The information in this article applies to:
I've noticed that the rooms on Floor 1 of my plan have a floor height of 0", and that this is not the same height as the terrain, which is also set at 0". Why is that?
In the real world, floor platforms are nearly always built so that you step up into a building. There are a number of reasons for this, but perhaps the most important is to prevent the structure's framing from coming into contact with the terrain. Over time, exposure to moisture in the soil can damage or even ruin untreated lumber in a framed floor platform or wall. For this reason, building codes in most areas require that floors be raised off the terrain.
Home Designer programs automatically raise the floor platform off the terrain for you. The amount that the floor is raised depends on the type of foundation you have built in your plan:
In Home Designer version 7 and newer programs, you can specify a different distance between floor and terrain.