Alex Le Roux 3d printed what he calls a "first 3D printed livable house in the United States". I would say it's a garden shed. You decide.
It was done on a Vesta machine:
Vesta concrete 3d printer costs USD 8,999.00 and has 10ft x 10ft x 10ft build volume.
Project blog:
http://concreteprinter.tumblr.com/
Vest printers homepage:
http://www.vestaprinter.com/