Mark's assumption on no settling is kinda dependent on soil type and the size of the footers. Footers with large footprints will settle less than minimum sizes set to just meet local code. If bedrock is readily available at some reasonable depth in your site cushion the footers with some crushed rock and you have a no settle situation. If the subsoil is mostly clay then BIG footprints are really necessary with ratios on the order of 8 to 1 rather than the "normal soil" (whatever that is) on the order of 4 to 1. This ratio is the lower mean diameter of the footprint to the diameter of the top on which you place the sill plate/posts. My present home with a full concrete foundation (6" walls) has 24" footers and it has settled more than 2" in 28 years. This was the code standard at the time it was built (No, I was not the buiilder). My adjacent deck (6" posts) has 40" footers in the same clay and it has not moved in 22 years. I built this one.
Work safe, have fun.
