Not all plumbing leaks are obvious. While a burst pipe under the kitchen sink is hard to miss, many leaks develop slowly behind walls, under floors or beneath driveways, often going unnoticed for weeks or even months.

The longer a hidden leak is left unresolved, the greater the potential for water damage, mould growth and higher water bills.

If you’re a homeowner in Derby, here are seven warning signs that could indicate you have a hidden plumbing leak somewhere on your property.

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Unexplained Increases in Your Water Bill

One of the first signs of a hidden leak is a sudden increase in your water bill.

If your household water usage hasn’t changed but your bills continue to rise, water may be escaping somewhere within your plumbing system.

Even a small leak can waste thousands of litres of water over time, making it important to investigate unexpected increases.

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Damp Patches on Walls or Ceilings

Water leaking behind walls or above ceilings often leaves visible signs.

You may notice:

Discoloured patches
Peeling paint or wallpaper
Bubbling plaster
Dark water stains

These signs often indicate moisture is building up behind the surface.

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Musty Smells Around the Home

Persistent damp or mouldy smells can be another clue.

When water leaks into hidden areas, it creates the ideal conditions for mould and mildew to develop. Even if you can’t see any visible signs of water damage, an unusual musty odour may point to a leak.

Bathrooms, utility rooms and kitchens are common problem areas.

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Reduced Water Pressure

If you’ve noticed lower water pressure from taps or showers, a leak could be responsible.

Leaks reduce the amount of water reaching your fixtures and may affect performance throughout the home.

While low pressure can have other causes, it’s worth investigating if it appears suddenly.

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Wet Spots in the Garden

Leaks don’t always occur inside the property.

A damaged underground water pipe can create unusually wet patches in your lawn, even during dry weather.

You may also notice areas of grass growing faster or appearing greener than the surrounding lawn due to the extra moisture.

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The Sound of Running Water

Can you hear water running when no taps or appliances are being used?

This can be a strong indicator of a hidden leak.

Try turning everything off and listening carefully near walls, floors or pipework. If you still hear water moving through the system, it’s worth arranging a professional inspection.

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Cracks or Movement in Floors and Walls

Long-term leaks can gradually affect the ground beneath your property.

Over time, excess moisture may contribute to movement in floors, cracked plaster or even structural issues if left unresolved.

While not every crack indicates a leak, unexplained changes should always be investigated.

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How to Check for a Hidden Leak

A simple test involves checking your water meter.

Turn off all taps, appliances and water-using fixtures throughout the property. Then take a meter reading and avoid using water for a period of time.

If the meter continues to move, there may be a leak somewhere on the system.

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Why Early Detection Matters

The sooner a leak is identified, the less damage it can cause.

Early detection can help:

Reduce water bills
Prevent structural damage
Avoid mould and damp issues
Protect flooring and decorations
Reduce repair costs

What starts as a small leak today can become a major problem if left untreated.

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Final Thoughts

Hidden plumbing leaks are more common than many homeowners realise. By recognising the warning signs early, you can avoid costly repairs and protect your property from long-term damage.

If something doesn’t seem right, it’s always better to investigate sooner rather than later.

Need Leak Detection in Derby?

At RML Plumbing & Heating, we help homeowners across Derby locate and repair hidden plumbing leaks quickly and efficiently.

If you’ve noticed any of these warning signs or suspect a leak on your property, get in touch with our team today for professional advice and reliable service.