These guys are building small houses with a thing that prints in layers just like a home 3D printer, using mortar instead of plastic. https://www.youtube.com/watch?v=wCzS2FZoB-I It looks like there's manually placed metal mesh for reinforcement.

Dunno what the quality's like, but it's there. It does seem like it would be tricky to scale to structures larger than the practical footprint of their printer, but maybe the thing could be mounted on wheels.