Mould on Bathroom Ceiling
Black or dark green spots spreading across the bathroom ceiling, sometimes extending down the walls.
What Is Causing This?
- 1Poor ventilation allowing moisture to build up after showers
- 2Extractor fan broken, undersized, or not installed
- 3Cold surface temperatures creating condensation
How Urgent Is This?
This should be fixed in the coming weeks. Leaving it may allow the problem to worsen and cost more to repair.
What Needs to Be Done
A decorator will treat the mould with a fungicidal wash, allow the surface to dry, and repaint with anti-mould paint. Improving ventilation is essential to prevent recurrence.
How Much Will It Cost?
National average estimate
Labour: £575 – £1,700 | Materials: £108 – £455
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Ask a QuestionHow to Prevent This
Run the extractor fan during and for 15 minutes after every shower. Open windows when possible. Use anti-condensation paint in bathrooms.
Related Problems
Visible moisture, water droplets, or damp patches on the underside of the roof felt or rafters in the loft space.
Dark mould growing on ceiling, walls, grout, sealant, or around the window in the bathroom.
White ceilings gradually turning yellow or brownish, particularly noticeable in kitchens and bathrooms.
Other Painter & Decorator Problems
Paint flaking, bubbling, or peeling away from interior or exterior walls in sheets or patches.
Fine or wide cracks appearing in the paint on the ceiling, sometimes with flaking edges.
A persistent discoloured patch on an interior wall, often yellowish or brownish, that may feel damp to the touch.
Wallpaper lifting at the edges, seams, or in patches, sometimes curling away from the wall.