Interior architecture is simply the design of the interior of a building or structure. Where as interior design deals with how pretty it is and architecture being the design of the overall structure and the exterior, a logical conclusion would be the structural design of the interior walls and/or style.
"Interior Architecture bridges the practices of interior design and architecture so that professionals working in the field have a structural and load bearing education with an emphasis on interior spaces. The field is similar to architecture in that it deals with structures and load bearing walls. It is similar to interior design in that it focuses on interior spaces."1
You cannot perform architecture jobs after only taking an
interior designing course. You would have to go to school for
architecture in order to do architecture.
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Alain Demachy has written:
'Interior architecture and decoration' -- subject(s): Interior
architecture, Interior decoration