Specialist Leak Detection
Focused investigation for concealed or uncertain leaks within homes.
Internal Plumbing Leak Detection
Plumbing Leak Detection
Specialist plumbing leak detection for suspected internal leaks, using methods selected for the pipework, property and available evidence.
Our home water leak detection services investigate a suspected concealed water leak in internal hot and cold water pipework behind walls, beneath floors or above ceilings. Symptoms guide the assessment but do not prove that pipework is leaking.
Google Reviews ★★★★★ 5.0 Rating 83 Reviews Read Reviews- Thermal Imaging
- Tracer Gas Detection
- Acoustic Detection
Non-Destructive Methods
Thermal imaging, tracer gas, acoustic detection and moisture mapping.
Coverage Across 7 Counties
London, Surrey, Berkshire, Buckinghamshire, Oxfordshire, Hampshire and Sussex.
Insurance Reports Available
Written findings and photographic evidence can support claim requirements.
What It Means
What Is Plumbing Leak Detection?
Plumbing leak detection is the process of locating concealed or uncertain leaks within internal domestic pipework. The source may be behind a wall, beneath a floor or above a ceiling even when the visible symptom appears elsewhere.
Specialist water pipe leak detection is different from general plumbing repair because it uses diagnostic equipment before disruptive access work begins. The aim is to narrow the likely source and reduce unnecessary damage.
Thermal imaging, tracer gas, acoustic detection and moisture mapping are used where appropriate to build a clearer picture of the leak route, affected areas and likely access point.
For broader support across internal, mains, heating and commercial systems, explore our complete leak detection services.
If you are still establishing whether water loss may be hidden, our guide to checking for a hidden water leak explains safe preliminary observations before an investigation is arranged.
Do You Need A Plumber Or Specialist Leak Detection?
People sometimes use the phrase "leak detection plumber" when the source of water loss is unclear. If water is visibly escaping from an accessible fitting or pipe, a plumber may be the appropriate first call. When the symptom continues but the source is hidden behind a wall, beneath a floor or above a ceiling, specialist plumbing leak detection may be needed before access or repair is planned.
Use mains water leak detection for an underground or meter-to-property supply pipe; central heating leak detection for boiler or sealed-system pressure loss; underfloor heating leak detection for a UFH circuit; and bathroom leak detection where shower enclosures, bath seals, grout or waste connections may be involved. This service is intended for concealed or uncertain leaks within internal hot and cold water pipework.
Where the evidence may indicate condensation, building water ingress or a concealed waste route rather than pressurised plumbing, a damp investigation or waste pipe investigation may be more appropriate. Use commercial leak detection for business, managed or commercial properties.
Symptoms
Common Signs Of A Possible Plumbing Leak
Damp beneath floorboards
Moisture beneath flooring may follow a concealed pipe route, although heating, waste and other sources should also be considered.
Unexplained internal water use
Water use that continues with outlets off may require checks to separate internal plumbing loss from an incoming supply-pipe leak.
Damp patch on a wall
New damp patches should be investigated before opening walls, floors or ceilings unnecessarily.
Water stains on ceilings
Ceiling staining can come from bathrooms, heating pipework, supply pipes or other concealed sources.
Water sounds with outlets off
Running or hissing sounds can justify further checks, but they do not confirm a concealed plumbing leak on their own.
Moisture that keeps returning
Recurring moisture after an area has dried may need investigation to distinguish plumbing loss from condensation or water ingress.
Floor-level symptoms can have several causes. Read how to check for a leak beneath a floor before lifting finishes or assuming the source.
Process
How We Investigate Suspected Plumbing Leaks
01
Initial Assessment
We review the symptoms, property layout, systems affected and any insurance requirements.
02
Leak Investigation
Methods are selected according to the system, symptoms and site conditions rather than using every technology on every visit.
03
Likely Location Identified
Findings are correlated to narrow the likely leak source and the area that may require targeted access.
04
Findings Provided
Photographs and written recommendations can support access planning, repair handover or insurance discussions.
What Happens After A Likely Leak Source Is Identified?
We explain the findings, photographs and likely affected area so targeted access can be planned. Written recommendations can then be handed to an appropriate repair contractor, with any post-repair checks arranged where the investigation indicates they may be useful. Opening-up, permanent repair, reinstatement and insurer approval remain separate unless specifically included in the agreed scope.
Findings reflect the systems that could be tested and the conditions present during the visit. Non-destructive methods can narrow a likely source, but targeted access may still be needed to confirm the exact defect.
