[mihaaly]

Various levels of offsite construction (below the highway lane size limit components of course) exists for decades, in many contries, since at least the 60s, some died, some flourished. Of course this is still requiring considerable amount of onsite assembly and finishing off but still, manufacture component and delivery on trailers is a traditional concept already, the resons for less (as there are some) startups in construction need to be looked for elsewhere than onsite/offsite reasons.

Should you look at the fragmented composition of participating professions, fragmented nature of players and organizations involved, the fragmented and fluid supply chain, all combined with the long realization phase and complicated responsibility (legal) relationships of the actors perhaps? Generic contracting is more like a conductor role for the numerous groups involved, be it joined or independent ventures, than a subject of startup 'disruption'. Management, including financial.

Sub tasks will see some unicorns, but not much though, mostly in software area. The opensystemslab.io comes to mind as one construction adjacent one concerning the structral components mostly, but with systematic vision and novel mentality.