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Become NCIDQ Certified About the Exams Students Educators NCIDQ Certificate Holders Advocacy About CIDQ About CIDQ What is NCIDQ Interior Design Certification. NCIDQ Certification is the industry39s recognized indicator of proficiency in interior design principles and a designer39s commitment to the profession. The Value of NCIDQ Certification NCIDQ Certificate holders have proven their expertise in understanding and applying current codes established to protect public health safety and welfare. Passage of the NCIDQ Examination is required for interior design licensureregistration in every regulated jurisdiction within the United States and Canada with the exception of California.