I've been looking around at house/interior design programs to make some interesting scenes for Daz renders, as an alternative to using ready-made scenery. I came across Sweet Home 3D (http://www.sweethome3d.com/), which I thought I should share (and no, I have no affiliations to the project). It has a reasonably easy to use interface, and most importantly, it supports exporting the house and interior to .obj format, which can be readily imported into Daz. It also has a nice library of free objects available (http://www.sweethome3d.com/freeModels.jsp) and supports importing other formats as well, I think. The only major downside I could find is that the exported model does not create proper texture coordinates if no texture was applied to the object, so it gets a bit finicky if you want to apply Daz materials/shaders to untextured objects. And creating roofs is a bit hard...
Anyhow, I wanted to show some results I got while playing around with this program and getting it into Daz. If you're interested in more details on how to get this working, I'm happy to share, but for now I'll wait to see if people are interested in this kind of stuff .
So I went from this in Sweet Home 3D (don't mind all the weird textures):
http://i.imgur.com/UNnimZ4.png
To these renders with Iray in Daz: