Discipline that focuses on the arrangement and layout of spaces and architectural elements inside architectural structures or parts of structures. For the discipline that focuses on the placement of moveable works located within the space, such as furniture or accessories, and often also on the design of the space itself, prefer "interior design." For the discipline focusing more on the flow of users of the space, building codes, etc., prefer "space planning."

Source: Art and Architect Thesaurus

http://vocab.getty.edu/page/aat/300395660