What standards apply to newly constructed and altered facilities covered by the ADA?

Effective March 15, 2012, the applicable standards for new construction and alterations for either a public entity under Title II or a place of public accommodation under Title III are the 2010 ADA Standards for Accessible Design.   The 2010 ADA Standards can be found at: http://www.ada.gov/2010ADAstandards_index.htm

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

FAQ: Where can I find a complete set of ADA standards for accessible design?