German phrase
Sind ~ doppelt verglast?
Meaning
Are ___ double-glazed?
When to use it
Checks for double glazing. It is a direct, polite question about windows or doors.
Example dialogue
Sind die Fenster doppelt verglast?
Are the windows double-glazed?
Ja, die sind alle doppelt verglast.
Yes, they are all double-glazed.