Become a Certified Interior Decorator

About C.I.D.

C.I.D. serves as a dual purpose certifying body and professional membership association exclusively for Certified Interior Decorators.

Founder, President, and renowned Interior Designer Ron Renner conceived the idea of certifying Interior Decorators for the first time in history. His purpose was to define the difference between Interior Designers and Interior Decorators and clarify the role of the professionally trained and tested Certified Interior Decorator.

The term “Certified Interior Decorator” and the appellation “C.I.D.” are registered trademarks filed in 1997 in the U.S. Patent and Trademark office in Washington, DC.

The use of C.I.D. is exclusively for current professional members of Certified Interior Decorators International (C.I.D.).

No other individual, organization,
college, or school
can “Certify” Interior Decorators.

Becoming a member of C.I.D. will increase your potential for acquiring clients and provide total access to the wholesale trade workrooms and furniture showrooms.

Certification Program

The C.I.D. Certification program was written by internationally recognized interior designer Ron Renner, ASID, to provide professional training and testing of Interior Decorators and was designed to allow the talented (novice or experienced) decorator to earn credentials for the purpose of pursuing a career as a “Certified Interior Decorator.”

The program is a complete Interior Decorating course with Certification. 

Our exclusive Certification program is taught in an easy, informative and concise manner through the use of ONLINE education or our Direct Workbook correspondence program. Teachings include: Function of Interior Spaces, History of Furniture, Trade Showrooms, Use of Color, Lighting, Scale and How to Charge for your services as a Certified Interior Decorator. C.I.D. is also the only organization that can educate, test, and certify Interior Decorators.

Certification Course Outline

  • Function of Space
  • Floor Planning
  • Furniture Placement
  • Elevations
  • History of Furniture and Architectural Styles
  • Custom Furniture and Cabinetry
  • Furniture Selection
  • Furniture Showrooms to the Trade
  • Color Trends
  • The Color Wheel
  • Color Terms
  • Psychology of Color
  • Regional Colors
  • Color Distribution
  • Wall Coverings and Finishes
  • Window Treatments
  • Bedspreads
  • Lighting
  • Flooring
  • Fabrics
  • Presentation Board
  • Pots and Plants
  • Artwork and Prints
  • Wall Groupings
  • Decorative Accessories
  • Consulting Basics
  • Compensation Methods
  • Business Startup
  • Decorator or Designer: The Difference
  • What an Interior Decorator Can Do
  • Avoiding Liabilities and Legal Problems
  • Being a Certified Interior Decorator

Both the ONLINE PROGRAM and the DIRECT MAIL WORKBOOK PROGRAM include the C.I.D. ENTRANCE EXAM and a free ONE YEAR C.I.D. PROFESSIONAL MEMBERSHIP ($295.00 value). Professional C.I.D. credentials will be sent upon successful completion of the Exam. Membership must be renewed annually to retain Certification. 


K.W., Boston, MA
"This is a wonderful program for someone who has talent for decorating but wants or needs to add the validity that becoming certified offers. The C.I.D. designation will open doors and lets consumers know you are a professional they can trust. So ... thank you, Mr. Renner."
S.W., Laguna Niguel, CA
"I have just finished the C.I.D. Certification Program .... It cleared up so much for me on exactly what I should be charging. I cannot thank you enough for this wonderful program."
Dallas Decorative Center, Dallas, TX
"Showrooms would be much more willing to work with a Certified Interior Decorator (C.I.D.)."