This is a favorite technique of ours... prefab at its best.
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1- Factory environment
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2 - Building is framed
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3- Rough finishes and utilities
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4- Interior is completed
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5- Home is wrapped and loaded
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6- Foundation built in advance
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7- Heavy crane arrives
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8- Modules are lifted
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9- Moved into position
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10- Mods land on foundation
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11- Additional mods are stacked
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12- Exterior elements are added
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13- Home is finished on site
The big boxes, set with the big cranes. It can be really fast, very predictable, and more environmentally sensitive than conventional site building.