Leak Types
Internal Plumbing Leaks We Investigate
Concealed hot and cold water pipework leaks
Leaks beneath internal floors
Leaks behind walls or above ceilings
Domestic hot water pipework leaks
Bathroom and appliance supply leaks
Internal leaks where the affected system is uncertain
Technology
Methods Used For Concealed Plumbing Leaks
Thermal Imaging May reveal temperature patterns that help assess concealed hot water movement and affected surfaces. 
Tracer Gas Can help establish a likely escape area where suitable pipework can be isolated and tested safely. 
Acoustic Detection May support location work on pressurised pipework where leak sound can be detected under site conditions. 
Moisture Mapping Helps record the extent and pattern of moisture so findings can be compared with pipe routes and other evidence. Investigation methods are selected according to the affected system, symptoms and site conditions. Not every method is used on every investigation, and no single technique guarantees an exact result in every circumstance.
Supporting Methods
Additional Investigation Techniques
Endoscopic Camera Inspection
Small inspection cameras are used to visually check concealed voids, pipe routes and difficult-to-access areas before opening up.
Dye Testing
Coloured test dye can help confirm water paths, waste leaks, bathroom leaks and suspected escape routes.
Pressure Testing
Controlled pressure testing helps identify whether sealed pipework or heating circuits are losing pressure.
Investigation Evidence
Hidden And Concealed Plumbing Leak Investigations
These published investigations show different symptoms, concealed locations and evidence-led methods used for internal domestic water leaks.
Abingdon, Oxfordshire
Concealed Plumbing Water LeakConcealed Water Leak Located After Damp Spread Across Walls in Abingdon
Spreading water marks led to a concealed plumbing leak area that was identified and marked for a suitably equipped plumber to access and repair.
Why it relates: Shows how spreading wall marks led to a concealed plumbing leak area that was identified and marked for repair access.
View case study
Iver, Buckinghamshire
Plumbing Leak InvestigationPlumbing Leak Investigation in Iver Rules Out Internal Water Systems
Heating, hot-water and cold-water circuits were tested after water ingress was reported below; no plumbing leak evidence was found during the visit.
Why it relates: Shows how testing can exclude heating, hot-water and cold-water circuits before the investigation moves to another possible source.
View case study
Camberley, Surrey
Hot Water LeakHot Water Leak Detection in Camberley
A reported hot water leak in Camberley was investigated using thermal imaging, tracer gas and acoustic detection methods.
Why it relates: Shows how several methods were combined to assess concealed domestic hot-water pipework and support targeted repair planning.
View case studyRelated Services
Related Leak Detection Services
01
Underfloor Heating Leak Detection
Specialist investigation for concealed UFH pipework, pressure loss and damp floor symptoms.
02
Mains Water Leak Detection
For meter-to-property supply pipes, underground leaks, running meters and external water loss.
03
Central Heating Leak Detection
For boiler pressure loss and concealed leaks within sealed central heating pipework.
04
Commercial Leak Detection
For businesses, managed properties and commercial buildings with wider stakeholder requirements.
05
Trace & Access
Leak tracing and access evidence for concealed pipework and insurance claim requirements.
06
Damp Investigation
Damp surveys and moisture mapping for water ingress and hidden leak symptoms.
Coverage
Areas We Cover
Plumbing leak detection surveys are available across London, Surrey, Berkshire, Buckinghamshire, Oxfordshire, Hampshire and Sussex for homeowners, landlords and residential property managers.
FAQs
Plumbing Leak Detection FAQs
Can you find hidden water leaks without opening walls or floors first?
We begin with non-destructive methods such as thermal imaging, tracer gas, acoustic detection and moisture mapping. These methods can narrow a likely source, but targeted access may still be needed to confirm the exact defect.
When is tracer gas used for plumbing leak detection?
Tracer gas is used where pipework can be isolated and charged safely. It can help locate concealed leaks that are not visible and cannot be confirmed by thermal imaging alone.
How does thermal imaging help locate water leaks?
Thermal imaging can show temperature patterns linked to hot water movement, heating pipework, damp areas or abnormal heat loss. It is used with other tests to build evidence.
How much does plumbing leak detection cost?
Cost depends on the property, system type, symptoms and investigation required. Contact us with the details and postcode so a specialist can advise the appropriate survey.
Can your findings support an insurance claim?
Yes. We can provide written findings and photographs that support trace and access or escape of water claim requirements. Your insurer decides what is covered.
Get Expert Help
Request Plumbing Leak Detection
Speak to a specialist about damp patches, ceiling stains, unexplained internal water use or suspected hidden hot and cold water pipework.
Phone: 0333 577 0194 WhatsApp: Message us Email: Use the contact form