Warmer inner glass
Double glazing keeps the inside pane warmer, so moisture is less likely to condense on it.
Why uPVC?
Streaming windows and damp rooms.
Condensation is warm, moist air meeting cold glass. Better-performing windows keep the inside of the glass warmer, so less moisture forms and the room stays drier.
Why it happens
Warm air, cold glass, wet sills.
Indoor air carries moisture — from cooking, showers, drying washing and simply breathing. When that warm, moist air meets a cold window pane, the moisture condenses on the glass and runs down to the sill.
The colder the glass and frame, the worse it gets. That’s why single-glazed and aluminium windows tend to stream the most.
- Streaming glass in the morning
- Wet, mouldy sills
- Musty, damp-smelling rooms
- Mould in the corners and on curtains
How better windows help
Warmer glass means less streaming.
Warm-edge spacers
An insulating spacer at the glass edge reduces the cold line where condensation usually forms.
Fewer cold frames
Insulating uPVC frames stay warmer than aluminium, so they don't sweat the way cold metal does.
The honest bit
A big step towards a drier home.
New double glazing makes a real difference to condensation — warmer glass means less moisture forming on your windows. Good ventilation and heating help too, and we'll point you in the right direction, but better windows are the place to start.
- Better glazing keeps the pane warmer
- Good ventilation moves moist air out
- Steady heating keeps surfaces above dew point
Good to know
Frequently asked questions
Will new windows stop condensation completely?
They help manage it, not eliminate it. Warmer glass and frames mean far less streaming, but ventilation, heating and how a home is used all play a part too — we’ll talk through the whole picture honestly.
Why do my windows stream in the morning?
Warm, moist indoor air meets a cold pane overnight and condenses. The colder the glass, the worse it gets — which is why single glazing and aluminium frames are the usual culprits.
Is condensation a sign of a bigger damp problem?
It can be. Persistent damp and mould are worth addressing properly. Better windows are part of the answer, alongside ventilation and heating.
Does retrofit double glazing help with condensation?
Yes — fitting double glazing into existing frames warms the inner pane and helps manage the streaming, without a full replacement.
Get started
Sick of wiping down the windows every morning?
Tell us about your damp or streaming rooms and we’ll come back with honest options to help manage it.