Mould in the Home: What Every Parent Should Know

If you've got a baby or young child at home, that patch of black mould on the wall is more than an eyesore. Their lungs are still developing, and mould spores can make breathing problems worse. The good news is that most household mould is preventable once you know where it hides and why it keeps coming back.

Follow along as we walk through where mould loves to hide, how to tell the harmless kind from the serious stuff, and the simple changes that stop it coming back for good.

Why Mould Hits Children Harder Than Adults

Around one in 11 English homes has a damp or mould problem, according to the English Housing Survey. For adults, the odd patch of mould is rarely a big deal. For babies and toddlers, it's a different story because their airways are smaller and their immune systems are still building up. In fact, children living in a damp home are up to three times more likely to have breathing problems.

Exposure to mould spores has been linked to wheezing, asthma flare-ups and allergic reactions in young children. If your little one keeps getting chesty or their cough lingers for weeks, the air they're breathing at home is worth a closer look.

Where Mould Actually Grows

Most people check the bathroom ceiling and stop there. Mould is sneakier than that, and it tends to settle in spots you rarely look at. Common hiding places include:

• Behind wardrobes and sofas pushed against cold external walls
• Inside poorly ventilated cupboards and wardrobes where air can't move
• Under kitchen sinks where a slow leak goes unnoticed
• Around washing machine door seals, which stay damp after every wash
• In corners of rooms that don't get much heat

It's worth pointing out that these areas share one thing in common. They're cold, damp and starved of airflow, which is exactly what mould needs to take hold.

Surface Mould or Something Worse?

There's an important difference between the two types you'll come across. Surface mould sits on top of paint, sealant or grout, usually from condensation, and you can clean it off yourself with the right products. Penetrating damp is different. It comes through the wall from outside, often from a roof issue, broken guttering or rising damp, and it needs a professional to sort out the cause.

A quick rule of thumb: if the mould wipes away and the wall behind feels dry, it's likely surface mould. If the plaster feels wet, soft or stained even after cleaning, don't ignore it. That's when you call someone in.

How Surfaces Either Trap or Resist Mould

Here's something that catches a lot of parents out. The surface you're cleaning might be part of the problem. Painted plaster and grouted tiles both hold onto moisture, and grout lines in particular are tiny channels where spores settle and grow back no matter how often you scrub. That's why the same bathroom wall keeps going black every few weeks.

Non-porous, seamless materials behave very differently. A surface like today’s popular hygiene wall cladding is made from PVC that water simply can't soak into, and because it goes up in large sheets with sealed joints, there are no grout lines for mould to cling to. That's why it's standard in nurseries, hospital bathrooms and commercial kitchens, where surfaces have to stay clean and dry.

If you're stuck scrubbing the same patch over and over, cladding tackles the cause instead of the symptom, so the wall stays clean with a simple wipe down.

How to Stop Mould Before It Starts

Prevention beats cleaning every time, and it goes well beyond opening a window now and then. A few habits make a real difference:

Drying clothes indoors is one of the biggest culprits. A single wet load can release a litre or two of water into the air as it dries, and without ventilation that moisture lands on your coldest walls. If you must dry inside, crack a window or run a dehumidifier in the same room.

Your extractor fan matters too. A fan that's too small or clogged with dust won't shift the steam from a bath or shower, so check it's actually pulling air. Heating helps as well, because warm walls don't attract condensation the way cold ones do. The NHS suggests keeping rooms at a steady background temperature of at least 15 degrees, which works far better than blasting the heating for an hour and letting the house go cold.

Fix the Surface, Not Just the Stain

Mould in the home is common, but with a young family it's worth staying on top of. Learn the spots where it hides, deal with damp early, and think about whether the surfaces in your wettest rooms are helping or hurting. Get those three things right and you'll spend far less time scrubbing, and your children will be breathing cleaner air.