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For many homeowners, upgrading offers better water pressure, improved energy efficiency, and valuable space-saving benefits. If you’re renovating or modernising your home, an unvented system is often a smart investment.
Non-Destructive Leak Detection Services London
At London Drainage Facilities Ltd, we understand the importance of maintaining a leak-free plumbing and drainage system in your home or business. With over 15 years of experience in trace and access leak detection, our team of fully qualified and certified engineers use advanced technology to locate and resolve leaks with precision. Whether the issue is a concealed pipe leak, water ingress or water main’s fault, we provide tailored solutions with minimal disruption to your property.
Advanced Leak Detection Technology
Our engineers utilise state-of-the-art leak detection equipment to locate leaks quickly and accurately, including:
- Acoustic Profiling – Identifying leaks by analysing sound variations in pipe networks.
- Thermal Imaging – Using infrared cameras to detect temperature changes caused by hidden leaks.
- Tracer Gas Technology – Injecting safe, non-toxic gas to locate leaks in concealed pipework.
Plumbing Services
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Emergency Plumbing
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Plumbing Repairs
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Leak Detection
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Electrostatic Pathogen Cleaning Treatment
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Macerator Repairs
Learn moreHave an emergency? Or, perhaps you're looking for maintenance services or a quote?
Contact us for expert drainage and plumbing support, day or night.
Why choose London Drainage Facilities Ltd for your leak detection is London?
Most of our work comes from recommendation by existing customers, which is a testament to our level of service and workmanship.
- Highly rated on Trustpilot & Google
- Fully Qualified and Accredited
- 19 Years of Drainage & Plumbing Experience
- All Work Guaranteed
- Competitive Pricing across London
- Free Site Surveys
- No Obligation Quotations
- Fully Insured Local Company
- Expert Plumbing Repairs and Maintenance
- Drainage Repairs and Maintenance
With public liability insurance, competitive prices and our guarantees, we remain the preferred drainage and plumbing specialists in London.
You can rely on our expertise and professionalism when it comes to quality drainage and plumbing solutions.
See Our Case Studies
Explore our diverse range of successful drainage projects across London and beyond.
Our case studies showcase how London Drainage Facilities Ltd has delivered professional drainage solutions for residential properties, commercial buildings, industrial facilities, and public infrastructure.
From emergency drain repairs in historic buildings to implementing preventative maintenance systems for large commercial properties, these real-world examples demonstrate our versatility and dedication to excellence.
House of Commons
House of Commons
London Drainage Facilities attend the House of Commons to clear several rooms during flash flooding and torrential downpours during July 2021. Find out morePicote Concrete Removal
Picote Concrete Removal
London Drainage Facilities were delighted to win the tender for a ground-breaking project at Heathrow Airport. Our client, BAM Nuttall Ltd, had been working… Find out moreTanker & Wet Vac Services
Tanker & Wet Vac Services
When extreme weather hits the UK, this can be damaging and chaotic for public services. London Drainage Facilities were contacted to clear flash floods... Find out moreStorm Group
Storm Group
London Drainage Facilities were approached by Storm Group to offer vital support for their project at the Lion and Hogarth Centre in Brentwood. Find out moreMITCHELLS & BUTLERS (The Navigation Inn)
Mitchells & Butlers (The Navigation Inn)
To protect the business from repeated flood damage, we designed & delivered a comprehensive flood defence & drainage system. Find out moreMITCHELLS & BUTLERS (The Globe)
Mitchells & Butlers (The Globe)
With the pub only closed on Sundays, our team deployed three experienced plumbers to work in coordination with the client’s building contractor. Find out moreSpecialists in Non-Invasive Leak Detection
We utilise the latest non-invasive techniques to accurately locate leaks without unnecessary damage to your floors, walls or external structures. Our expert engineers combine industry knowledge with cutting-edge technology to trace leaks efficiently, ensuring cost-effective and lasting repairs.
