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Could you grow a house?
Could you print a scaffold in the shape of a house, and then use the same techniques discussed in Anthony Atala's TED Talk http://www.ted.com/talks/anthony_atala_printing_a_human_kidney.html to coat the scaffold with tree cells? Possibly spraying it on as seen on this video: http://www.youtube.com/watch?v=eXO_ApjKPaI
Keeping the structure alive would of course require a root structure. Perhaps one that already exist, or one that is fabricated in a similar manner. Imagine durable, self sustained, self repairing, eco friendly structures.