It's sort of a blend. For many houses, the walls and roof trusses are delivered pre-built. Possibly even pre-wired, insulated, and drywalled. They are then stood up on site, and a moderate amount of connecting framing and finish work done by hand.

Labor and materials isn't the problem with housing costs. It's onerous permitting and zoning and code requirements.

Can you give me an example of a code requirement on a modern home that you think is wrong or onerous?