Condensation or ‘steamed-up’ glass can occur when the seal breaks down on the double glazing unit, but sometimes we can be fooled by condensation and cold weather. A failed or condensated double glazing unit will have moisture on the inside of the glass unit which cannot be wiped off. Also, if possible, check the outside of the window as new energy-saving double glazing allows condensation to form on the outside of the glass on cold mornings, which can be wiped off. This is normal and does NOT need replacing. Only moisture inside between the glass that cannot be wiped off should be replaced.

If you have condensation forming on the glass, window frame, and surfaces around the window, it may be because there isn’t enough ventilation in the house or room. This is very common in bedrooms.

This can be a particular problem in winter when it’s cold outside and warm in your home. The moisture collects on cold surfaces, such as glass and walls.

To reduce it, make sure you let fresh air into rooms as much as possible. You can also consider installing ventilation, such as air bricks, extractors, or vents in window and door frames.

Trickle vents can often be added to existing double-glazed windows to allow some fresh air in without letting the heat in your home escape. You can open and close them as you wish.

If vents aren’t an option for you, consider investing in a dehumidifier. Try avoiding drying clothes on radiators, and keep bathroom and kitchen doors closed to avoid letting steam and moisture into the colder rooms of the house.

Damp and water leaks will cause damp and condensation problems in your home.