ᐅ Condensation on window frames in a newly built home from 2023
Created on: 22 Feb 2026 16:58
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UbibubiHello everyone,
I have a question regarding roller shutter boxes/windows. Our house is a single-family new build from 2023. This past winter was the first really cold one. When nighttime temperatures dropped below -10°C (14°F), we noticed condensation around the corners of the window frames on the north and east sides (where the cold wind mainly came from), right under the maintenance hatch to the roller shutter box. I also held my hand near several of the affected windows and could feel a very slight draft. Since the first two years were never this cold before, we hadn’t noticed this until now, and there was no condensation previously. Now that temperatures have gone back up to around 0°C (32°F) and above, the condensation is no longer visible.
I contacted our construction company with the attached photos, and they sent a window installer to take a look. He said that this is completely normal with today’s building methods and no action is needed, and that no mold will form. The only thing he suggested was applying a silicone seal along the corners to stop air from coming through. I was surprised by these statements but didn’t have the expertise and accepted the explanation for now. I wanted to ask here for independent advice.
Is this really normal for modern houses? Even though the roller shutter boxes themselves are insulated? By the way, we did not perform a blower-door test before moving in because I planned to have it done through acquaintances, but the software failed on that day. I don’t know if this issue would have been detected then. If this behavior at the windows is really normal, probably not?
I have a question regarding roller shutter boxes/windows. Our house is a single-family new build from 2023. This past winter was the first really cold one. When nighttime temperatures dropped below -10°C (14°F), we noticed condensation around the corners of the window frames on the north and east sides (where the cold wind mainly came from), right under the maintenance hatch to the roller shutter box. I also held my hand near several of the affected windows and could feel a very slight draft. Since the first two years were never this cold before, we hadn’t noticed this until now, and there was no condensation previously. Now that temperatures have gone back up to around 0°C (32°F) and above, the condensation is no longer visible.
I contacted our construction company with the attached photos, and they sent a window installer to take a look. He said that this is completely normal with today’s building methods and no action is needed, and that no mold will form. The only thing he suggested was applying a silicone seal along the corners to stop air from coming through. I was surprised by these statements but didn’t have the expertise and accepted the explanation for now. I wanted to ask here for independent advice.
Is this really normal for modern houses? Even though the roller shutter boxes themselves are insulated? By the way, we did not perform a blower-door test before moving in because I planned to have it done through acquaintances, but the software failed on that day. I don’t know if this issue would have been detected then. If this behavior at the windows is really normal, probably not?
Ubibubi schrieb:
and they sent a window installer to take a look. He said that with today's construction methods this is completely normal, there’s no need for action, and no mold will develop. Sorry, that is simply nonsense. With modern building techniques, you might at most get slight moisture on the bottom of the glass on large window surfaces. What you are showing is a serious problem—poor workmanship, insufficient insulation, incorrect installation, or something similar.
Ubibubi schrieb:
He said he could at most apply a silicone seal around the corners to stop the air from coming through. From the start, the windows should have been installed with frames designed so that no air can pass through at all. That is how modern construction works, not this leaky mess.
Ubibubi schrieb:
Is this really normal in modern houses? No.
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