp and moisture problems, we also provide Moisture Mapping & Damp Investigation.
Detailed information about thermal imaging, acoustic detection, hydrogen tracer gas, Trace & Access reporting and our full investigation process is kept on the dedicated leak detection page rather than duplicated here.
Transparent and Upfront Plumbing Pricing
Knowing how plumbing work will be charged is important before a job begins.
We aim to make the scope and pricing clear before agreed work proceeds.
Straightforward plumbing jobs may be possible to assess from the description and photographs provided. Where the cause of a fault is unknown, investigation may need to be completed before the full repair cost can be established.
This distinction matters. Quoting for a repair before anyone knows what has actually failed can result in unnecessary work or inaccurate pricing.
Our approach is to establish the appropriate scope first and explain the expected costs before proceeding with agreed work.
You can request a plumbing quote online and provide photographs and information about the plumbing job.
Why Choose MML Plumbing?
MML Plumbing is a family-run professional plumbing company serving London.
We are a small, dedicated team, so customers deal directly with the people responsible for organising and carrying out the work rather than going through a large call-centre structure.
Reasons customers choose our plumbing services include:
- Qualified and experienced plumbers
- Professional plumbing and heating knowledge
- WaterSafe Approved Contractor
- WRAS Approved
- G3 hot water system qualifications
- £2 million public liability insurance
- Transparent pricing
- Clear explanations before work proceeds
- Residential and commercial plumbing experience
- Water Regulations knowledge
- Evidence-based fault finding where required
- Appropriate repair rather than unnecessary replacement
- Direct communication with our team
- Respect for the customer’s property
We work in Victorian terraces, conversions, mansion blocks, purpose-built flats, modern apartments and commercial properties across London.
For us, great customer service means clear communication from first contact through completion, efficient plumbing work and making sure the customer understands what the problem was, what was repaired and whether anything further is recommended.
Qualified and Experienced London Plumbers
Professional plumbing requires practical experience as well as knowledge of water systems, installation standards and regulations.
Our expert London plumbers have qualifications and technical experience, including:
Plumbing and Water Systems
- City & Guilds NVQ Level 2 in Plumbing
- NVQ Level 3 Diploma in Plumbing & Heating
- WRAS Approved – Water Regulations
- WaterSafe Approved Contractor
- G3 – Unvented & Vented Hot Water Systems
Plumbing and Heating Experience
Our qualifications and experience cover multiple aspects of domestic and commercial plumbing and heating work, including:
- Domestic plumbing systems
- Commercial plumbing systems
- Hot and cold water pipework
- Hot water cylinders
- Central heating pipework
- Radiators and valves
- Underfloor heating systems
- Bathroom plumbing
- Mains water supplies
- Water-pressure problems
- Plumbing maintenance
Specialist Diagnostic Experience
- Acoustic leak detection
- Hydrogen tracer gas leak detection
- ITC Certified Thermal Imaging Diagnostics
- Moisture Mapping & Damp Investigation
- IICRC Certified – Water Damage Inspection Standards
- Central heating and UFH leak investigation
- Mains water and underground pipe diagnostics
- Detailed Trace & Access reporting
This combination means we can deal with straightforward plumbing repairs while also recognising when a more complicated problem requires systematic investigation.
Case Study-Ceiling Leak Detection in North London
A North London flat owner contacted us after weeks of water staining repeatedly appearing on the bedroom ceiling. Several plumbers had already inspected the bathroom above, including the sink, shower, toilet and surrounding plumbing, without finding the source. Tiles had even been removed above the toilet and beneath the washing machine, but the cause remained unidentified.
We carried out a systematic non-invasive leak investigation using thermal imaging, moisture mapping, borescope inspection and dye testing across the bathroom. Instead of assuming the damp area directly below the bathroom was the source, we followed the evidence and water migration path. The investigation traced the problem to a cracked concealed toilet cistern and a failed seal around the toilet waste connection. Water had been escaping behind the concealed cistern and travelling through the floor structure into the ceiling cavity below, with very little visible evidence at the point of origin.
The source was confirmed without further unnecessary opening of floors or walls. We produced a detailed photographic report documenting the investigation, findings, likely water migration path and recommended repair, providing clear evidence that could support an insurance or Trace & Access claim and contractor handover.
By establishing the actual source before further access work was carried out, the homeowner could move forward with a targeted repair rather than continuing exploratory work across the bathroom.
The source was traced to a cracked concealed toilet cistern and a failed waste connection seal.
