The current technology is perhaps impractical, but it will get better with time. Some advantages of having a building built by a machine are a) the skills of y

The current technology is perhaps impractical, but it will get better with time. Some advantages of having a building built by a machine are a) the skills of your workers are no longer a constraint on building geometry and b) machines don't care if the houses are all the same or all different, so individual customization is cheaper. What follows from b) is that it would be less difficult/expensive to customize a house to match the constrains of its site, which is currently hard when dealing with non-flat, non-rectangular lots. One could even generate building designs algorithmically according to some heuristics. My prediction is that if house-building robots take off, we'll see a lot of co-evolution between the machines and architectural design software.