There is no longer wait than one where you are anticipating the results of a significant test or examination. Taking your interior design exam is no exception. The National Council for Interior Design Qualification (NCIDQ) administers your interior design exam. Once you have taken the test, you can expect to get your results within 14 weeks by mail. The NCIDQ allows for such a large time frame in order to go through the process of scanning the multiple-choice questions and analyzing the practical aspects of the exam.