When must structural changes be made to attain program accessibility?

Structural changes needed for program accessibility must be made as expeditiously as possible, and should have been made by January 26, 1995. A public entity that employs 50 or more persons must have developed a transition plan by July 26, 1992, setting forth the steps necessary to complete such changes.

For additional information, take a look at the following resource:

FAQ: What changes must a public entity make to its existing facilities to make them accessible?