Assuming public school--
Title II ADA requires schools to be accessible even if no renovations planned Deadline was January 26, 1995.
http://www.ada.gov/taman2.html
"II-5.6000 Time periods for achieving program accessibility. Public entities must achieve program accessibility by January 26, 1992. If structural changes are needed to achieve program accessibility, they must be made as expeditiously as possible, but in no event later than January 26, 1995. This three-year time period is not a grace period; all changes must be accomplished as expeditiously as possible. A public entity that employs 50 or more persons must develop a transition plan by July 26, 1992, setting forth the steps necessary to complete such changes. For guidance on transition plan requirements, see II-8.3000. "
"II-3.4200 Relationship to "program accessibility" requirement. The integrated setting requirement may conflict with the obligation to provide program accessibility, which may not necessarily mandate physical access to all parts of all facilities (see II-5.0000). Provision of services to individuals with disabilities in a different location, for example, is one method of achieving program accessibility. Public entities should make every effort to ensure that alternative methods of providing program access do not result in unnecessary segregation.
ILLUSTRATION: A school system should provide for wheelchair access at schools dispersed throughout its service area so that children who use wheelchairs can attend school at locations comparable in convenience to those available to other children. Also, where "magnet" schools, or schools offering different curricula or instruction techniques are available, the range of choice provided to students with disabilities must be comparable to that offered to other students.
II-5.1000 General. A public entity may not deny the benefits of its programs, activities, and services to individuals with disabilities because its facilities are inaccessible. A public entity's services, programs, or activities, when viewed in their entirety, must be readily accessible to and usable by individuals with disabilities. This standard, known as "program accessibility," applies to all existing facilities of a public entity. Public entities, however, are not necessarily required to make each of their existing facilities accessible.
ILLUSTRATION 1: When a city holds a public meeting in an existing building, it must provide ready access to, and use of, the meeting facilities to individuals with disabilities. The city is not required to make all areas in the building accessible, as long as the meeting room is accessible. Accessible telephones and bathrooms should also be provided where these services are available for use of meeting attendees.
ILLUSTRATION 2: D, a defendant in a civil suit, has a respiratory condition that prevents her from climbing steps. Civil suits are routinely heard in a courtroom on the second floor of the courthouse. The courthouse has no elevator or other means of access to the second floor. The public entity must relocate the proceedings to an accessible ground floor courtroom or take alternative steps, including moving the proceedings to another building, in order to allow D to participate in the civil suit.
ILLUSTRATION 3: A State provides ten rest areas approximately 50 miles apart along an interstate highway. Program accessibility requires that an accessible toilet room for each sex with at least one accessible stall, or a unisex bathroom, be provided at each rest area.
Is a public entity relieved of its obligation to make its programs accessible if no individual with a disability is known to live in a particular area? No. The absence of individuals with disabilities living in an area cannot be used as the test of whether programs and activities must be accessible.
ILLUSTRATION: A rural school district has only one elementary school and it is located in a one-room schoolhouse accessible only by steps. The school board asserts that there are no students in the district who use wheelchairs. Students, however, who currently do not have a disability may become individuals with disabilities through, for example, accidents or disease. In addition, persons other than students, such as parents and other school visitors, may be qualified individuals with disabilities who are entitled to participate in school programs. Consequently, the apparent lack of students with disabilities in a school district's service area does not excuse the school district from taking whatever appropriate steps are necessary to ensure that its programs, services, and activities are accessible to qualified individuals with disabilities. "
IBC 3411.7 exceptions would say nothing triggered by these renovations assuming the ceiling replacement is the result of the hvac and lighting work.
Primary function space renovations would say additional 20% for Accessibility improvements
