Interior designers and interior decorators are often mistaken for being the same thing; however, the terms are not interchangeable. It is important to understand the difference of each role when deciding whom to hire depending on whether you need assistance functionally or stylistically.
Interior designers are trained professionals who are skilled in spatial planning and understand the art of renovating interiors from drawing up initial floor plans to keeping the decorative aspect in mind. Education and experience allow an interior designer to provide a comfortable living environment. They often work closely with architects and contractors to achieve the look the client desires. (Ex: removing a wall or adding doors and windows).
Once a space has been renovated, an interior decorator can assist a client choose wallpaper, furniture and color schemes. Think aesthetics and style, not technical and structural. Interior decorators will also work with upholsterers and furniture designers.
Be sure to understand the look you desire before deciding which professional to hire.