In developments where they build many identical houses, there is some re-use - the concrete forms used to build one slab are hauled down the block for the next

In developments where they build many identical houses, there is some re-use - the concrete forms used to build one slab are hauled down the block for the next one. Also, preformed wall framing is sometimes trucked in, as are roof trusses and other pieces. So there's still a lot of pre-built components that are used when building multiple houses.