High quality plastic coated insulated double pane windows are available with 1-4 panes. The windows come either fixed or operational.
The building package contains all needed mouldings and other supplies for finishing. The perfect fit of mouldings and other supplies is guaranteed when they are delivered in one complete package.
It is also possible to use PVC or polycarbonate panel windows. These are cheaper then insulated double pane windows but still allows for light and visual appearance benefits. In sum, the building package contains all the materials that are needed for your building from; eaves overhang finishing to window trimmings.