Yup, it's expensive so generally only used in expensive projects. But it's a way of manufacturing land (or rather, saving land that would otherwise go for garag

Yup, it's expensive so generally only used in expensive projects. But it's a way of manufacturing land (or rather, saving land that would otherwise go for garages, storage, or other facilities that don't need windows). This makes housing cheaper because you then need to pay for less land per housing unit.