An interior designer plans the build out and decoration of interior spaces according to the usage requirements of those spaces. Not only is a designer responsible for creating the aesthetic appearance of the space but also ensuring that safety requirements are met and, of utmost importance, that functional requirements are met. While many interior designers are concerned primarily with color scheme, fabrics and textures, decoration and furnishings, there are those who work closely with architects on major projects.

Many people think of interior designers as working primarily on residential projects. But this is far from actuality because interior designers work on airport terminals, hospitals and medical facilities, office buildings, theaters and entertainment venues, schools and any other imaginable space. They can work for design firms, architectural firms, furniture or materials stores, or, as about 25% are, they can be self-employed. While the scope of any project can vary greatly, the typical design process includes a needs assessment with the client, an on-site space assessment, concept and plan development and a detailed cost assessment. Most designers are trained in computer-aided design (CAD).

At least 23 states require interior designers to be licensed. This requires a candidate to pass the licensing exam for which a candidate must first establish eligibility for testing. Typically a candidate must have a combination of 6 years of education and work experience in the field of interior design to sit for the exam. Education programs range from 2 year certificate programs to 4 year bachelor's programs. After completion of the formal education, a candidate works in an apprenticeship for 1 to 3 years before sitting for the exam.