Our leak detection services cater to a wide range of issues including:
Internal and External Pipework
Detection and repair of leaks in household and commercial plumbing systems.
Hot & Cold-Water Feeds
Locating leaks within supply pipes to prevent water damage and wastage.
Heating System Leaks
Identifying faults in boilers, radiators and pipework to restore efficiency.
Underfloor Heating Leaks
Tracing leaks beneath flooring without the need for extensive excavation.
Bath & Shower Leaks
Diagnosing leaks affecting bathrooms to prevent long-term water damage.
Flat Roof Leaks
Identifying areas of water ingress in flat roofing systems to prevent structural deterioration.
Condensation & Damp Surveys
Assessing moisture build-up and detecting hidden leaks contributing to damp problems.
Mains Water Leak Detection
Locating underground leaks in mains water systems before they escalate into costly repairs.
Waste Pipe Inspections
Identifying and resolving leaks in waste pipes to prevent blockages and water damage.
Moisture Surveys
Using advanced techniques to assess hidden damp issues within walls, ceilings and floors.
Swimming Pool Leak Detection
Diagnosing water loss in pools, pipes and surrounding structures.
Rainwater Ingress & Roof Leaks
Detecting leaks in roofing systems to prevent internal water damage.
Basement & Tanking Breaches
Identifying structural breaches leading to flooding or excessive moisture build-up.
Cavity Wall Breaches & Bridging
Detecting moisture penetration and ensuring proper insulation integrity.
CCTV Drainage Investigations
Conducting detailed drain surveys to detect leaks, blockages or structural defects.
Expert Water Mains Leak Detection in London
Undetected water leaks can persist for months without showing obvious signs, often leading to costly damage and increased water bills. Water mains leaks, particularly those in underground pipes or cold feed supply lines, can be difficult to identify without specialist equipment. At London Drainage Facilities Ltd, we provide professional water mains leak detection services, using state-of-the-art technology to accurately trace leaks inside and outside your property with minimal disruption.
Our experienced engineers can locate, and repair water mains leaks efficiently, preventing further damage and helping you reduce unnecessary water usage—leading to immediate savings on your water bills.
How to Identify a Potential Water Mains Leak
Many people assume that water leaks are always obvious, but in reality, smaller leaks can go unnoticed for long periods. Below are some key indicators that may suggest an issue with your water supply:
- Unexpectedly High Water Bills – A sudden increase in water usage with no change in consumption habits.
- Discoloured Water – Rusty, brown or cloudy water from taps may indicate a leak in underground pipes.
- Reduced Water Pressure – A significant drop in water pressure when using multiple taps or appliances.
- Surface Water or Damp Patches – Unexplained water pooling in gardens, driveways or along external walls.
- Unusual Sounds in Pipework – Hissing or dripping noises in pipes when taps are turned off.
- Mould or Damp Patches Indoors – Water leaks beneath floors or behind walls may cause damp or musty odours.
What You can Expect from London Drainage Facilities Ltd for Water Mains Leak Detection
- Advanced Leak Detection Technology – We use acoustic profiling, thermal imaging and tracer gas to pinpoint hidden leaks accurately.
- Minimal Disruption Repairs – Our engineers use non-invasive techniques to access and fix leaks without unnecessary damage to your property.
- Rapid Response Service – Available for urgent leak detection and repairs to prevent escalating water damage.
- Cost Savings & Efficiency – Our solutions help reduce water wastage, lowering your bills and avoiding long-term damage repair costs.
- Compliance & Professional Expertise – Fully qualified engineers ensuring compliance with UK water regulations.
FAQs About Leak Detection Services in London
Many leaks are not immediately visible but common signs include:
- Unexpectedly high water bills
- Damp patches or mould growth
- Reduced water pressure
- Unexplained sounds of running water
- Water pooling in unusual areas
Can I use an unvented cylinder with any boiler?
Unvented cylinders work well with system or regular boilers, but not with combi boilers, as combi systems don’t require a hot water cylinder. Your installer will help determine the best setup based on your current system and hot water needs.
