A reasonable indication is about $450 per square metre, dependent on the kind and size of one's windows, and your place. However, some types of glazing, like double hung Home windows, and clerestory windows will cost additional. There exists a Do it yourself alternative which may be extra reasonably priced. https://josuehetft.ivasdesign.com/58136914/the-smart-trick-of-acoustic-secondary-glazing-that-nobody-is-discussing