WINDOWS AND SHADES
See the free Add-ons items in the User Preferences area of Blender for the Archpack and Archimesh for built-in parametric windows and doors.
These windows and shades are via the free Archimesh plugin for Blender. These are some default settings objects, and you can easily change the blind angle, slat width and overall dimensions. Also, if you use the Archimesh room you can automatically cut the window holes into the wall using "Autoholes" (not used in this render) after selecting the room (the Autoholes parameter will appear after selecting the room.)