How much maintenance does an unvented system require?
Unvented cylinders should be serviced annually by a qualified engineer to ensure they remain safe and efficient. Regular maintenance helps prevent issues and extends the lifespan of the system.
Do I need good water pressure to install an unvented cylinder?
Yes, because unvented cylinders rely on mains pressure, it’s important to have a strong and consistent water supply. A qualified installer will assess your pressure levels during the initial survey to ensure suitability.
Are unvented systems safe?
Yes, unvented hot water cylinders are very safe when installed and maintained correctly. They are fitted with multiple safety features such as pressure relief valves, thermostats, and expansion vessels to prevent overpressure and overheating.
What is an unvented hot water cylinder?
An unvented hot water cylinder is a sealed system that connects directly to the mains water supply. It delivers hot water at high pressure without the need for a separate cold water tank in the loft, making it a more modern and space-efficient solution.
How much does scheduled drain maintenance cost?
Our scheduled drain maintenance services include unlimited free of charge callouts to all serviced drains, which gives our customers great peace of mind when it comes to knowing that an allocated annual budget for drainage work is in place for any work that is required. The costs of our drain maintenance service varies depending on...Continue reading→
Can drain maintenance help prevent emergency blockages?
Yes, regular drain maintenance is the most effective way to prevent emergency blockages. By routinely clearing your drains, we remove build-up before it becomes a major issue, reducing the likelihood of sudden blockages, overflows and potential property damage.
What are the benefits of signing up for a drain maintenance programme?
Our drain maintenance programme offers a proactive approach to keeping your drainage system in peak condition. Benefits include: Unlimited free callouts for serviced drainage Preventative maintenance to avoid costly repairs Improved hygiene by reducing odours and bacteria build-up Extended drain lifespan by minimising wear and tear Fixed costs, allowing you to plan your budget with...Continue reading→
What is included in a drain maintenance service?
Our drain maintenance service includes: High-pressure water jetting to clear build-up Electro-mechanical coring to remove scale and debris A full inspection of your drainage system Identification of potential issues before they escalate A detailed report on the work carried out and any recommendations for future care
At London Drainage Facilities Ltd we use a combination of non-invasive techniques including:
- Acoustic profiling
- Thermal imaging
- Moisture mapping
- Tracer gas testing
- CCTV drain inspections
Is it worth upgrading from a vented to an unvented cylinder?
For many homeowners, upgrading offers better water pressure, improved energy efficiency, and valuable space-saving benefits. If you’re renovating or modernising your home, an unvented system is often a smart investment.
Can I use an unvented cylinder with any boiler?
Unvented cylinders work well with system or regular boilers, but not with combi boilers, as combi systems don’t require a hot water cylinder. Your installer will help determine the best setup based on your current system and hot water needs.
How much maintenance does an unvented system require?
Unvented cylinders should be serviced annually by a qualified engineer to ensure they remain safe and efficient. Regular maintenance helps prevent issues and extends the lifespan of the system.
Do I need good water pressure to install an unvented cylinder?
Yes, because unvented cylinders rely on mains pressure, it’s important to have a strong and consistent water supply. A qualified installer will assess your pressure levels during the initial survey to ensure suitability.
Are unvented systems safe?
Yes, unvented hot water cylinders are very safe when installed and maintained correctly. They are fitted with multiple safety features such as pressure relief valves, thermostats, and expansion vessels to prevent overpressure and overheating.
What is an unvented hot water cylinder?
An unvented hot water cylinder is a sealed system that connects directly to the mains water supply. It delivers hot water at high pressure without the need for a separate cold water tank in the loft, making it a more modern and space-efficient solution.
How much does scheduled drain maintenance cost?
Our scheduled drain maintenance services include unlimited free of charge callouts to all serviced drains, which gives our customers great peace of mind when it comes to knowing that an allocated annual budget for drainage work is in place for any work that is required. The costs of our drain maintenance service varies depending on...Continue reading→
Can drain maintenance help prevent emergency blockages?
