3408.1 Conformance. Buildings or structures moved into or
within the jurisdiction shall comply with the provisions of
this code, the International Residential Code (chapter 51-51
WAC), the International Mechanical Code (chapter 51-52 WAC),
the International Fire Code (chapter 51-54 WAC), the Uniform
Plumbing Code and Standards (chapters 51-56 and 51-57 WAC),
the Washington State Energy Code (chapter 51-11 WAC) and the
Washington State Ventilation and Indoor Air Quality Code
(chapter 51-13 WAC) for new buildings or structures.
EXCEPTION:
Group R-3 buildings or structures are not required to comply if:
1. The original occupancy classification is not changed; and
2. The original building is not substantially remodeled or rehabilitated.
For the purposes of this section, a building shall be
considered to be substantially remodeled when the costs of
remodeling exceed 60 percent of the value of the building
exclusive of the costs relating to preparation, construction,
demolition or renovation of foundations.