In a larger SketchUp building design we need to add multiple floors. This is easily done, and we show you how in all our SketchUp training courses.
After the ground floor is completed, we would exit all groups and use the Rectangle tool to create a ceiling/floor for the next level – to do this simply click inside the walls from one corner of the floor to the adjacent corner. Then use the Push/Pull tool to extrude the floor upwards by whatever the height of this section should be, for example, a floor slab of 100mm. Then add a material if desired, and triple-click on the object to select all faces and edges, and right-click on it to Make Group. This will assist later when hiding the floor via the Layers panel.
Next we need to cut out any sections of the floor, for the stairs to appear, or for air conditioning duct-work, etc. We would do so by double-clicking to enter the group, then use the Line tool to draw the profile of the cut-out, and the Push/Pull tool to cut out the section. Lastly we create a new layer, name it Floor, and right-click on the floor object to choose Entity Info, and change the layer from 0 to Floor.
Next we double-click to enter the external walls group, and use the Push/Pull tool to extend the walls upwards by the required height of the first floor. This is often smaller than the ground floor height, for example 2.4m. At this point we would also cut out windows and balcony doors as before.
In this way we can keep adding floors to a building. It’s also possible to simply copy the ground floor upwards by the required number of floors, however we will get the ugly lines separating the floors, which will have to be hidden, as we did earlier with the internal wall seams.
Many useful tips and techniques can be found at the SketchUp website. And see many examples of our own clients’ work on our Facebook page.
Other related SketchUp Blog Posts:

• SketchUp background
• SketchUp introduction
• SketchUp modeling
• SketchUp contours
• SketchUp workspace