Will design firms, residential designers, kitchen and bath, or retail/ furnishing establishments need to have a "registered interior design" professional on staff?

No, there is language excepting this situation. However, having a registered interior designer on staff would raise the level of quality to the services they offer and permit them to advertise that their services include those of a "registered interior designer." Otherwise, their designers may only refer to themselves as interior decorators, space planners or similar nomenclatures.

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