What is condensation?

Condensation is caused when warm moist air from inside a building meets a cold surface such as a window or wall.

Our condensation leaflet gives you more information about condensation:


How can I reduce condensation?

  • Do not use unvented or portable gas, oil or paraffin heaters, because these produce too much water vapour as the fuel burns. Each litre of paraffin burned releases one litre of water vapour into the atmosphere. Using bottled gas produces even more
  • Avoid drying clothes in your house. If this is not practical then the door to the room where the clothes are drying should be kept closed and the room ventilated to the outside
  • Avoid drying clothes on radiators
  • Keep doors closed when you are cooking, washing or bathing. This prevents moist air circulating throughout the house. Ventilate the room by using the extractor fan or by opening a window
  • Keep furniture, such as beds and wardrobes clear of the walls to allow air to circulate
  • Vent your tumble driers to the outside
  • Keep your house warm. In cold weather leave the heating on and heat all rooms. Moisture does not condense in warm air. Using background heating and trickle ventilation, especially in winter, will also reduce condensation
  • Keep air vents clear