The entire process can take from 12 months to 18 months, depending on the scale of the project.  Photo 6 of 8 in Solar Arrays and Good Insulation Make These Prefab Residences Net-Zero—Even in Cold Climates

Solar Arrays and Good Insulation Make These Prefab Residences Net-Zero—Even in Cold Climates

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Homes are built in 12 to 18 months, depending on the scale of the project. ADUs typically come together more quickly.