Blender News: A new interior design addon for Blender is being developed that uses parametric models. Pretty darn cool for concepting or for people who can't model. 
Interior Design with Blender
Interior Design with Blender
I want!
I think I've fallen in love.
I mean, the appliances and stuff are nice, but the walls.....
If you are interested in the backstory about the project, you should look at the other video on that channel. It's a little interesting. More importantly, the actual addon
.. will be free for private and commercial use.
Woohoo!