The National Center for Education Statistics's definition of Interior Architecture: "A program that prepares individuals to apply architectural principles in the design of structural interiors for living, recreational, andbusiness purposes and to function as professional interior architects. Includes instruction in architecture, structural systems design, heating and cooling systems, occupational and safety standards, interior design, specific end-use applications, and professional responsibilities and standards." Interior Architecture stands at the intersection of architecture, design of the built environment, and conservation. The program addresses the design issues intrinsic to the re-use and transformation of existing structures through both an innovative and progressive approach.

However, a practicing professional cannot use the title of "Interior Architect" unless they complete the requirements for becoming a registered or licensed architect.

In mainland Europe (that is excluding the anglo-Saxon countries) the term "Interior Architecture" is generally used to describe what is defined in North America as "Interior Design" with a few exceptions. In many European countries the use of the title "Interior Architect" is legally regulated. For more information see ECIA