How to Spot a Hidden Water Leak in Your Home
Not all leaks are obvious. Some stay out of sight for weeks — even months — quietly damaging your walls, floors or electrics before you spot a sign.
At EPM, we deal with hidden leaks regularly across Exeter and the wider Devon area. And while they’re rarely dramatic at first, they can cause serious long-term damage if ignored.
Here’s how to recognise the early signs of a concealed water leak — and what to do if you suspect one.
Common Places Hidden Leaks Start
Hidden leaks often form in:
Underfloor pipework (especially in concrete screeds)
Behind washing machines or dishwashers
Under baths or shower trays
Inside airing cupboards or under cylinders
Loft tanks and overflow pipes
Central heating pipe joints hidden in walls or floors
Even a small, slow leak can damage timber, cause mould, and weaken structural materials if left unchecked.
6 Warning Signs of a Hidden Water Leak
1. Unexpected Damp Patches
You might notice discolouration, bubbling paint, or warped skirting boards — often with no obvious water source nearby.
2. Drop in Boiler Pressure
A constant drop in boiler pressure, especially in sealed heating systems, can point to a hidden leak under the floor or in the wall.
3. Mould or Musty Smells
If a room smells damp but there’s no visible water, it could be trapped behind walls or flooring. Bathrooms, kitchens, and utility rooms are most common.
4. Sudden Spike in Water Bills
If your water usage goes up with no change in habits, that could be a leak — especially in properties with water meters.
5. Warm or Cold Floor Spots
If the floor feels warm in a patch (underfloor heating leak) or cold and damp (freshwater leak), that’s a red flag.
6. Sound of Water Running
You can sometimes hear a faint hissing or dripping — especially at night when the house is quiet.
How We Find and Fix Them
At EPM, we use:
Moisture meters and damp probes
Acoustic listening equipment to pinpoint leak locations
Thermal imaging for warm water pipework
Trace and access methods that minimise disruption
Honest assessments to decide whether repair or rerouting is best
We’ve helped homeowners across Devon avoid full flooring rip-outs or ceiling replacements by acting early.
What It Might Cost
Depending on severity and location:
Leak detection: £500–£1200
Access and repair: Estimated once location is confirmed
Drying and restoration: Case-by-case (we can advise or refer as needed)
We’ll always give you a clear estimate and explain your options before work starts.
Final Word from EPM
If you’ve got signs of damp, dropping boiler pressure, or something just doesn’t feel right — don’t wait.
We’ll help find and fix hidden water leaks quickly and cleanly, so you avoid bigger problems down the line.