A detailed photographic report documented the testing, findings and recommended repair.
Targeted repair could be planned without continuing unnecessary exploratory work.
This real North London case demonstrates how concealed plumbing leaks can allow water to travel away from the original fault before visible staining appears.
Real Plumbing Work Across London
Plumbing and heating problems that initially look similar can have very different causes.
That is why our plumbing and leak detection case studies document genuine jobs, testing, findings and outcomes from properties across London.
SW19 Heating System Losing Pressure – Multiple Hidden Faults Found
At a large mixed-use property in SW19, the central heating system was losing pressure equivalent to approximately three litres of water per day, despite several previous investigations finding no obvious leak.
The property had two boilers, two hot-water cylinders, around 25 radiators and extensive heating pipework. Our investigation identified multiple small leaks and component faults. Tracer gas from the heating circuit was also detected on the domestic hot-water side, indicating a possible internal crossover between the two systems.
The case demonstrated why significant pressure loss does not always come from one concealed pipe leak beneath the floor. Testing the system systematically allowed several contributing faults to be identified rather than assuming a single cause.
You can read the complete SW19 heating pressure-loss case study.
Pre-Purchase Plumbing and Heating Surveys in London
Plumbing and heating systems can represent a significant part of a property’s future maintenance costs.
A standard building survey does not necessarily provide a detailed assessment of plumbing systems, hot water equipment and heating pipework.
Our pre-purchase plumbing and heating surveys can help buyers understand the visible condition of these systems before committing to a property.
The findings can identify potential plumbing issues, provide information for future maintenance planning and help buyers make a more informed decision.
Plumbing Work in North London
See examples of plumbing work across North London, where MML Plumbing investigates the problem, establishes the cause and carries out the appropriate repair. Our work includes plumbing and pipework repairs, heating and hot water systems, water-pressure problems, concealed leaks and specialist leak detection. For more complex faults, we use systematic testing to build evidence before unnecessary floors, walls or ceilings are opened. Explore our plumbing and leak detection case studies to see real investigations, findings, repairs and outcomes from work carried out across North London.
How we found hidden water leaks without damaging your home
Book a Professional Plumber in London
If you need a plumber in London for a leaking pipe, dripping tap, faulty toilet, bathroom plumbing, hot water system, heating pipework or another plumbing problem, contact MML Plumbing and tell us what is happening.
Our local plumbers provide professional plumbing services for residential and commercial customers throughout our London coverage area.
For straightforward plumbing issues, we establish the appropriate plumbing service. For more complicated faults, we determine whether further investigation is required before repair work begins.
Professional plumbing. Clear diagnosis. Appropriate repair.
We don’t guess. We prove. Then we fix.
Expert London Plumbers
Specialist Plumbing and Leak Detection Across London
If you have a plumbing or leak detection problem to discuss, contact MML Plumbing, and the right specialist will come back to you. Whether you require repairs, installations, or maintenance, including plumbing fast services for issues like burst pipes, we’ve got you covered. With our commitment to quality workmanship and customer satisfaction, you can trust us to deliver outstanding results every time. Book one of our top plumbers in London and receive excellent customer service!
Don’t wait for water damage or heating failure. If you have noticed something wrong — unexplained damp, pressure loss, or a plumbing fault that keeps returning — contact MML Plumbing. We investigate properly before recommending anything.
Frequently Asked Questions
Question not answered? Ask A Question
How do I find a reliable plumber in London for a plumbing repair?
Look for a plumber with recognised plumbing qualifications, appropriate public liability insurance, genuine customer reviews and experience with the type of plumbing problem you have. The plumber should also explain the likely scope and pricing before agreed work begins rather than recommending unnecessary replacement work.
How much does a plumber in London charge for a plumbing repair?
The cost depends on the type of plumbing job, the time required, materials and whether the cause of the problem is already known. Straightforward repairs may be possible to price from photographs and a description, while concealed or recurring faults may require investigation before an accurate repair cost can be confirmed.
Can a plumber fix a leaking pipe without replacing all the pipework?
Often, yes. If the damaged section of pipe is accessible and the surrounding pipework is in suitable condition, a targeted repair may be possible. The correct approach depends on the pipe material, location, condition and cause of the leak.
Why does my toilet keep running after I flush it?
A toilet that continues running may have a problem with the fill valve, flush mechanism, seal, float or another component inside the cistern. A plumber can inspect the mechanism and determine whether the faulty part can be repaired or should be replaced.
Why is my tap still dripping after it has been turned off?
