Thing with prefab is it's been tried many times before, and hasn't succeeded. Why? Most companies take traditional construction methods, and simply move them into a factory where there's cheaper labor. But then the assembly process and on-site finish work is laborious and expensive (in this case, 70%+ of costs). For prefab to succeed, there needs to be a ground up redesign of the entire building process, from design and engineering to manufacturing and assembly, with software at the core to enable a system that's scalable and allows for different designs across numerous projects, and with the actual building to be made of parts that truly click together like legos. YC F3 company Cover (i'm a founder) is doing this.