We built our own house two years ago and moved in April 2008. We had the excavators back-fill after inspections. Since then the soil has been settling down to the point now I can see the top of the tar on the foundation. How long does this continue? It seems to have slowed down this past year, but it has messed up my plans of planting around my house. I want to put more dirt around the foundation to build it back up where it is suppose to be, but then I'd have to wait on that to settle. That is a lot of dirt. I'm debating on doing it myself or have the excavator come back in and do it for me.
Although the ground never finishes settling most settling will occur in the first 4 years. I suggest you fill in with dirt now and then again next season. Planting will help bind the dirt and can be started after this first fill.