Damp flooring
Floor finishes may darken, lift or feel damp even when no pipework is visible.
Hidden Leak Symptom
Leak Under Concrete Floor
Leaks beneath concrete floors can be difficult to confirm without specialist non-destructive investigation methods.
A structured survey can help narrow the likely leak location before floors are opened, reducing disruption and supporting repair planning.
- Tracer Gas Testing
- Acoustic Detection
- Reduced Excavation
Causes
What Causes This Problem?
The underlying cause is not always visible. A structured investigation helps separate surface symptoms from the source of water escape.
Hidden pipework beneath a slab
Mains water supply pipe leak
Central heating pipe leak
Underfloor heating circuit fault
Failed joint or fitting below floor level
Pipe movement, corrosion or installation damage
Signs
Common Signs
Warm or cold floor patches
Temperature changes can sometimes indicate water movement or heating pipe faults below the floor.
Pressure loss
A heating system may repeatedly lose pressure if pipework beneath concrete is leaking.
Water meter movement
A meter that moves while water is off can indicate a concealed supply pipe leak.
Floor damage
Timber, laminate, tiles or screed may be affected by moisture escaping below the surface.
No visible leak
Leaks under concrete often remain hidden until symptoms appear elsewhere in the property.
Timing
When To Investigate
Before excavation
Leak detection should be carried out before floors are broken out unnecessarily.
Symptoms keep returning
Recurring damp, pressure loss or water usage can point to an unresolved concealed leak.
Insurance evidence is needed
Written findings and photographs can support trace and access or escape of water claims.
Investigation
How Leak Detection Helps
Targets the access area
Investigation narrows the likely leak position so repair work can be planned more accurately.
Identifies likely systems
Testing helps separate mains water, heating and underfloor heating leak symptoms.
Supports reporting
Evidence-led findings help property owners, contractors, insurers and loss assessors understand next steps.
Related Services
Recommended Leak Detection Services
01
Trace & Access
Leak location and reporting for insurance-led access requirements.
02
Mains Water Leak Detection
Investigation for underground supply pipe leaks and running water meters.
03
Underfloor Heating Leak Detection
Specialist UFH leak detection for pipework hidden beneath floors and screed.
04
Water Leak Detection
Non-destructive leak detection for hidden water leaks in homes and commercial properties.
FAQs
Leak Under Concrete Floor FAQs
How do I know if there is a leak under a concrete floor?
Common signs include damp flooring, unexplained pressure loss, water meter movement, staining or floor finishes lifting without a visible leak source.
Can you find a leak under concrete without digging first?
Non-destructive methods such as tracer gas, acoustic detection, thermal imaging and moisture mapping are used before excavation is considered.
What types of pipes leak under concrete floors?
Mains water supplies, central heating pipework, underfloor heating loops and concealed internal water pipes can all leak below concrete or screed.
Will the whole floor need to be removed?
The aim of leak detection is to narrow the likely leak location so any access work can be targeted rather than opening large areas unnecessarily.
Can findings support an insurance claim?
Yes. Written findings and photographic evidence can be provided where trace and access or escape of water evidence is required.
Get Expert Help
Request A Concrete Floor Leak Investigation
Tell us what symptoms you are seeing, the property type and postcode. A specialist can advise the most practical next step.
Phone: 0333 577 0194 WhatsApp: Message us Email: Use the contact form