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Black Mould in Bathroom

Dark mould growing on ceiling, walls, grout, sealant, or around the window in the bathroom.

What Is Causing This?

  • 1Poor ventilation allowing moisture to linger
  • 2No extractor fan or an ineffective one
  • 3Cold surfaces creating condensation points

How Urgent Is This?

Fix Soon

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 professional cleaner will treat the mould with specialist anti-fungal products and deep-clean all affected surfaces. Improving ventilation is essential to prevent return.

How Much Will It Cost?

£111 – £279

National average estimate

Labour: £97 – £240 | Materials: £14 – £39

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Prices are estimates based on typical UK rates. Actual costs depend on the specific issue, accessibility, and your location. All quotes from tradespeople on Tradesfolk are completely free.

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How to Prevent This

Run the extractor fan during and after showers. Open windows when possible. Wipe down wet surfaces. Address any ventilation issues.

Related Problems

Mould on Bathroom Ceiling

Black or dark green spots spreading across the bathroom ceiling, sometimes extending down the walls.

Grout Turning Black

Grout between tiles turning dark grey, black, or developing visible mould spots, especially in wet areas.

Stubborn Limescale in Bathroom

White, chalky deposits building up on taps, shower screens, tiles, and around plug holes.

Other Cleaner Problems

Stubborn Limescale in Bathroom

White, chalky deposits building up on taps, shower screens, tiles, and around plug holes.

Grease Build-up in Kitchen

Sticky grease film on kitchen surfaces, extractor hood, tiles, and cupboard doors near the cooker.

Carpet Stains Not Coming Out

Persistent stains on carpets from spills, pet accidents, or tracked-in dirt that domestic cleaning cannot shift.

Hard Water Marks on Glass

Cloudy white marks and streaks on glass shower screens, mirrors, or windows from dried water droplets.

Frequently Asked Questions

What causes black mould in bathroom?
Poor ventilation allowing moisture to linger. No extractor fan or an ineffective one. Cold surfaces creating condensation points.
Is black mould in bathroom serious?
This should be fixed in the coming weeks. Leaving it may allow the problem to worsen and cost more to repair.
How much does it cost to fix black mould in bathroom?
Typical costs range from £111 to £279 depending on severity and location. Get a free quote from a local cleaner on Tradesfolk.
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