Stilts or Slab, which costs more?

[James Morris]

I have a property on lake Travis that I would like to build. The main obstacle is that the lot is  nearly 20' below the floodplain and would require some significant stilts. There are many houses built this way in the area, but do any of you here on BP have any experience with homes built on stilts; pros cons cost difference from a normal slab? The size of the home would only be around 1600 sq ft. and I am looking at going with a basic rectangular shape. Any one that has built one in the austin area, or anywhere for that matter? Any help/ advice/ tips would be much appreciated!