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About Residential/Commercial Structures
"Closed construction" is a factory-built house, commercial structure,
or component that is not open for visible inspection at the building site.
It may enclose factory-installed structural, mechanical, electrical, plumbing,
or other systems and equipment.
"Commercial structure" is a structure designed or
used for human habitation (such as a dormitory) or human occupancy for industrial,
educational, assembly, professional, or commercial purposes. It may also include
a component.
"Factory-built housing" is housing designed
for human occupancy such as a single-family dwelling. The structure of
any room is entirely or substantially prefabricated or assembled at a
place other than a building site. It may also include a component. A factory-built
house is also referred to as a "modular" structure. Factory-built
housing does not include manufactured (mobile) housing. (See
RCW 43.22.450(3)).
NOTE: After occupancy of a factory-built residential/commercial structure,
all inspections are done by the local enforcement agency.
