A YouTube builder going by the channel name 'Hype Building' has revealed one simple and affordable way to tell if damp and mould are getting worse in your home.

John, a builder from Fenton, is a damp expert and has been able to put his skills to good use when investigating mould that has no obvious cause.

When visiting a recent property, John was quick to note that the main signs of dampness include wet patches on walls where mould starts to form.

However, it was found that the damp in this particular property was not caused by poor ventilation or pipes but was instead the fault of water trickling down the side of the wall from a broken chimney cowl.

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A chimney cowl is typically fitted to the outside of a property to stop rain from entering the building.

Before finding the cause, John praised the homeowner for one "smart" and simple trick to see if the dampness and mould were getting worse.

One 'smart' trick to seeing if damp and mould are getting worse in your home

Mould is a nuisance to households across the UKMould is a nuisance to households across the UK (Image: Getty Images) The simple trick involved the homeowner using a pencil to mark out where the damp ended.

This helped John work out how much the damp had spread with the expert explaining: "What the owner has actually done that is quite smart, is that they have drawn pencil marks to show where the damp was ending, so they can monitor if it's getting worse or not. That's smart, I like that because that helps me."

With John completely sure the problem was getting worse, he set out to eliminate the causes.