well, there was the one about eating a giant marshmallow, so this is pretty much the same idea. You are going to find out that your house is made out of dirt, or maybe just your stairs. perhaps, this is all a dream and you will wake up to find yourself in the hospital. whatever the case, don't panic.
It could mean that you are about to take a decision in your life which you might think is bad but could end up one of the best decisions you take in your life!!
Dirt is associated with uncleaniness. Stairs either bring you up or down, from one level to another. Usually steps are wood or metal, a secure stable product, dirt is not. It could mean that you are taking a direction in your life that is not stable and may be the wrong direction. Dirt symbolizes immorality. You may have to "clean" up the path you take.