How do I stop black mould growth on my bedroom wall?

Black mould on your bedroom wall isn’t just unpleasant – it can affect your sleep, your health, and even the value of your home. It’s one of the most common complaints we hear from homeowners, especially during colder, damper months.

So, if you’re wondering, “How do I stop black mould on my bedroom wall?”, you’re in the right place. Let’s walk through what causes it – and more importantly, how to get rid of it for good.

What causes black mould in bedrooms?
Black mould is usually a sign of excess moisture and poor ventilation. Common causes include:

• Condensation from breathing, radiators, or drying clothes
• Poor airflow in corners or behind furniture
• Cold external walls that attract moisture
• Leaky windows or roofs
• Rising damp or penetrating damp in older properties

Bedrooms are especially vulnerable because we spend hours sleeping with windows closed – which means moisture builds up overnight.

How to stop black mould on your bedroom wall
Stopping black mould means dealing with both the visible problem and the hidden cause. Here’s a step-by-step plan:

1. Clean it (safely)
If the mould is limited to a small area:

• Wear gloves, a mask, and eye protection
• Use an anti-mould spray or white vinegar
• Wipe the area gently with a disposable cloth
• Never dry brush or hoover mould – this spreads spores into the air

⚠️ Note: If the mould covers more than 1m², or keeps coming back, call a professional – especially if there’s a damp smell or signs of structural damp.

2. Improve ventilation
You need fresh air to stop condensation:

• Open windows for at least 10 minutes daily
• Use trickle vents if your windows have them
• Leave bedroom doors slightly ajar at night
• Don’t block air bricks or wall vents

3. Reduce moisture in the room
Too much humidity fuels mould. Try:

• Avoiding drying clothes indoors
• Keeping furniture away from external walls to let air flow
• Fitting extractor fans in nearby bathrooms

4. Insulate cold walls
Cold walls attract moisture. If possible:

• Add insulation to external bedroom walls
• Use thermal wallpaper or insulating paint
• Ensure loft insulation is up to standard

5. Fix the root cause
Sometimes, mould is just a symptom of a bigger issue. You may need to:

• Repair leaking gutters, roofs or windows
• Investigate for rising damp or hidden pipe leaks
• Get a professional damp survey if unsure

So, how do you stop black mould on your bedroom wall?

Clean it carefully, improve airflow, reduce moisture, and – most importantly – fix whatever’s causing it to return.

Article Author

Scott Evans

Scott Evans is the founder and CEO of Dwelling Doctors