i was reading and article the other week in residential developer mag about "affordable" prefab housing and tottered around the various websites of the builders.
boy, they were expensive! even taking into account less holding costs during build and less onsite time, they were still dearer than a straight build and much much more expensive than a mobile home.
there must be a market out there for reasonably priced, "mobile home" look, prefab mobile home that granny would enjoy.
Yea, they're no cheaper in my experience (otherwise I'd direct my clients to them). They still need to build it and transport it; probably takes less time to receive delivery of a pre-cut kit and have it erected on-site.