Can ordinary windows be changed into French windows?

Structurally, as long as it is not a shear wall structure, it can be changed. But there is a premise: if it involves changing the appearance of the building (you can't adjust the color of the building, the size becomes larger, and so on). ), it is estimated that it is not allowed to modify the property. In addition, the biggest certainty of floor-to-ceiling windows is the poor thermal insulation performance in winter. If you have to change it, make three layers of glass in the north and two layers of broken aluminum windows in the south.