Rooms and surfaces

Green mould in kitchen cabinets: why it happens and what to do

Updated · 4 min read

Short answer: Green mould in kitchen cabinets is caused by trapped moisture — usually humidity, a slow leak under the sink, or poor airflow inside closed units. Remove affected items, treat the surface, fix the moisture source, and keep the cupboard ventilated to stop it returning.

What causes green mould in kitchen cupboards

Green mould in a cupboard means part of that cabinet has been staying damp. The colour isn't a warning sign in itself; mould can be green, black, white or grey, and the shade depends on the type and how far it has grown (our guide to what mould looks like covers the range). What matters is where the moisture comes from. In a kitchen it is nearly always one of three things: a leak, condensation on a cold wall, or steam with nowhere to go.

Where it grows tells you why

  • On the base of the under-sink cupboard, often with a tide mark or a swollen edge: water is dripping from the trap, a tap connector or an appliance hose.
  • On the back panel of a unit fixed to an outside wall: the wall is cold and moisture is condensing behind the contents.
  • Inside wall units above the kettle, hob or dishwasher: steam rises into the cupboard and settles on the shelves and the underside of the top.
  • On the side panels next to the dishwasher or washing machine: warm, damp air escaping when the door opens, or a seal that has started to leak.
  • On the food rather than the cupboard, such as bread, fruit or opened packets: something was stored damp or kept too long, which is a storage issue more than a building one.

Mould on a back panel with no sign of a leak isn't a mystery: mould can grow without a leak wherever warm, moist air meets a cold surface.

Clearing out a mouldy cupboard

Empty the cupboard completely. Bin any food with visible mould and anything in cardboard or paper packaging that was touching it; unopened cans and glass jars only need a wipe. Open the window, put on gloves and a mask, then wipe the inside with a damp cloth and a mould cleaner, working from the cleanest areas towards the worst. Don't brush the mould off dry, and don't combine cleaners. Household remedies get mixed reviews, so read what vinegar can and can't do before relying on it. Leave the doors open until every surface is completely dry before you restock.

Is the cabinet still sound?

Most kitchen units are made from chipboard or MDF with a laminate or foil face. The face cleans well, but raw edges and the board inside soak up water. Press the base and the lower edges of the panels: if they feel soft, have puffed up, or the laminate is lifting, the board has absorbed water and mould can carry on inside it. A swollen base or back panel can often be replaced on its own without changing the whole kitchen. Solid wood and painted doors usually clean up well if they're dried properly afterwards.

Keeping cupboards dry

Fix any drip under the sink first, and make a quick look there with a torch part of your routine. Run the extractor or open a window while cooking and boiling the kettle, and avoid opening a steaming dishwasher directly beneath a wall unit. Leave a little space between packets and the back panel of cupboards on outside walls so air can circulate. Wipe up spills inside cupboards straight away. A small moisture absorber in a problem cupboard can help, though it won't keep up with a leak.

Cyprus kitchens bring their own pressures. Apartments closed up between visits have no air movement for weeks, so a slight weep under the sink has time to spread unnoticed. In winter, cupboards on north-facing outside walls stay coldest and are the first to show growth. For a wider look at the room, see the kitchen's other hidden hotspots.

When it keeps coming back

If a cleaned cupboard turns green again within weeks, or you can't find the source, the moisture may be in the wall or under the units. Before any growth is touched, the moisture feeding it is traced, so the fix lasts. A moisture check behind your kitchen units includes readings in every affected room and a written report with the quote. Typical fixes include upgrading the extractor or insulating the cold spot, then finishing in an anti-mould coating, and treating the cupboard and wall surfaces is usually one visit with no building work.

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Common questions

Is green mould in kitchen cabinets dangerous?
It's a hygiene and moisture concern, especially near food. It's usually treatable, but the moisture source must be fixed or it returns. Discard any mouldy food packaging.
Why is there mould under my kitchen sink?
Almost always a slow leak or condensation keeping the base damp. Check pipes and the cupboard floor for water staining and softness.
How do I get rid of mould in cupboards for good?
Remove mouldy items, clean and treat the surface, fix the moisture source (leak, condensation or humidity), and keep the cupboard ventilated and dry.
Can I still use a cupboard that had mould?
Once it's properly cleaned, treated and dried, and the moisture source is fixed, yes. If the unit is water-damaged or mould keeps returning, it may need professional treatment.
Why is the mould in my cupboard green rather than black?
Different moulds grow in different colours, and the same mould can change shade as it grows, so green doesn't mean it is safer or worse than black. Colour can't tell you the type without a lab test. Treat any cupboard mould the same way: clear it out, clean and dry the surfaces, and find the moisture behind it.
Do I need to throw away plates and pans from a mouldy cupboard?
No. Glass, ceramic and metal items can be washed in hot soapy water or the dishwasher and dried fully before you put them back. Wooden boards and utensils are more porous, so replace them if mould has got into the grain. Don't return anything to the cupboard until the cupboard itself is clean and dry.

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