Keeping your home free from condensation and mould

Everyday things like cooking, washing, bathing and even breathing cause moisture, which is released into the air.

Condensation can cause black mould on walls, furniture, clothes and curtains. The mould looks bad and can even damage your health - medical research has found links between mould, house dust mites and illnesses of the throat and lungs. The damp left by condensation will also damage plasterwork and timber windows.

What is condensation and what causes it?

Everyday things like cooking, washing, bathing and even breathing cause moisture, which is released into the air. The air can only hold a certain amount of water vapour - the warmer it is, the more it can hold. If this is cooled by contact with a cold surface such as mirror, a window or even a wall, the water vapour will turn into droplets of water - condensation. This is what happens when the mirrors mists up in the bathroom.

What does condensation look like?

Every home gets condensation at some time - usually when lots of moisture and steam are being produced such as bath times, when cooking meals or washing clothes.

Fish tanks and indoor plants can also give rise to large quantities of moisture in the air.

It is quite normal to find your bedroom windows misted up in the morning after a cold night, which is to be expected and is not indicative of a serious condensation problem.

If your home never seems to be free from condensation, or you have mould growth as well, read on.

What can you do to reduce it?

1. Produce less moisture

  • Dry your washing outside the property whenever you can. You can also hang it in the bathroom, keeping the door closed and the window wide open.

  • Never use portable gas bottles or paraffin (flueless) heaters.

  • Permanently vent your tumble drier to the outside of your home, using a suitable kit recommended by the manufacturer of the appliance.

  • While cooking, always cover pans and don't leave kettles boiling.

2. Ventilate well to remove moisture

  • When a room is in use, keep a small window and/or a trickle vent open

  • Ventilate bathrooms and kitchens.

  • Keep bathroom and kitchen doors closed even if they have extractor fans.

  • Ventilate cupboards and wardrobes - do not overfill wardrobes - let the air circulate freely inside. For the same reason, cut holes in the back panel of the wardrobe and move it 50mm away from the surrounding wall. If possible, locate wardrobes against internal partition walls.

3. Insulate and heat your home

  • Keep your home warm with insulation, draughtproofing and heating: this reduces the risk of condensation.

  • A constant, low-level form of heating provides the most economical form of heat and reduces the likelihood of condensation.

How to help yourself

  • Treat and remove the mould - there are various products on the market that will help such as fungicidal products available in DIY stores.

  • Wipe down windows, frames and other affected areas with a fungicidal (mould-killing wash) that carries a Health and Safety Executive 'approval number'. Make sure you follow the manufacturer's instructions precisely. Dry-clean mildewed clothes and shampoo mouldy carpets.

  • After treating mould-affected areas, redecorate using a good-quality fungicidal paint. Where possible remove lining paper and wallpaper, treat the plaster and then paint or paper the area again.

  • There is a balance between heating and ventilation and a dehumidifier may help. Please contact us if you require any further help or assitance.

Where to find assistance with heating

For free energy efficiency advice, please contact Actio2n Surrey on 0800 783 2503, or visit

Age Concern

Age concern produce a number of useful factsheets including 'Help with heating' and can offer telephone advice for older people. You can contact them on freephone 0800 009 966 between 7am and 7pm.

British Gas

British Gas provide some useful hints and tips on how to reduce your energy bills and help protect the environment.

  • Make your home more efficient with their free energy efficiency home audit.

  • Review their range of energy efficient products.

  • Learn how you can make significant savings on your energy bills.

Eaga Partnership

This organisation provides grants and advice on how to reduce your fuel bills, keep your home warm and free of damp and reduce carbon dioxide emissions through lower energy use. You can contact them on0800 316 2808 or email.

Energycare Network

A SEEBOARD funded initiative providing grants and discounts for loft and cavity wall insulation. Grants are 100% if you are over 60 and on benefits, 80% if you are over 60 and not on benefits and 50% if you are under 60. Call 0800 389 1945 to find out if you are eligible.

SEEBOARD Energy Efficiency Advice Service

For advice on the efficient use of energy call 0800 581 255 between 8:30am and 4.30pm Monday to Friday.