Yes, regular drain maintenance is the most effective way to prevent emergency blockages. By routinely clearing your drains, we remove build-up before it becomes a major issue, reducing the likelihood of sudden blockages, overflows and potential property damage.
What are the benefits of signing up for a drain maintenance programme?
Our drain maintenance programme offers a proactive approach to keeping your drainage system in peak condition. Benefits include: Unlimited free callouts for serviced drainage Preventative maintenance to avoid costly repairs Improved hygiene by reducing odours and bacteria build-up Extended drain lifespan by minimising wear and tear Fixed costs, allowing you to plan your budget with...Continue reading→
What is included in a drain maintenance service?
Our drain maintenance service includes: High-pressure water jetting to clear build-up Electro-mechanical coring to remove scale and debris A full inspection of your drainage system Identification of potential issues before they escalate A detailed report on the work carried out and any recommendations for future care
No, our leak detection methods are non-invasive, meaning we locate leaks without unnecessary digging or structural damage. We only proceed with targeted repairs once the leak has been accurately identified.
Is it worth upgrading from a vented to an unvented cylinder?
For many homeowners, upgrading offers better water pressure, improved energy efficiency, and valuable space-saving benefits. If you’re renovating or modernising your home, an unvented system is often a smart investment.
Can I use an unvented cylinder with any boiler?
Unvented cylinders work well with system or regular boilers, but not with combi boilers, as combi systems don’t require a hot water cylinder. Your installer will help determine the best setup based on your current system and hot water needs.
How much maintenance does an unvented system require?
Unvented cylinders should be serviced annually by a qualified engineer to ensure they remain safe and efficient. Regular maintenance helps prevent issues and extends the lifespan of the system.
Do I need good water pressure to install an unvented cylinder?
Yes, because unvented cylinders rely on mains pressure, it’s important to have a strong and consistent water supply. A qualified installer will assess your pressure levels during the initial survey to ensure suitability.
Are unvented systems safe?
Yes, unvented hot water cylinders are very safe when installed and maintained correctly. They are fitted with multiple safety features such as pressure relief valves, thermostats, and expansion vessels to prevent overpressure and overheating.
What is an unvented hot water cylinder?
An unvented hot water cylinder is a sealed system that connects directly to the mains water supply. It delivers hot water at high pressure without the need for a separate cold water tank in the loft, making it a more modern and space-efficient solution.
How much does scheduled drain maintenance cost?
Our scheduled drain maintenance services include unlimited free of charge callouts to all serviced drains, which gives our customers great peace of mind when it comes to knowing that an allocated annual budget for drainage work is in place for any work that is required. The costs of our drain maintenance service varies depending on...Continue reading→
Can drain maintenance help prevent emergency blockages?
Yes, regular drain maintenance is the most effective way to prevent emergency blockages. By routinely clearing your drains, we remove build-up before it becomes a major issue, reducing the likelihood of sudden blockages, overflows and potential property damage.
What are the benefits of signing up for a drain maintenance programme?
Our drain maintenance programme offers a proactive approach to keeping your drainage system in peak condition. Benefits include: Unlimited free callouts for serviced drainage Preventative maintenance to avoid costly repairs Improved hygiene by reducing odours and bacteria build-up Extended drain lifespan by minimising wear and tear Fixed costs, allowing you to plan your budget with...Continue reading→
What is included in a drain maintenance service?
Our drain maintenance service includes: High-pressure water jetting to clear build-up Electro-mechanical coring to remove scale and debris A full inspection of your drainage system Identification of potential issues before they escalate A detailed report on the work carried out and any recommendations for future care
Yes, we specialise in detecting concealed leaks beneath flooring, inside walls and underground. Our advanced technology allows us to pinpoint leaks without the need for destructive investigations.
Is it worth upgrading from a vented to an unvented cylinder?
