Short answer to the riddle is: not enough demand to warrant investment (because you would need a long string of a few magnitudes bigger projects). Basically, th

Short answer to the riddle is: not enough demand to warrant investment (because you would need a long string of a few magnitudes bigger projects). Basically, the same structural problem that plagues nuclear power plant construction. All those fancy technological advancements did almost nothing to the typical housing construction, it's still a lot of manual work, a lot of specialized tasks (site prep, foundation, frame/structural stuff, roof, insulation, plumbing, sewage, wiring, HVAC, connecting utilities), a ton of waiting, lots of logistics. An enormous amount of babysitting (project management) of the builders, because everything is basically custom/one-off. https://www.construction-physics.com/p/which-construction-tasks-have-gotten https://www.construction-physics.com/p/which-construction-ta... cheaper https://www.construction-physics.com/p/why-are-there-so-few-economies-of https://www.construction-physics.com/p/why-are-there-so-few-... scale https://www.construction-physics.com/p/why-its-hard-to-innovate-in-construction https://www.construction-physics.com/p/why-its-hard-to-innov...