[jonny383]

Building houses on site is definitely slow and potentially a logistics nightmare between different trades people.

Prefab doesn't solve that one hundred percent, but I assume it would significantly increase build speed and predictions of completion date.

[andy_ppp]

Until you get to site and things don’t quite fit, then the installer bodges it or you wait 3 weeks for the factory to make a new bit. Making stuff on site isn’t as subject to disasters.