For many homeowners, upgrading offers better water pressure, improved energy efficiency, and valuable space-saving benefits. If you’re renovating or modernising your home, an unvented system is often a smart investment.
Can I use an unvented cylinder with any boiler?
Unvented cylinders work well with system or regular boilers, but not with combi boilers, as combi systems don’t require a hot water cylinder. Your installer will help determine the best setup based on your current system and hot water needs.
How much maintenance does an unvented system require?
Unvented cylinders should be serviced annually by a qualified engineer to ensure they remain safe and efficient. Regular maintenance helps prevent issues and extends the lifespan of the system.
Do I need good water pressure to install an unvented cylinder?
Yes, because unvented cylinders rely on mains pressure, it’s important to have a strong and consistent water supply. A qualified installer will assess your pressure levels during the initial survey to ensure suitability.
Are unvented systems safe?
Yes, unvented hot water cylinders are very safe when installed and maintained correctly. They are fitted with multiple safety features such as pressure relief valves, thermostats, and expansion vessels to prevent overpressure and overheating.
What is an unvented hot water cylinder?
An unvented hot water cylinder is a sealed system that connects directly to the mains water supply. It delivers hot water at high pressure without the need for a separate cold water tank in the loft, making it a more modern and space-efficient solution.
How much does scheduled drain maintenance cost?
Our scheduled drain maintenance services include unlimited free of charge callouts to all serviced drains, which gives our customers great peace of mind when it comes to knowing that an allocated annual budget for drainage work is in place for any work that is required. The costs of our drain maintenance service varies depending on...Continue reading→
Can drain maintenance help prevent emergency blockages?
Yes, regular drain maintenance is the most effective way to prevent emergency blockages. By routinely clearing your drains, we remove build-up before it becomes a major issue, reducing the likelihood of sudden blockages, overflows and potential property damage.
What are the benefits of signing up for a drain maintenance programme?
Our drain maintenance programme offers a proactive approach to keeping your drainage system in peak condition. Benefits include: Unlimited free callouts for serviced drainage Preventative maintenance to avoid costly repairs Improved hygiene by reducing odours and bacteria build-up Extended drain lifespan by minimising wear and tear Fixed costs, allowing you to plan your budget with...Continue reading→
What is included in a drain maintenance service?
Our drain maintenance service includes: High-pressure water jetting to clear build-up Electro-mechanical coring to remove scale and debris A full inspection of your drainage system Identification of potential issues before they escalate A detailed report on the work carried out and any recommendations for future care
The duration depends on the complexity of the leak, but most leak detection surveys take between 1 to 3 hours. Our expert team works efficiently to identify and diagnose the issue as quickly as possible.
Is it worth upgrading from a vented to an unvented cylinder?
For many homeowners, upgrading offers better water pressure, improved energy efficiency, and valuable space-saving benefits. If you’re renovating or modernising your home, an unvented system is often a smart investment.
Can I use an unvented cylinder with any boiler?
Unvented cylinders work well with system or regular boilers, but not with combi boilers, as combi systems don’t require a hot water cylinder. Your installer will help determine the best setup based on your current system and hot water needs.
How much maintenance does an unvented system require?
Unvented cylinders should be serviced annually by a qualified engineer to ensure they remain safe and efficient. Regular maintenance helps prevent issues and extends the lifespan of the system.
Do I need good water pressure to install an unvented cylinder?
Yes, because unvented cylinders rely on mains pressure, it’s important to have a strong and consistent water supply. A qualified installer will assess your pressure levels during the initial survey to ensure suitability.
Are unvented systems safe?
Yes, unvented hot water cylinders are very safe when installed and maintained correctly. They are fitted with multiple safety features such as pressure relief valves, thermostats, and expansion vessels to prevent overpressure and overheating.
What is an unvented hot water cylinder?
An unvented hot water cylinder is a sealed system that connects directly to the mains water supply. It delivers hot water at high pressure without the need for a separate cold water tank in the loft, making it a more modern and space-efficient solution.
How much does scheduled drain maintenance cost?
