IBC Section 101.2

International Building Code 101.2

Scope. The provisions of this code shall apply to the construction,
alteration, movement, enlargement, replacement,
repair, equipment, use and occupancy, location, maintenance,
removal and demolition of every building or structure or any
appurtenances connected or attached to such buildings or
structures.
Exception: Detached one- and two-family dwellings and
multiple single-family dwellings (townhouses) not more
than three stories above grade plane in height with a separate
means of egress and their accessory structures shall comply
with the International Residential Code.

Appendices. Provisions in the appendices shall not
apply unless specifically adopted.