Archviz blender tutorial part 2, adding the windows and doors and render the scene. *Note: There have been a couple of comments about exporting to other software (Unity, Unreal). I don't use those, but @ForsakenSanityGaming (thanks!) commented that before you export you should apply the modifiers (solidify first and then the boolean) on the walls and then delete all of the CTRL geometries that are created by doors and windows. Please note I haven't tried this myself (: