Study for the IDEX Exam
Our class  is current with the 2025 California Building Codes

Register for our study class today


FAQ
(Frequently Asked Questions)
Updated June 20, 2026
 

Q. What codes are covered in the current IDEX exam and in your class?
A. The exams for 2026 through 2028 cover the 2025 California building code (which became effective on January 1, 2026). Our class lessons, quizzes and handouts are current with the  2025 California Building Code.

Q. What do past students say about your class?
A. They love it! Here are a few recent comments:

“I’m very happy and excited to have passed the IDEX exam! Yay !!!! Your class was incredibly helpful, and I truly appreciate the knowledge, guidance, and encouragement you provided along the way.Thank you”

“Thank you so much! Your class was super helpful. I am recommending it to my colleagues who are interested in testing!” 

“I PASSED THE IDEX! Your preparation course was invaluable!  I have no  idea how I would have studied or prepared without it! Thank you so, so  much!!!” 

Here are more
testimonials.

QDo I need to purchase all the reference books listed in CCIDC’s IDEX Study Guide?
A. No. Our class is very comprehensive. Unless you want the reference books for your design library, we believe our class is complete enough in order for you to pass the IDEX without going to the extra expense of purchasing the reference books.

QI previously failed the IDEX but didn’t take your class.
A. We offer a
25% rebate if you want to take our class.  If you took our class and did
not pass the exam,
see our policy page.

Q. What is your passage rate?
A.  
Please see our pass/fail chart.

QAre these live classes that meet at a specific time? Or, can I access on my own time?
A. Our class is not live, nor are there video lectures (which we feel can be distracting). When you enroll, you are given a classroom area that contains all the lessons and quizzes. You can take them in order, or you can skip around.  You can view the lessons and quizzes as many times as you like in the alotted class time. There is also a handout area where you have access to over 40 comprehensive handouts to view, print, or download.
PLEASE enroll in our no obligation demo class to see how the classroom and handout area work.

Q. Do I really need 75 days to complete your class?
A. No, not at all ...  but we are giving you a lot extra time in case you need it. Our class used to be offered for 60 days but some designers always asked for more time. Since everyone reads at a different pace, has different levels of education and work experience, plus a busy schedule, we are giving you the best prep course with a long access time to help you pass the exam. It is up to you, the student, to look through the materials and pace yourself according to your situation and lifestyle, so you can finish your class within the required timeframe.

Q. Will your class work on a PC, Mac, iPad, iPhone or Android tablet?
A. Yes, our class uses HTML 5 and has tested well on PC (Windows), Mac, desktop, laptop, tablets and phones (iOS and Android) with current web browsers. You will need access to a printer for many of our handouts.

Q. What are your requirements for taking your class? 
A. You need high-speed Internet access, a computer or mobile device with a Web browser, a printer, the ability to download and read Adobe .pdf files. Students should already have an interior design education and would benefit from having work experience in the interior design industry, both residential and commercial. Our classes are intended to prepare you to pass the IDEX exam for Certification in California. They are not intended to be complete building codes or interior design classes.

Q. Do I need to install a plug-in or extra software to take your classes?
A. No, but we recommend you first enroll in our one-day FREE demo class.  

Q. Is there anything else I need to know before enrolling?
A. Yes, we recommend you visit our
Terms and Policies page.

Q. Who is the original idex prep?
A.   We are the first. Launched in Sept. 2011, we are in our 15th year of offering this online class. We are not affiliated with the so-called “original idex prep” but despite what they claim and brag about, WE ARE the original and first online IDEXPREP class, the model on which they base themselves.  See our
blog post

Q. Why have you discontinued the  “IDEX Prep eGuide”?
A. Since we are now offering the highest quality IDEX Prep class in an easy-to-use framework, we have discontinued the IDEX Prep eGuide which we first published in 2009.

Q. I don’t live in California. Can I take your prep class to help me become a Certified Interior Designer?
A. Yes, you can take our IDEX Prep class from anywhere. If you want to take the IDEX EXAM however, you must first
apply for certification with CCIDC and meet their education, experience and requirements.

Q. Are CEUs available if I take your class?
A. Yes, but only for existing CIDs, and not IDEX candidates. Our class is accepted by
CCIDC for 1.0 unit of CEU credit for existing CIDs only. Note: 1.0 unit = equals 10 hours of class time.  SPECIAL OFFER TO CIDs who previously took our class. You are eligible for a 50% discount if you wish to take this class again for CEU credit. Contact us.

Q.What is your refund policy?
A.Please review our
Terms & Policies page.

Q. Who is the instructor of the IDEX Prep online class?
A. Deni Mosser is the author of the “IDEX Prep eGuide” and is the developer/instructor for this class. She is a Certified Interior Designer #0022 (1992) and an NCIDQ certificate holder #5865 (1986). Deni has over 30 years of experience as an interior designer and over 25 years of experience in Web design.
Read more here.

              
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IDEX®California is an exam  to become a CID (Certified Interior Designer). IDEX Prep is an authorized partner with IDEX® California and
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