[Youden]

Would it be possible to artificially create a seed that grows into a house or building?

[hoseja]

Most certainly yes. But the best way we currently have to get that seed is manufacturing environment that rewards building-shaped trees and waiting a couple million years.

[empyrrhicist]

Maybe if we ever figure out true, self replicating nanomachines.

[mellavora]

They already do.

Oh, wait, you mean a house for people. Sorry, my mistake.