For the foundations, you're probably right. For the rest, some fundamentally new techniques may be employed. It is for instance possible to to extrude concret

For the foundations, you're probably right. For the rest, some fundamentally new techniques may be employed. It is for instance possible to to extrude concrete like you would plastic in a little 3D printer. Except your concrete extruder would typically be placed at the tip of a regular articulated robotic arm instead of a giant replica of a RepRap. (Edit: the technical term for this is "contour crafting".) Note however that what currently requires most human intervention isn't the heavy duty. It is all the small work you have to do after: paint, floor, electricity, water, basic appliances. To automate all that, you need to replace not only the human mind, you have to replace the human hand. Also replacing the human mind is obvious, though not necessarily easy: as you suggest, keep the machine, automate it, throw the human operator out. The human hand, on the other hand, will take some insight to be replaced: how will you lay out all the tubes and the wires ? You cannot really expect human-sized machines do the same work the humans currently do, in the same way. The best solution is probably to to come up with clever ways to render the human hand unnecessary. You could for instance blend heavy duty work with the rest, (laying out cable as you put the bricks together, or something), or somehow changing how things are done. But it looks like it could work.