Yes, you can make a building from pieces that were produced on an assembly line. But the vast majority of construction doesn't happen that way. And even those require labor to assemble.

My point was that the stationary robot arm you see putting cars together make sense in a factory setting, but that it wouldn't be so practical on a job site compared to something less specialized and more versatile.

Here's the summary for the wikipedia article you mentioned in your comment:

**Prefabricated homes, often referred to as prefab homes or simply prefabs, are specialist dwelling types of prefabricated building, which are manufactured off-site in advance, usually in standard sections that can be easily shipped and assembled. Some current prefab home designs include architectural details inspired by postmodernism or futurist architecture.

"Prefabricated" may refer to buildings built in components (e. g. panels), modules (modular homes) or transportable sections (manufactured homes), and may also be used to refer to mobile homes, i.**

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