Strictly speaking, interior architecture is a subject rather than a profession. The term ‘architect’ is protected (like ‘doctor’) and can’t be used by anyone without the specific qualifications and accreditation. Interior architecture as a term has come into use due to the increasing scope and responsibilities of interior designers – largely thanks to improvements in design technology (CAD) and interior design education. Many degree courses now teach students about the structural technical elements of buildings, which has begun to blur the line between architecture and interior design.
Whereas one may be more concerned with decor, soft furnishings and small scale projects, another may be more concerned with larger projects involving technical as well as artistic and aesthetic skills.