For a general guide to standards see: Standards. Standards relevant to architecture include:
Building codes set minimum standards for building construction or remodeling. Most cities and states base their codes on the publications of the International Code Council, which are generally published every three years. Most cities and states then add local codes of their own.
When building or remodeling in the City of Pittsburgh, see:
For the most recent international codes and related ASHRAE standards as well as many local Pennsylvania codes see: MADCAD.com.