100+ Free NCIDQ IDPX Practice Questions

The IDPX (Interior Design Professional Exam) tests professional practice and project administration across five 2026 blueprint content areas: Feasibility Studies (17%), Scheduling and Budgeting (17%), Contracts, Procurement, and Permitting (28%), Construction Process (21%), and Site Observation and Close-Out (17%). Topics include contract types and project delivery methods, bidding and procurement, FF&E purchasing, fee structures, building permits, submittals and change orders, payment certification, punch lists, substantial completion, and close-out documentation. The heaviest weighting is on contracts, procurement, and permitting at 28%.

The IDPX is a computer-based exam with approximately 115 questions, including roughly 15 unscored pretest items, delivered in a 3-hour session. Questions are multiple-choice and alternative item types. It is administered by CIDQ at Prometric test centers or through remote ProProctor delivery. The IDPX is one of three required NCIDQ sections and may be taken in any order relative to IDFX and IDIX.

CIDQ uses scaled scoring on a 200-800 scale, and a scaled score of 500 is required to pass the IDPX. Scaled scoring accounts for slight differences in difficulty between exam forms, so the number of questions you must answer correctly can vary slightly between administrations. Your result is reported as pass or fail along with a scaled score and content-area feedback.

The IDPX is considered challenging because it tests business, legal, and project-administration knowledge that interior designers may use less frequently in daily practice than design skills. The CIDQ Fall 2025 IDPX section pass rate was approximately 65 percent. Candidates with hands-on experience in contracts, procurement, and construction administration tend to perform better. Most candidates study roughly 70 to 90 hours, concentrating on the heavily weighted contracts, procurement, and permitting area.

The three NCIDQ sections, IDFX, IDPX, and IDIX, are independent and can be taken in any order. Many candidates take IDFX first because it covers foundational knowledge from their education, then take IDPX once they have professional experience with contracts and construction administration. If your current work involves project management, procurement, or contract administration, you may be well prepared to take the IDPX earlier.

Use the CIDQ exam blueprint and reference list as your primary guide, and study professional-practice resources covering contracts, procurement, fees, project delivery methods, and construction administration. Helpful references include AIA contract documents such as B101 and the FF&E-specific A251, the CSI MasterFormat for specifications, and texts on interior design professional practice and project management. Practicing with timed questions on feasibility, contracts, scheduling, and close-out helps build exam stamina and recall.

IDFX (Interior Design Fundamentals Exam) tests foundational and early-phase design knowledge. IDPX (Interior Design Professional Exam) tests professional practice and project administration, including feasibility, contracts, procurement, permitting, the construction process, and close-out. IDIX (Interior Design Implementation Exam), which replaced the former PRAC beginning April 2026, tests implementation-phase content such as construction documents, codes and life safety, and consultant coordination. All three must be passed for NCIDQ certification.