A dripping tap can be caused by a worn cartridge, washer, valve or damaged internal component. The correct repair depends on the type and condition of the tap. In some cases, replacing the internal component is sufficient; in others, replacing the tap is more practical.
Why is there water underneath my kitchen sink?
Water beneath a kitchen sink can come from the tap connections, isolation valves, supply pipes, waste fittings, sink seal or appliance connections. Because several plumbing components occupy the same small area, the source should be identified before parts are replaced.
Why is water leaking through the ceiling below my bathroom?
Water coming through a ceiling below a bathroom can originate from supply pipework, a toilet, bath, shower, basin, waste connection or failed seals around wet areas. The point where water appears downstairs is not necessarily directly below the source, so the bathroom should be tested systematically before the ceiling is unnecessarily opened.
Why does my water pressure suddenly seem lower than normal?
Low water pressure can be caused by partially closed valves, restrictions, plumbing faults, problems affecting individual outlets or changes to the incoming mains water supply. Whether the pressure has dropped at one tap or throughout the whole property helps determine where the investigation should begin.
Why do I have good water pressure downstairs but low pressure upstairs?
A difference between floors can be related to the property’s water-supply arrangement, restrictions, valves, pipe sizing or the particular outlets affected. A plumber can compare the flow and pressure at different points to help establish whether the problem is localised or affects the wider plumbing system.
Why does my central heating system keep losing pressure?
Repeated pressure loss can result from an accessible component, radiator valve, heating pipework or a concealed water leak within the sealed heating circuit. If there is no visible source, the water side of the heating system may need further investigation before floors or walls are opened.
Can a plumber repair a leaking radiator or radiator valve?
Yes. Leaks can occur at radiator valves, connections, pipework or the radiator itself. The correct repair depends on exactly where the water is escaping and the condition of the affected component.
Who can work on an unvented hot water cylinder in London?
Work on an unvented hot water cylinder should be carried out by someone appropriately qualified for that system. MML Plumbing holds G3 qualifications for Unvented and Vented Hot Water Systems and undertakes appropriate cylinder and associated plumbing work within that scope.
Why am I not getting enough hot water from my cylinder?
Insufficient hot water can have several possible causes involving the cylinder, valves, water flow, controls or associated pipework. The system should be assessed to establish which component or part of the installation is causing the problem before replacement work is recommended.
Can a plumber change the pipework when I renovate my bathroom?
Yes. Bathroom refurbishment can involve altering hot and cold water supplies, wastes, radiator pipework and connections for baths, showers, basins and toilets. First-fix plumbing is normally completed before finishes are installed, followed by second-fix installation of the bathroom fittings.
Do I need a plumber before installing a new bathroom?
It is advisable to establish the plumbing layout before the bathroom is finished. The position of water supplies, wastes, valves, bath or shower connections, toilet outlets and radiator pipework can affect the final bathroom layout and installation.
Can a plumber investigate a high water bill when there is no visible leak?
Yes. An unexplained increase in water consumption can indicate a plumbing or supply-pipe problem even when no water is visible. Initial checks can help establish whether water is continuing to pass through the meter when the property’s outlets are closed and whether further investigation is required.
How can I tell whether a water leak is inside my house or on the mains supply pipe?
The symptoms, water-meter behaviour and isolation of different parts of the plumbing system can help distinguish an internal plumbing leak from a problem on the incoming supply pipe. Underground or concealed supply-pipe leaks may require more detailed investigation.
Do you provide plumbers for landlords and rental properties in London?
Yes. We provide plumbing repairs, maintenance and fault finding for landlords, managing agents and suitable rental properties within our London service area. Where required, we can also document findings and recommended follow-up work.
Do you provide commercial plumbers for offices and business premises in London?
Yes. We undertake suitable commercial plumbing repairs, maintenance, installations and fault finding for commercial customers, managing agents and business premises. The scope depends on the property’s plumbing system and the work required.
What should I do first if a pipe bursts in my London property?
If it is safe to do so, turn off the water at the stopcock to reduce further water loss. Keep water away from electrical equipment and affected electrical areas, move vulnerable belongings where possible, and arrange for the damaged pipework to be assessed.
When should I book leak detection instead of a normal plumbing visit?
A normal plumbing visit is usually appropriate when the fault and its location are visible. Specialist leak detection is more appropriate when there is unexplained damp, water appearing away from the suspected source, repeated heating pressure loss, an unexplained high water bill, a suspected underground supply leak or another concealed water leak.
