How to Get Rid of Mould on a Bathroom Ceiling

Black mould on a bathroom ceiling is almost always a steam and ventilation problem: hot showers fill the room with moisture, it condenses on the cool ceiling, and mould grows. Clean it off, fix the ventilation, and it stays gone.

General guidance. Recurring bathroom ceiling mould usually means extraction needs improving. A spreading brown stain may be a leak — investigate that separately.

Why it happens

Every shower releases a lot of steam. The ceiling is often the coolest surface in the room, so moisture condenses there. Without effective extraction, that moisture lingers, the surface stays damp, and black mould takes hold — classic condensation.

Step by step

1. Ventilate and protect yourself

Open the window or run the extractor, and wear a mask, goggles and gloves.

2. Clean the mould off

Wipe with a mould remover or mild detergent on an extendable handle, then clean water, then let it dry. (See how to get rid of mould on the ceiling.)

3. Improve extraction and ventilation

Run the extractor fan during and after showers, open the window, and keep the door shut while showering so steam is removed at source rather than spreading through the home.

4. Reduce steam and warm the ceiling

Cooler, shorter showers help; wipe surfaces afterwards; and improving insulation above the ceiling raises its temperature so moisture is less likely to condense.

5. Treat and repaint

Once the cause is under control, finish with a mould-resistant bathroom paint to help prevent regrowth.

If it keeps coming back

Persistent bathroom mould nearly always means the extraction isn’t coping — an underpowered, poorly sited or unused fan. Upgrading ventilation is usually the answer. If you suspect a leak instead, get it checked by an independent damp and mould surveyor.

Renting? Inadequate bathroom ventilation is a building issue for your landlord to address — see your rights as a tenant.

Frequently asked questions

How do I get rid of mould on my bathroom ceiling?

Ventilate and protect yourself, wipe the mould off with a mould remover or mild detergent on an extendable handle, dry the ceiling, then fix the cause — better extraction and ventilation, less steam, and a warmer ceiling — before repainting.

Why does my bathroom ceiling keep going mouldy?

Showers produce steam that condenses on the cool ceiling. Without good extraction it lingers, keeps the surface damp, and feeds mould. The fix is removing that moisture at source, not just cleaning the mould.

Will an extractor fan stop bathroom ceiling mould?

Good extraction is the single most effective measure — run it during and after every shower. Combine it with opening the window, keeping the door shut while showering, and improving insulation for the best result.

What paint stops mould on a bathroom ceiling?

Mould-resistant bathroom paints help as part of the fix, but only once the steam and ventilation problem is addressed. Painting over mould without that simply delays its return.