Our scheduled drain maintenance services include unlimited free of charge callouts to all serviced drains, which gives our customers great peace of mind when it comes to knowing that an allocated annual budget for drainage work is in place for any work that is required. The costs of our drain maintenance service varies depending on...Continue reading→
Can drain maintenance help prevent emergency blockages?
Yes, regular drain maintenance is the most effective way to prevent emergency blockages. By routinely clearing your drains, we remove build-up before it becomes a major issue, reducing the likelihood of sudden blockages, overflows and potential property damage.
What are the benefits of signing up for a drain maintenance programme?
Our drain maintenance programme offers a proactive approach to keeping your drainage system in peak condition. Benefits include: Unlimited free callouts for serviced drainage Preventative maintenance to avoid costly repairs Improved hygiene by reducing odours and bacteria build-up Extended drain lifespan by minimising wear and tear Fixed costs, allowing you to plan your budget with...Continue reading→
What is included in a drain maintenance service?
Our drain maintenance service includes: High-pressure water jetting to clear build-up Electro-mechanical coring to remove scale and debris A full inspection of your drainage system Identification of potential issues before they escalate A detailed report on the work carried out and any recommendations for future care
Many home insurance policies cover leak detection and associated repairs, particularly if the leak has caused damage. It is always best to check your policy. We provide detailed reports to assist with insurance claims, ensuring you have the necessary evidence to support your case.
Is it worth upgrading from a vented to an unvented cylinder?
For many homeowners, upgrading offers better water pressure, improved energy efficiency, and valuable space-saving benefits. If you’re renovating or modernising your home, an unvented system is often a smart investment.
Can I use an unvented cylinder with any boiler?
Unvented cylinders work well with system or regular boilers, but not with combi boilers, as combi systems don’t require a hot water cylinder. Your installer will help determine the best setup based on your current system and hot water needs.
How much maintenance does an unvented system require?
Unvented cylinders should be serviced annually by a qualified engineer to ensure they remain safe and efficient. Regular maintenance helps prevent issues and extends the lifespan of the system.
Do I need good water pressure to install an unvented cylinder?
Yes, because unvented cylinders rely on mains pressure, it’s important to have a strong and consistent water supply. A qualified installer will assess your pressure levels during the initial survey to ensure suitability.
Are unvented systems safe?
Yes, unvented hot water cylinders are very safe when installed and maintained correctly. They are fitted with multiple safety features such as pressure relief valves, thermostats, and expansion vessels to prevent overpressure and overheating.
What is an unvented hot water cylinder?
An unvented hot water cylinder is a sealed system that connects directly to the mains water supply. It delivers hot water at high pressure without the need for a separate cold water tank in the loft, making it a more modern and space-efficient solution.
How much does scheduled drain maintenance cost?
Our scheduled drain maintenance services include unlimited free of charge callouts to all serviced drains, which gives our customers great peace of mind when it comes to knowing that an allocated annual budget for drainage work is in place for any work that is required. The costs of our drain maintenance service varies depending on...Continue reading→
Can drain maintenance help prevent emergency blockages?
Yes, regular drain maintenance is the most effective way to prevent emergency blockages. By routinely clearing your drains, we remove build-up before it becomes a major issue, reducing the likelihood of sudden blockages, overflows and potential property damage.
What are the benefits of signing up for a drain maintenance programme?
Our drain maintenance programme offers a proactive approach to keeping your drainage system in peak condition. Benefits include: Unlimited free callouts for serviced drainage Preventative maintenance to avoid costly repairs Improved hygiene by reducing odours and bacteria build-up Extended drain lifespan by minimising wear and tear Fixed costs, allowing you to plan your budget with...Continue reading→
What is included in a drain maintenance service?
Our drain maintenance service includes: High-pressure water jetting to clear build-up Electro-mechanical coring to remove scale and debris A full inspection of your drainage system Identification of potential issues before they escalate A detailed report on the work carried out and any recommendations for future care