Francis Vineyard said:
see section 102.6 and chapter 34 applicable on occupancy and accessibility when a permit would be required.
I think ALTER covers it........
SECTION 105 PERMITS
105.1 Required. Any owner or authorized agent who intends to construct, enlarge, alter, repair, move, demolish, or change the occupancy of a building or structure, or to erect, install, enlarge, alter, repair, remove, convert or replace any electrical, gas, mechanical or plumbing system, the installation of which is regulated by this code, or to cause any such work to be done, shall first make application to the building official and obtain the required permit.
102.6 Existing structures. The legal occupancy of any structure existing on the date of adoption of this code shall be permitted to continue WITHOUT CHANGE,.....
SECTION 114 VIOLATIONS
114.1 Unlawful acts. It shall be unlawful for any person, firm or corporation to erect, construct, alter, extend, repair, move, remove, demolish or occupy any building, structure or equipment regulated by this code, or cause same to be done, in conflict with or in violation of ANY of the provisions of this code.
2902.2 Separate facilities. Where plumbing fixtures are required, separate facilities shall be provided for each sex. [P]
1109.2 Toilet and bathing facilities. Each toilet room and bathing room shall be accessible. Where a floor level is not required to be connected by an accessible route, the only toilet rooms or bathing rooms provided within the facility shall not be located on the inaccessible floor. At least one of each type of fixture, element, control or dispenser in each accessible toilet room and bathing room shall be accessible.