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Why do my new windows have condensation on the inside?
We’ve recently had new windows fitted and I’m surprised to see condensation on the inside. Is this normal with new windows? Or does it point to a serious problem?
Expert Trade Answers
"Hi Robert
The two pieces of glass have a seal around them and there is usually an inert gas between the two pieces of glass which stops condensation building up
The reason you have condensation is the seal is broken and The Gas has escaped
The solution is to replace the glass unit
I hope you find this helpful best regards, Cliff"
The two pieces of glass have a seal around them and there is usually an inert gas between the two pieces of glass which stops condensation building up
The reason you have condensation is the seal is broken and The Gas has escaped
The solution is to replace the glass unit
I hope you find this helpful best regards, Cliff"
Answered on 18th Jan 2026 - Member since Dec 2025 -
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"The glass is very cold, so when warm air touches it, the moisture in the air changes into water. That’s why you see water drops on the outside. It’s not leaking from inside the glass.”"
Answered on 18th Jan 2026 - Member since Jun 2025 -
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"Hi do your new windows have trickle vents ? Are they open ?
House ,bungalow or flat ?.
You should check with your installers .
Do you adequately vent your living space ?
What type of hearing have you got ?
Etc
More info required"
House ,bungalow or flat ?.
You should check with your installers .
Do you adequately vent your living space ?
What type of hearing have you got ?
Etc
More info required"
Answered on 18th Jan 2026 - Member since Jul 2025 -
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"Ask the fitter or company that fitted them as the glass may have been installed back to front or there is not enough air flow."
Answered on 18th Jan 2026 - Member since Apr 2025 -
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"There maybe a few causes to having condensation to the inner pane
1) lack of ventilation do the new windows have trickle vents
2)Do the new double glazed units have a thermal coating ( the installer may have glazed them with the coating to the outside )
3) Do you have radiators directly underneath the windows and are you drying clothes on the radiators
If so this will cause condensation to any window"
1) lack of ventilation do the new windows have trickle vents
2)Do the new double glazed units have a thermal coating ( the installer may have glazed them with the coating to the outside )
3) Do you have radiators directly underneath the windows and are you drying clothes on the radiators
If so this will cause condensation to any window"
Answered on 18th Jan 2026 - Member since Jun 2025 -
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"Humidity in doors basically, you need some ventilation, check trickle vents, and open window slightly if needed. Your windows are working. Best, Tim"
Answered on 18th Jan 2026 - Member since Sep 2024 -
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"It is usually down to your heating the windows will settle down after a little while but you have to have your heating at the correct temperature"
Answered on 18th Jan 2026 - Member since Jun 2021 -
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